1.
Geographic coordinate system
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A geographic coordinate system is a coordinate system used in geography that enables every location on Earth to be specified by a set of numbers, letters or symbols. The coordinates are chosen such that one of the numbers represents a vertical position. A common choice of coordinates is latitude, longitude and elevation, to specify a location on a two-dimensional map requires a map projection. The invention of a coordinate system is generally credited to Eratosthenes of Cyrene. Ptolemy credited him with the adoption of longitude and latitude. Ptolemys 2nd-century Geography used the prime meridian but measured latitude from the equator instead. Mathematical cartography resumed in Europe following Maximus Planudes recovery of Ptolemys text a little before 1300, in 1884, the United States hosted the International Meridian Conference, attended by representatives from twenty-five nations. Twenty-two of them agreed to adopt the longitude of the Royal Observatory in Greenwich, the Dominican Republic voted against the motion, while France and Brazil abstained. France adopted Greenwich Mean Time in place of local determinations by the Paris Observatory in 1911, the latitude of a point on Earths surface is the angle between the equatorial plane and the straight line that passes through that point and through the center of the Earth. Lines joining points of the same latitude trace circles on the surface of Earth called parallels, as they are parallel to the equator, the north pole is 90° N, the south pole is 90° S. The 0° parallel of latitude is designated the equator, the plane of all geographic coordinate systems. The equator divides the globe into Northern and Southern Hemispheres, the longitude of a point on Earths surface is the angle east or west of a reference meridian to another meridian that passes through that point. All meridians are halves of great ellipses, which converge at the north and south poles, the prime meridian determines the proper Eastern and Western Hemispheres, although maps often divide these hemispheres further west in order to keep the Old World on a single side. The antipodal meridian of Greenwich is both 180°W and 180°E, the combination of these two components specifies the position of any location on the surface of Earth, without consideration of altitude or depth. The grid formed by lines of latitude and longitude is known as a graticule, the origin/zero point of this system is located in the Gulf of Guinea about 625 km south of Tema, Ghana. To completely specify a location of a feature on, in, or above Earth. Earth is not a sphere, but a shape approximating a biaxial ellipsoid. It is nearly spherical, but has an equatorial bulge making the radius at the equator about 0. 3% larger than the radius measured through the poles, the shorter axis approximately coincides with the axis of rotation
2.
Persian language
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Persian, also known by its endonym Farsi, is one of the Western Iranian languages within the Indo-Iranian branch of the Indo-European language family. It is primarily spoken in Iran, Afghanistan, and Tajikistan and it is mostly written in the Persian alphabet, a modified variant of the Arabic script. Its grammar is similar to that of many contemporary European languages, Persian gets its name from its origin at the capital of the Achaemenid Empire, Persis, hence the name Persian. A Persian-speaking person may be referred to as Persophone, there are approximately 110 million Persian speakers worldwide, with the language holding official status in Iran, Afghanistan, and Tajikistan. For centuries, Persian has also been a cultural language in other regions of Western Asia, Central Asia. It also exerted influence on Arabic, particularly Bahrani Arabic. Persian is one of the Western Iranian languages within the Indo-European family, other Western Iranian languages are the Kurdish languages, Gilaki, Mazanderani, Talysh, and Balochi. Persian is classified as a member of the Southwestern subgroup within Western Iranian along with Lari, Kumzari, in Persian, the language is known by several names, Western Persian, Parsi or Farsi has been the name used by all native speakers until the 20th century. Since the latter decades of the 20th century, for reasons, in English. Tajiki is the variety of Persian spoken in Tajikistan and Uzbekistan by the Tajiks, according to the Oxford English Dictionary, the term Persian as a language name is first attested in English in the mid-16th century. Native Iranian Persian speakers call it Fārsi, Farsi is the Arabicized form of Pārsi, subsequent to Muslim conquest of Persia, due to a lack of the phoneme /p/ in Standard Arabic. The origin of the name Farsi and the place of origin of the language which is Fars Province is the Arabicized form of Pārs, in English, this language has historically been known as Persian, though Farsi has also gained some currency. Farsi is encountered in some literature as a name for the language. In modern English the word Farsi refers to the language while Parsi describes Zoroastrians, some Persian language scholars such as Ehsan Yarshater, editor of Encyclopædia Iranica, and University of Arizona professor Kamran Talattof, have also rejected the usage of Farsi in their articles. The international language-encoding standard ISO 639-1 uses the code fa, as its system is mostly based on the local names. The more detailed standard ISO 639-3 uses the name Persian for the dialect continuum spoken across Iran and Afghanistan and this consists of the individual languages Dari and Iranian Persian. Currently, Voice of America, BBC World Service, Deutsche Welle, Radio Free Europe/Radio Liberty also includes a Tajik service and an Afghan service. This is also the case for the American Association of Teachers of Persian, The Centre for Promotion of Persian Language and Literature, Persian is an Iranian language belonging to the Indo-Iranian branch of the Indo-European family of languages
3.
Mountain range
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A mountain range is a geographic area containing numerous geologically related mountains. A mountain system or system of ranges, sometimes is used to combine several geological features that are geographically related. Mountain ranges are usually segmented by highlands or mountain passes and valleys, individual mountains within the same mountain range do not necessarily have the same geologic structure or petrology. They may be a mix of different orogenic expressions and terranes, for example thrust sheets, uplifted blocks, fold mountains, most geologically young mountain ranges on the Earths land surface are associated with either the Pacific Ring of Fire or the Alpide Belt. The Andes is 7,000 kilometres long and is considered the worlds longest mountain system. The Alpide belt includes Indonesia and southeast Asia, through the Himalaya, the belt also includes other European and Asian mountain ranges. The Himalayas contain the highest mountains in the world, including Mount Everest, mountain ranges outside of these two systems include the Arctic Cordillera, the Urals, the Appalachians, the Scandinavian Mountains, the Altai Mountains and the Hijaz Mountains. If the definition of a range is stretched to include underwater mountains. The mountain systems of the earth are characterized by a tree structure, the sub-range relationship is often expressed as a parent-child relationship. For example, the White Mountains of New Hampshire and the Blue Ridge Mountains are sub-ranges of the Appalachian Mountains, equivalently, the Appalachians are the parent of the White Mountains and Blue Ridge Mountains, and the White Mountains and the Blue Ridge Mountains are children of the Appalachians. The position of mountains influences climate, such as rain or snow, when air masses move up and over mountains, the air cools producing orographic precipitation. As the air descends on the side, it warms again and is drier. Often, a shadow will affect the leeward side of a range. Mountain ranges are constantly subjected to forces which work to tear them down. Erosion is at work while the mountains are being uplifted and long after until the mountains are reduced to low hills, rivers are traditionally believed to be the principle erosive factor on mountain ranges, with their ability of bedrock incision and sediment transport. The rugged topography of a range is the product of erosion. The basins adjacent to a mountain range are filled with sediments which are buried and turned into sedimentary rock. The early Cenozoic uplift of the Rocky Mountains of Colorado provides an example and this mass of rock was removed as the range was actively undergoing uplift
4.
Iran
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Iran, also known as Persia, officially the Islamic Republic of Iran, is a sovereign state in Western Asia. Comprising a land area of 1,648,195 km2, it is the second-largest country in the Middle East, with 82.8 million inhabitants, Iran is the worlds 17th-most-populous country. It is the country with both a Caspian Sea and an Indian Ocean coastline. The countrys central location in Eurasia and Western Asia, and its proximity to the Strait of Hormuz, Tehran is the countrys capital and largest city, as well as its leading economic and cultural center. Iran is the site of to one of the worlds oldest civilizations, the area was first unified by the Iranian Medes in 625 BC, who became the dominant cultural and political power in the region. The empire collapsed in 330 BC following the conquests of Alexander the Great, under the Sassanid Dynasty, Iran again became one of the leading powers in the world for the next four centuries. Beginning in 633 AD, Arabs conquered Iran and largely displaced the indigenous faiths of Manichaeism and Zoroastrianism by Islam, Iran became a major contributor to the Islamic Golden Age that followed, producing many influential scientists, scholars, artists, and thinkers. During the 18th century, Iran reached its greatest territorial extent since the Sassanid Empire, through the late 18th and 19th centuries, a series of conflicts with Russia led to significant territorial losses and the erosion of sovereignty. Popular unrest culminated in the Persian Constitutional Revolution of 1906, which established a monarchy and the countrys first legislative body. Following a coup instigated by the U. K. Growing dissent against foreign influence and political repression led to the 1979 Revolution, Irans rich cultural legacy is reflected in part by its 21 UNESCO World Heritage Sites, the third-largest number in Asia and 11th-largest in the world. Iran is a member of the UN, ECO, NAM, OIC. Its political system is based on the 1979 Constitution which combines elements of a democracy with a theocracy governed by Islamic jurists under the concept of a Supreme Leadership. A multicultural country comprising numerous ethnic and linguistic groups, most inhabitants are Shia Muslims, the largest ethnic groups in Iran are the Persians, Azeris, Kurds and Lurs. Historically, Iran has been referred to as Persia by the West, due mainly to the writings of Greek historians who called Iran Persis, meaning land of the Persians. As the most extensive interactions the Ancient Greeks had with any outsider was with the Persians, however, Persis was originally referred to a region settled by Persians in the west shore of Lake Urmia, in the 9th century BC. The settlement was then shifted to the end of the Zagros Mountains. In 1935, Reza Shah requested the international community to refer to the country by its native name, opposition to the name change led to the reversal of the decision, and Professor Ehsan Yarshater, editor of Encyclopædia Iranica, propagated a move to use Persia and Iran interchangeably
5.
Azerbaijan
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Azerbaijan, officially the Republic of Azerbaijan, is a country in the South Caucasus region, situated at the crossroads of Southwest Asia and Southeastern Europe. It is bound by the Caspian Sea to the east, Russia to the north, Georgia to the northwest, Armenia to the west and Iran to the south. The exclave of Nakhchivan is bound by Armenia to the north and east, Iran to the south and west, the Azerbaijan Democratic Republic proclaimed its independence in 1918 and became the first democratic state in the Muslim orient world. The country was incorporated into the Soviet Union in 1920 as the Azerbaijan Soviet Socialist Republic, the modern Republic of Azerbaijan proclaimed its independence on 30 August 1991, prior to the official dissolution of the USSR in December 1991. In September 1991, the Armenian majority of the disputed Nagorno-Karabakh region seceded to form the Nagorno-Karabakh Republic, the region and seven adjacent districts outside it became de facto independent with the end of the Nagorno-Karabakh War in 1994. These regions are recognized as part of Azerbaijan pending a solution to the status of the Nagorno-Karabakh. Azerbaijan is a unitary semi-presidential republic, the country is a member state of the Council of Europe, the OSCE and the NATO Partnership for Peace program. It is one of six independent Turkic states, a member of the Turkic Council. Azerbaijan has diplomatic relations with 158 countries and holds membership in 38 international organizations and it is one of the founding members of GUAM, the Commonwealth of Independent States and the Organization for the Prohibition of Chemical Weapons. Its term of office began on 19 June 2006, Azerbaijan is also a member state of the Non-Aligned Movement, holds observer status in World Trade Organization and is a correspondent at the International Telecommunication Union. The Constitution of Azerbaijan does not declare an official religion and all political forces in the country are secularist. However, the majority of the population are of a Shiite Muslim background, Azerbaijan has a high level of human development which ranks on par with most Eastern European countries. It has a rate of economic development and literacy, as well as a low rate of unemployment. According to the Davos World Economic Forum, Azerbaijans economy has scored 37th place within 138 countries in 2016, Global Competitiveness Index 2015 indicates that Azerbaijan scores highest in its region. ASAN services, established with Presidential Decree, are known for eliminating bribery. ASAN Service has been awarded with United Nations Public Service Award 2015, the ruling party, the New Azerbaijan Party, has been accused of authoritarianism and human rights abuses. The original etymology of name is thought to have its roots in the once-dominant Zoroastrianism. In the Avesta, Frawardin Yasht, there is a mention of âterepâtahe ashaonô fravashîm ýazamaide, the name Atropates itself is the Greek transliteration of an Old Iranian, probably Median, compounded name with the meaning Protected by the Fire or The Land of the Fire
6.
Caspian Sea
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The Caspian Sea is the largest enclosed inland body of water on Earth by area, variously classed as the worlds largest lake or a full-fledged sea. It is in a basin located between Europe and Asia. It is bounded by Kazakhstan to the northeast, Russia to the northwest, Azerbaijan to the west, Iran to the south, the Caspian Sea lies to the east of the Caucasus Mountains and to the west of the vast steppe of Central Asia. In its northern part, the Caspian Depression lies 28 to 130 m below sea level, the sea bed in the southern part reaches as low as 1023 m below sea level, which is the second lowest natural depression on earth after Lake Baikal. The ancient inhabitants of its coast perceived the Caspian Sea as an ocean, probably because of its saltiness, the sea has a surface area of 371,000 km2 and a volume of 78,200 km3. It has a salinity of approximately 1. 2%, about a third of the salinity of most seawater, the word Caspian is derived from the name of the Caspi, an ancient people who lived to the southwest of the sea in Transcaucasia. Strabo wrote that to the country of the Albanians belongs also the territory called Caspiane, which was named after the Caspian tribe, as was also the sea, but the tribe has now disappeared. Moreover, the Caspian Gates, which is the name of a region in Irans Tehran province, the Iranian city of Qazvin shares the root of its name with that of the sea. In fact, the traditional Arabic name for the sea itself is Bahr al-Qazwin, in classical antiquity among Greeks and Persians it was called the Hyrcanian Ocean. In Persian antiquity, as well as in modern Iran, it is known as the دریای خزر, Daryā-e Khazar, ancient Arabic sources refer to it as Baḥr Gīlān meaning the Gilan Sea. Turkic languages refer to the lake as Khazar Sea, in Turkmen, the name is Hazar deňizi, in Azeri, it is Xəzər dənizi, and in modern Turkish, it is Hazar denizi. An exception is Kazakh, where it is called Каспий теңізі, old Russian sources call it the Khvalyn or Khvalis Sea after the name of Khwarezmia. In modern Russian, it is called Каспи́йское мо́ре, Kaspiyskoye more, the Caspian Sea, like the Black Sea, Namak Lake, and Lake Urmia, is a remnant of the ancient Paratethys Sea. It became landlocked about 5.5 million years ago due to tectonic uplift and a fall in sea level. Due to the current inflow of water, the Caspian Sea is a freshwater lake in its northern portions, and is most saline on the Iranian shore. Currently, the salinity of the Caspian is one third that of Earths oceans. The Caspian Sea is the largest inland body of water in the world, the coastlines of the Caspian are shared by Azerbaijan, Iran, Kazakhstan, Russia, and Turkmenistan. The Caspian is divided into three distinct regions, the Northern, Middle, and Southern Caspian
7.
Greater Khorasan
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Khorasan is a historical region lying in the northeast of Persia. Khorasan in its proper sense comprised principally the cities of Balkh and Herat, Mashhad and Nishapur, Merv and Nisa, and Bukhara and Samarkand. Some believe that at certain times Khorasan covered an area, which included parts of Transoxiana, Soghdiana, Sistan. Sources from the 14th to the 16th century report that areas in the south of the Hindu Kush mountain range formed a frontier between Khorasan and Hindustan, in the Islamic period, Persian Iraq and Khorasan were the two important territories. The boundary between these two was the surrounding the cities of Gurgan and Qumis. In particular, the Ghaznavids, Seljuqs, and Timurids divided their empires into Iraqi, the adjective Greater is added these days to distinguish the historical region from the Khorasan Province of Iran, which roughly encompassed the western half of the historical Greater Khorasan. The name Khorāsān is derived from Middle Persian Khwarāsān, a compound of khwar, thus the name Khorasan means land where the sun rises or east. The Persian word Khāvar-zamīn, meaning the land, has also been used as an equivalent term. First established as an entity by the Sassanids, the borders of the region have varied considerably during its 1. Initially the Khorasan province of Sassanid empire included the cities of Nishapur, Herat, Merv, Faryab, Taloqan, Balkh, Bukhara, Badghis, Abiward, Gharjistan, Tus or Susia, Sarakhs and Gurgan. It acquired its greatest extent under the Caliphs, for whom Khorasan was the name of one of the three political zones under their dominion. Under the Umayyad and Abbasid caliphates, Khorasan was divided into four sections or quarters, each section based on a single major city, Nishapur, Merv, Herat. In the Middle Ages, the term was applied in Persia to all its territories that lay east and north east of Dasht-e Kavir. Ghobar uses the terms Proper Khorasan and Improper Khorasan in his book to distinguish between the usage of Khorasan in its sense and its usage in a loose sense. Improper Khorasans boundaries extended to as far as Hazarajat and Kabul in the east, Sistan and Baluchistan in the south, Transoxiana and Khwarezm in the north, and Damghan and Gorgan in the west. It is mentioned in the Memoirs of Babur that, The people of Hindustān call every country beyond their own Khorasān, in the manner as the Arabs term all except Arabia. On the road between Hindustān and Khorasān, there are two great marts, the one Kābul, the other Kandahār. Caravans, from Ferghāna, Tūrkestān, Samarkand, Balkh, Bokhāra, Hissār and this country lies between Hindustān and Khorasān
8.
Avesta
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The Avesta /əˈvɛstə/ is the primary collection of religious texts of Zoroastrianism, composed in the otherwise unrecorded Avestan language. The Avesta texts fall into different categories, arranged either by dialect. The principal text in the group is the Yasna, which takes its name from the Yasna ceremony, Zoroastrianisms primary act of worship. The most important portion of the Yasna texts are the five Gathas and these hymns, together with five other short Old Avestan texts that are also part of the Yasna, are in the Old Avestan language. The remainder of the Yasnas texts are in Younger Avestan, which is not only from a stage of the language. Extensions to the Yasna ceremony include the texts of the Vendidad, the Visperad extensions consist mainly of additional invocations of the divinities, while the Vendidad is a mixed collection of prose texts mostly dealing with purity laws. Even today, the Vendidad is the liturgical text that is not recited entirely from memory. Some of the materials of the extended Yasna are from the Yashts, unlike the Yasna, Visperad and Vendidad, the Yashts and the other lesser texts of the Avesta are no longer used liturgically in high rituals. Aside from the Yashts, these lesser texts include the Nyayesh texts, the Gah texts, the Siroza. Together, these texts are conventionally called Khordeh Avesta or Little Avesta texts. When the first Khordeh Avesta editions were printed in the 19th century, the term Avesta is from the 9th/10th-century works of Zoroastrian tradition in which the word appears as Zoroastrian Middle Persian abestāg, Book Pahlavi ʾpstʾkʼ. In that context, abestāg texts are portrayed as received knowledge, the literal meaning of the word abestāg is uncertain, it is generally acknowledged to be a learned borrowing from Avestan, but none of the suggested etymologies have been universally accepted. The surviving texts of the Avesta, as they exist today and that master copy, now lost, is known as the Sassanian archetype. The oldest surviving manuscript of an Avestan language text is dated 1323 CE, summaries of the various Avesta texts found in the 9th/10th century texts of Zoroastrian tradition suggest that about three-quarters of the corpus has since been lost. A pre-Sasanian history of the Avesta, if it had one, is in the realm of legend, the oldest surviving versions of these tales are found in the ninth to 11th century texts of Zoroastrian tradition. The legends run as follows, The twenty-one nasks of the Avesta were created by Ahura Mazda, supposedly, Vishtaspa or another Kayanian, Daray, then had two copies made, one of which was stored in the treasury, and the other in the royal archives. Following Alexanders conquest, the Avesta was then supposedly destroyed or dispersed by the Greeks after they translated the scientific passages that they could make use of, the Denkard also transmits another legend related to the transmission of the Avesta. In that story, credit for collation and recension is given to the early Sasanian-era priest Tansar, who had the works collected
9.
Mount Elbrus
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Mount Elbrus is the highest mountain in Russia and in Europe, and the tenth most prominent peak in the world. A dormant volcano, Elbrus forms part of the Caucasus Mountains in Southern Russia, Elbrus has two summits, both of which are dormant volcanic domes. With its slightly taller west summit, the stands at 5,642 metres. Crauford Grove and including Frederick Gardner, Horace Walker, and the Swiss guide Peter Knubel of St. Niklaus, the name Elbrus /ˈɛlbrəs/ is a metathesis of Alborz, which is also the name of a long mountain range in northern Iran. It is derived from Avestan Harā Bərəzaitī, which is a mountain in Iranian mythology. Harā Bərəzaitī reflects Proto-Iranian *Harā Bṛzatī, which was reformed into Middle Persian as Harborz, Bṛzatī is the feminine form of the adjective *bṛzant, the reconstructed ancestor of Modern Persian barz, berāzande, and boland, and Modern Kurdish barz. Harā may be interpreted as watch or guard, from Indo-European *ser, Elbrus stands 20 km north of the main range of the Greater Caucasus and 65 km south-southwest of the Russian town of Kislovodsk. Its permanent icecap feeds 22 glaciers, which in turn give rise to the Baksan, Kuban, Elbrus sits on a moving tectonic area, and has been linked to a fault. A supply of magma lies deep beneath the dormant volcano, Mount Elbrus was formed more than 2.5 million years ago. The volcano is considered inactive. Elbrus was active in the Holocene, and according to the Global Volcanism Program, evidence of recent volcanism includes several lava flows on the mountain, which look fresh, and roughly 260 square kilometres of volcanic debris. The longest flow extends 24 kilometres down the northeast summit, indicative of a large eruption, there are other signs of activity on the volcano, including solfataric activity and hot springs. The western summit has a volcanic crater about 250 metres in diameter. Myth held that here Zeus had chained Prometheus, the Titan who had stolen fire from the gods, crauford Grove and including Frederick Gardner, Horace Walker, and the Swiss guide Peter Knubel of St. Niklaus in the canton Valais. During the early years of the Soviet Union, mountaineering became a sport of the populace. On 17 March 1936, a group of 33 inexperienced Komsomol members attempted the mountain, during the Battle of the Caucasus in World War II, the Wehrmacht occupied the area surrounding the mountain from August 1942 to January 1943 with 10,000 Gebirgsjäger from the 1st Mountain Division. A possibly apocryphal story tells of a Soviet pilot being given a medal for bombing the main mountaineering hut, Priyut 11 and he was then later nominated for a medal for not hitting the hut, but instead the German fuel supply, leaving the hut standing for future generations. From 1959 through 1976, a cable car system was built in stages that can take visitors as high as 3,800 metres
10.
Zoroastrianism
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Ascribed to the teachings of the Iranian prophet Zoroaster, it exalts a deity of wisdom, Ahura Mazda, as its Supreme Being. Zoroastrianism was suppressed from the 7th century onwards following the Muslim conquest of Persia of 633-654, recent estimates place the current number of Zoroastrians at around 2.6 million, with most living in India and in Iran. Besides the Zoroastrian diaspora, the older Mithraic faith Yazdânism is still practised amongst Kurds, the religious philosophy of Zoroaster divided the early Iranian gods of Proto-Indo-Iranian tradition. The most important texts of the religion are those of the Avesta, in Zoroastrianism, the creator Ahura Mazda, through the Spenta Mainyu is an all-good father of Asha, in opposition to Druj and no evil originates from him. He and his works are evident to humanity through the six primary Amesha Spentas, Spenta Mainyu adjoined unto truth oppose the Spirits opposite, Angra Mainyu and its forces born of Akəm Manah. In Zoroastrianism, the purpose in life is to be among those who renew the world. to make the progress towards perfection. Its basic maxims include, Humata, Hukhta, Huvarshta, which mean, Good Thoughts, Good Words, there is only one path and that is the path of Truth. Do the right thing because it is the thing to do. The full name by which Zoroaster addressed the deity is, Ahura, The Lord Creator and he proclaimed that there is only one God, the singularly creative and sustaining force of the Universe. He also stated that human beings are given a right of choice, Zoroasters teachings focused on responsibility, and did not introduce a devil per se. The contesting force to Ahura Mazda was called Angra Mainyu, or angry spirit, post-Zoroastrian scripture introduced the concept of Ahriman, the Devil, which was effectively a personification of Angra Mainyu. The name Zoroaster is a Greek rendering of the name Zarathustra and he is known as Zartosht and Zardosht in Persian and Zaratosht in Gujarati. The Zoroastrian name of the religion is Mazdayasna, which combines Mazda- with the Avestan language word yasna, meaning worship, in English, an adherent of the faith is commonly called a Zoroastrian or a Zarathustrian. An older expression still used today is Behdin, meaning The best Religion | Beh < Middle Persian Weh + Din < Middle Persian dēn < Avestan Daēnā. In Zoroastrian liturgy the term is used as a title for an individual who has formally inducted into the religion in a Navjote ceremony. The term Mazdaism /ˈmæzdə. ɪzəm/ is a typical 19th century construct, taking Mazda- from the name Ahura Mazda, the March 2001 draft edition of the Oxford English Dictionary also records an alternate form, Mazdeism, perhaps derived from the French Mazdéisme, which first appeared in 1871. In older English sources, the terms Gheber and Gueber were used to refer to Zoroastrians, however, Zoroastrian philosophy is identified as having been known to Italian Renaissance Europe through an image of Zoroaster in Raphaels School of Athens by Giorgio Vasari in 1550. The Oxford English Dictionary records use of the term Zoroastrianism in 1874 in Archibald Sayces Principles of Comparative Philology, Zoroastrians believe that there is one universal, transcendent, supreme god, Ahura Mazda, or the Wise Lord
11.
Peshyotan
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Peshotanu is an eschatological figure of the medieval texts of Zoroastrian tradition, in particular in the apocalyptic Zand-i Wahman yasn. In these texts, Peshotanu is an assistant of the Saoshyant, in the genealogy of the mythical Kayanians, Peshotanu is the youngest son of Vishtaspa, and brother of Spentodata. At the fort, Peshotanu and Hvarchithra, respectively the younger sons of Vishtaspa and Zoroaster, together with their righteous army, await the final battle against Ahriman and this description appears in Bundahishn XXXIII, Denkard VII and IX, and in Zand-i Wahman yasn VII. In Denkard IX, this information is attributed to the lost Sudgar Nask, the principal source of information on the figure is the apocalyptic Zand-i Wahman yasn. The Zand-i Wahman yasn is an account of what was to happen to the Zoroastrians. In the second half of that text, Peshotan is described as a protector of the religion, until that revival – which supposedly will come when the daevas will have exceeded their term of rule by 1,000 years – Peshotanu remains at Khandez with 150 of his disciples. Thereafter, so the tale, Peshotanu will come down to battle the armies of the demons and restore Iran, in the fight, Mihr will intervene on Peshotanus behalf, and together they will drive the demon Kheshm and his forces back into the underworld
12.
Shahnameh
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The Shahnameh, also transliterated as Shahnama, is a long epic poem written by the Persian poet Ferdowsi between c.977 and 1010 CE and is the national epic of Greater Iran. Consisting of some 50,000 distichs or couplets, the Shahnameh is the worlds longest epic poem written by a single poet. It tells mainly the mythical and to some extent the historical past of the Persian Empire from the creation of the world until the Islamic conquest of Persia in the 7th century. Modern Iran, Azerbaijan, Afghanistan and the region influenced by the Persian culture celebrate this national epic. The work is of importance in Persian culture, regarded as a literary masterpiece. Ferdowsi started writing the Shahnameh in 977 A. D and completed it on 8 March 1010, the Shahnameh is a monument of poetry and historiography, being mainly the poetical recast of what Ferdowsi, his contemporaries, and his predecessors regarded as the account of Irans ancient history. Many such accounts already existed in prose, an example being the Abu-Mansuri Shahnameh, a small portion of Ferdowsis work, in passages scattered throughout the Shahnameh, is entirely of his own conception. The Shahnameh is a poem of over 50,000 couplets. It is based mainly on a work of the same name compiled in Ferdowsis earlier life in his native Tus. The Xwadāynāmag contained historical information on the later Sassanid period, Ferdowsi added material continuing the story to the overthrow of the Sassanids by the Arabs in the middle of the 7th century. These verses, which deal with the rise of the prophet Zoroaster, were incorporated by Ferdowsi, with acknowledgment. The style of the Shahnameh shows characteristics of written and oral literature. Some claim that Ferdowsi also used Zoroastrian nasks, such as the now-lost Chihrdad, besides, the text is written in the late Middle Persian, which was the immediate ancestor of Modern Persian. According to one account of the sources, a Persian named Dehqan in the court of King Anushehrawan Dadgar had composed a book in prose form. After the fall of the Iranian Empire, Khoday Nameh came into the possession of King Yaqub Lais and then the Samani king Nuh ordered the poet Daqiqi to complete it, Ferdowsi obtained the book through a friend. The work is not precisely chronological, but there is a movement through time. Some of the characters live for hundreds of years but most have normal life spans, there are many shāhs who come and go, as well as heroes and villains, who also come and go. The only lasting images are those of Greater Persia itself, and of a succession of sunrises and sunsets, the work is divided into three successive parts, the mythical, heroic, and historical ages
13.
Ferdowsi
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Abu ʾl-Qasim Ferdowsi Tusi, or Ferdowsi was a Persian poet and the author of Shahnameh, which is the worlds longest epic poem created by a single poet, and the national epic of Greater Iran. Ferdowsi is celebrated as the most influential figure in Persian literature and he was called The Lord of the Word and The Savior of Persian Language. Except for his kunya and his laqab, nothing is known with any certainty about his full name, from an early period on, he has been referred to by different additional names and titles, the most common one being حکیم / Ḥakīm. Based on this, his name is given in Persian sources as حکیم ابوالقاسم فردوسی توسی / Ḥakīm Abul-Qāsim Firdowsī Țusī. Due to the transliteration from Persian into English, different spellings of his name are used in English works, including Firdawsi, Firdusi, Firdosi, Firdausi. The Encyclopaedia of Islam uses the spelling Firdawsī, based on the transliteration method of the German Oriental Society. The Encyclopædia Iranica, which uses a version of the same method. In both cases, the -ow and -aw are to be pronounced as a diphthong, reflecting the original Arabic, the modern Tajik transliteration of his name in Cyrillic script is Ҳаким Абулқосим Фирдавсӣ Тӯсӣ. Little is known about Ferdowsis early life, the poet had a wife, who was probably literate and came from the same dehqan class. He had a son, who died aged 37, and was mourned by the poet in an elegy which he inserted into the Shahnameh, Ferdowsi belonged to the class of dehqans. The dehqans were intensely patriotic and saw it as their task to preserve the traditions of Iran. By the late 9th century, the power of the caliphate had weakened, Ferdowsi grew up in Tus, a city under the control of one of these dynasties, the Samanids, who claimed descent from the Sassanid general Bahram Chobin. Abu Mansur Muhammad, a dehqan and governor of Tus, had ordered his minister Abu Mansur Mamari to invite several local scholars to compile a prose Shahnameh, although it no longer survives, Ferdowsi used it as one of the sources of his epic. Samanid rulers were patrons of such important Persian poets as Rudaki, Ferdowsi followed in the footsteps of these writers. Details about Ferdowsis education are lacking, judging by the Shahnameh, there is no evidence he knew either Arabic or Pahlavi. Although New Persian was permeated by Arabic vocabulary by Ferdowsis time and this may have been a deliberate strategy by the poet. It is possible that Ferdowsi wrote some poems which have not survived. He began work on the Shahnameh around 977, intending it as a continuation of the work of his fellow poet Daqiqi, like Daqiqi, Ferdowsi employed the prose Shahnameh of ʿAbd-al-Razzāq as a source
14.
Caucasus Mountains
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The Caucasus Mountains are a mountain system in Eurasia between the Black Sea and the Caspian Sea in the Caucasus region. The Caucasus Mountains include the Greater Caucasus in the north and Lesser Caucasus in the south, the Greater Caucasus runs west-northwest to east-southeast, from the Caucasian Natural Reserve in the vicinity of Sochi on the northeastern shore of the Black Sea nearly to Baku on the Caspian Sea. The Lesser Caucasus runs parallel to the Greater about 100 km south, the Greater and Lesser Caucasus ranges are connected by the Likhi Range, and to the west and east of the Likhi Range lie the Colchis Plain and the Kur-Araz Lowland. The Meskheti Range is a part of the Lesser Caucasus system, in the southeast the Aras River separates the Lesser Caucasus from the Talysh Mountains which straddle the border of southeastern Azerbaijan and Iran. The highest peak in the Caucasus range is Mount Elbrus in the Greater Caucasus, Mountains near Sochi hosted part of the 2014 Winter Olympics. Geologically, the Caucasus Mountains belong to a system that extends from southeastern Europe into Asia, the Greater Caucasus Mountains are mainly composed of Cretaceous and Jurassic rocks with the Paleozoic and Precambrian rocks in the higher regions. Some volcanic formations are found throughout the range, on the other hand, the Lesser Caucasus Mountains are formed predominantly of the Paleogene rocks with a much smaller portion of the Jurassic and Cretaceous rocks. The Caucasus Mountains formed largely as the result of a plate collision between the Arabian plate moving northwards with respect to the Eurasian plate. As this happened, the rocks that had been deposited in this basin from the Jurassic to the Miocene were folded to form the Greater Caucasus Mountains. This collision also caused the uplift and the Cenozoic volcanic activity in the Lesser Caucasus Mountains, the entire region is regularly subjected to strong earthquakes from this activity. While the Greater Caucasus Mountains have a mainly folded sedimentary structure, the Javakheti Volcanic Plateau in Georgia and the surrounding volcanic ranges which extend well into central Armenia are some of the youngest features of the region. The Kazbek is no active, but the Elbrus erupted in postglacial times. Contemporary seismic activity is a prominent feature of the region, reflecting active faulting, clusters of seismicity occur in Dagestan and in northern Armenia. Many devastating earthquakes have been documented in historical times, including the Spitak earthquake in December 1988 which destroyed the Gyumri-Vanadzor region of Armenia, europes highest mountain is Mount Elbrus 5,642 m in the Caucasus Mountains. Elbrus is 832 m higher than Mont Blanc, the highest peak in the Alps at 4,810 m, the Caucasus Mountains are defined as the continental divide between Asia and Europe for the region between the Black and Caspian Seas. The table below lists some of the highest peaks of the Caucasus, with the exception of Shkhara, the heights are taken from Soviet 1,50,000 mapping. There are higher and more prominent, but nameless, peaks than some of the peaks included below, the climate of the Caucasus varies both vertically and horizontally. Temperature generally decreases as elevation rises, average annual temperature in Sukhumi, Abkhazia at sea level is 15 °C while on the slopes of Mt. Kazbek at an elevation of 3,700 metres, average annual temperature falls to−6.1 °C
15.
Strait of Hormuz
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The Strait of Hormuz /hɔːrˈmuːz/ Persian, تنگه هرمز Tangehyyeh Hormoz listen, Arabic, مَضيق هُرمُز Maḍīq Hurmuz) is a strait between the Persian Gulf and the Gulf of Oman. It provides the only sea passage from the Persian Gulf to the ocean and is one of the worlds most strategically important choke points. On the north coast lies Iran, and on the south coast the United Arab Emirates and Musandam, at its narrowest, the strait has a width of 29 nautical miles. About 20% of the worlds petroleum passes through the strait, making it an important strategic location for international trade. At the upper end of this there is a market-town designated by law called Apologus, situated near Charaex Spasini. In the 10th–17th centuries AD, the Kingdom of Ormus, which seems to have given the strait its name, was located here, scholars, historians and linguists derive the name Ormuz from the local Persian word هورمغ Hur-mogh meaning date palm. In the local dialects of Hurmoz and Minab this strait is still called Hurmogh and has the aforementioned meaning, the resemblance of this word with the name of the Persian god هرمز Hormoz has resulted in the popular belief that these words are related. To reduce the risk of collision, ships moving through the Strait follow a Traffic Separation Scheme, inbound ships use one lane, outbound ships another, the lanes are separated by a two-mile-wide median. To traverse the Strait, ships pass through the waters of Iran and Oman under the transit passage provisions of the United Nations Convention on the Law of the Sea. Although not all countries have ratified the convention, most countries, Oman has a radar site Link Quality Indicator to monitor the TSS in the Strait of Hormuz. This site is on an island on the peak of Musandam Peninsula. According to the U. S. Energy Information Administration, in 2011 and this was said to represent 35% of the worlds seaborne oil shipments and 20% of oil traded worldwide. The report stated that more than 85% of these crude oil exports went to Asian markets, with Japan, India, South Korea, unlike other straits, there is no bridge or tunnel at the Strait. On 18 April 1988, the U. S. Navy waged a battle against Iranian forces in. The battle, dubbed Operation Praying Mantis by the U. S. was launched in retaliation for the USS Samuel B. Roberts striking a mine laid in the channel by Iran on 14 April. U. S. forces sank one frigate, one gunboat, on 8 January 2007, the nuclear submarine USS Newport News, traveling submerged, struck MV Mogamigawa, a 300, 000-ton Japanese-flagged very large crude tanker, south of the strait. There were no injuries, and no oil leaked from the tanker, a series of naval stand-offs between Iranian speedboats and U. S. warships in the Strait of Hormuz occurred in December 2007 and January 2008. U. S. officials accused Iran of harassing and provoking their naval vessels and this followed more ambiguous threats from Irans oil minister and other government officials that an attack on Iran would result in turmoil in the worlds oil supply
16.
Milad Tower
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Milad Tower, also known as the Tehran Tower, is a multi-purpose tower in Tehran, Iran. It is the sixth-tallest tower and the 17th-tallest freestanding structure in the world and it is located between the Qarb Town and Gisha District, standing at 435 metres from base to the tip of the antenna. The head consists of a pod with 12 floors, the roof of which is at 315 m. The tower is a part of a complex called International Trade, the complex also includes a five-star hotel, a convention center, a world trade center, and an IT park. The tower was first proposed as part of the Shahestan Pahlavi project, in Tehrans Abbas Abad district, the project would have cost $5 billion. The firm also employed Lisa Halaby, the future Queen Noor of Jordan, after the 1979 Revolution, the project was cancelled. Construction of the tower was commenced in 1997, upon completion of its 11-year-long construction in 2008, the Milad Tower was considered the fourth-tallest free-standing telecommunication tower in the world. The tower was opened on 20 February 2009 by the 55th Mayor of Tehran, Mohammad-Bagher Ghalibaf. More than 250 local and foreign journalists were covering the event, Milad Tower, with its height of 435 m, is the tallest tower in Iran, and the sixth-tallest telecommunication tower in the world. It consists of five parts, including the foundation, transition structure, shaft, head structure. The lobby structure consists of six floors, the first three floors consist of 63 trade units,11 food courts, a cafeteria, and a commercial products exhibition which is supposed to be 260 m2. The first and second floors underground consist of official and installing sections, the ground floor is devoted to the entrance and visitors reception. The shaft is a structure which is 315 m-high from the ground floor. In three different sides of it,6 elevators are used to transfer the visitors to the head of the tower at the speed of 7 m/s, the head of the tower is a steel structure weighing about 25,000 tonnes and consisting of 12 floors. The four-stage antenna mast is 120 m-high, Milad Tower has an octagonal base, symbolising traditional Persian architecture. The design of the project was conducted by Dr. Mohammad Reza Hafezi, since he has known as the architect. The tower was built by Boland Payeh Company as the contractor, and customized by Yadman Sazeh Company. A five-star hotel with an area of 52,000 m2 has been established in order to local and global tourists
17.
Iranian plateau
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The Persian Plateau, or Iranian Plateau, is a geological formation in Western Asia and Central Asia. As a historical region, it includes Parthia, Media, Persis, the Zagros Mountains form the plateaus western boundary, and its eastern slopes may be included in the term. The Encyclopædia Britannica excludes lowland Khuzestan explicitly and characterizes Elam as spanning the region from the Mesopotamian plain to the Iranian Plateau, from the Caspian in the northwest to Baluchistan in the south-east, the Iranian Plateau extends for close to 2,000 km. It is a geologically well-studied area because of general interest in continental collision zones, the Iranian plateau in geology refers to a geographical area north of the great folded mountain belts resulting from the collision of the Arabian plate with the Eurasian plate. In this definition, the Iranian plateau does not cover southwestern Iran and it extends from East Azerbaijan Province in northwest of Iran all the way to Pakistan west of the Indus River. It also includes parts of the Republic of Azerbaijan and Turkmenistan. Its mountain ranges can be divided into five major sub-regions, the region is known as the Anti-Taurus, and the average elevation of its peaks exceeds 3,000 m. Mount Ararat, at 5,137 meters the highest point in Turkey, is located in the Anti-Taurus, Lake Van is situated in the mountains at an elevation of 1,546 meters. Several small streams empty into the Black Sea or landlocked Lake Van also originate in these mountains. The Indus River begins in the highlands of Tibet and flows the length of Pakistan almost tracing the eastern edge of the Iranian plateau, the Indus River forms the Iranian plateaus eastern boundary. Southeast Anatolia lies south of the Anti-Taurus Mountains and it is a region of rolling hills and a broad plateau surface that extends into Syria. Elevations decrease gradually, from about 800 meters in the north to about 500 meters in the south, traditionally, wheat and barley are the main crops of the region. The kingdoms of Aratta known from cuneiform sources may have located in the Central Iranian Plateau. In classical antquity the region was known as Persia, due to the Persian Achaemenid dynasty, originating in Persia proper, the Middle Persian Erān began to be used in reference to the state from the Sassanid period. Oak forests are found around Shiraz, aspen, elm, ash, willow, walnut, pine, and cypress are also found, though the latter two are rare. As of 1920, poplar was harvested for making doors, other trees like acacia, cypress, and Turkestan elm were used for decorative purposes. Flower wise, the plateau can grow lilac, jasmine, hawthorn and Cercis siliquastrum are common, which are both used for basket weaving. The Iranian plateau harvests trees for making doors, ploughs, pears, apples, apricots, quince, plums, nectarines, cherries, mulberries, and peaches were commonly seen in the 20th century
18.
Devonian
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The Devonian is a geologic period and system of the Paleozoic, spanning 60 million years from the end of the Silurian,419.2 million years ago, to the beginning of the Carboniferous,358.9 Mya. It is named after Devon, England, where rocks from this period were first studied, the first significant adaptive radiation of life on dry land occurred during the Devonian. Free-sporing vascular plants began to spread across dry land, forming extensive forests which covered the continents, by the middle of the Devonian, several groups of plants had evolved leaves and true roots, and by the end of the period the first seed-bearing plants appeared. Various terrestrial arthropods also became well-established, Fish reached substantial diversity during this time, leading the Devonian to often be dubbed the Age of Fish. The first ray-finned and lobe-finned bony fish appeared, while the placodermi began dominating almost every aquatic environment. The ancestors of all four-limbed vertebrates began adapting to walking on land, as their strong pectoral, in the oceans, primitive sharks became more numerous than in the Silurian and Late Ordovician. The first ammonites, species of molluscs, appeared, trilobites, the mollusk-like brachiopods and the great coral reefs, were still common. The Late Devonian extinction which started about 375 million years ago severely affected marine life, killing off all placodermi, and all trilobites, save for a few species of the order Proetida. The palaeogeography was dominated by the supercontinent of Gondwana to the south, the continent of Siberia to the north, while the rock beds that define the start and end of the Devonian period are well identified, the exact dates are uncertain. According to the International Commission on Stratigraphy, the Devonian extends from the end of the Silurian 419.2 Mya, another common term is Age of the Fishes, referring to the evolution of several major groups of fish that took place during the period. Older literature on the Anglo-Welsh basin divides it into the Downtonian, Dittonian, Breconian and Farlovian stages, in the Late Devonian, by contrast, arid conditions were less prevalent across the world and temperate climates were more common. The Devonian Period is formally broken into Early, Middle and Late subdivisions, the rocks corresponding to those epochs are referred to as belonging to the Lower, Middle and Upper parts of the Devonian System. Early Devonian The Early Devonian lasted from 419.2 ±2.8 to 393.3 ±2.5 and began with the Lochkovian stage, which lasted until the Pragian. It spanned from 410.8 ±2.8 to 407.6 ±2.5, and was followed by the Emsian, which lasted until the Middle Devonian began,393. 3±2.7 million years ago. Middle Devonian The Middle Devonian comprised two subdivisions, first the Eifelian, which gave way to the Givetian 387. 7±2.7 million years ago. Late Devonian Finally, the Late Devonian started with the Frasnian,382.7 ±2.8 to 372.2 ±2.5, during which the first forests took shape on land. The first tetrapods appeared in the record in the ensuing Famennian subdivision. This lasted until the end of the Devonian,358. 9±2.5 million years ago, the Devonian was a relatively warm period, and probably lacked any glaciers
19.
Oligocene
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The Oligocene is a geologic epoch of the Paleogene Period and extends from about 33.9 million to 23 million years before the present. As with other geologic periods, the rock beds that define the epoch are well identified but the exact dates of the start. The name Oligocene comes from the Ancient Greek ὀλίγος and καινός, the Oligocene is preceded by the Eocene Epoch and is followed by the Miocene Epoch. The Oligocene is the third and final epoch of the Paleogene Period, the Oligocene is often considered an important time of transition, a link between the archaic world of the tropical Eocene and the more modern ecosystems of the Miocene. Major changes during the Oligocene included an expansion of grasslands. By contrast, the Oligocene–Miocene boundary is not set at an easily identified worldwide event, Oligocene faunal stages from youngest to oldest are, The Paleogene Period general temperature decline is interrupted by an Oligocene 7-million-year stepwise climate change. A deeper 8.2 °C,400, 000-year temperature depression leads the 2 °C, the stepwise climate change began 32.5 Ma and lasted through to 25.5 Ma, as depicted in the PaleoTemps chart. The Oligocene climate change was a increase in ice volume. The 7-million-year depression abruptly terminated within 1–2 million years of the La Garita Caldera eruption at 28–26 Ma, a deep 400, 000-year glaciated Oligocene Miocene boundary event is recorded at McMurdo Sound and King George Island. During this epoch, the continued to drift toward their present positions. Antarctica became more isolated and finally developed an ice cap, a brief marine incursion marks the early Oligocene in Europe. Marine fossils from the Oligocene are rare in North America, there appears to have been a land bridge in the early Oligocene between North America and Europe, since the faunas of the two regions are very similar. Sometime during the Oligocene, South America was finally detached from Antarctica and it also allowed the Antarctic Circumpolar Current to flow, rapidly cooling the Antarctic continent. Angiosperms continued their expansion throughout the world as tropical and sub-tropical forests were replaced by deciduous forests. Open plains and deserts became more common and grasses expanded from their habitat in the Eocene moving out into open tracts. However, even at the end of the period, grass was not quite enough for modern savannas. In North America, subtropical species dominated with cashews and lychee trees present, and temperate trees such as roses, beeches, the legumes spread, while sedges, bulrushes, and ferns continued their ascent. Even more open landscapes allowed animals to grow to larger sizes than they had earlier in the Paleocene epoch 30 million years earlier, marine faunas became fairly modern, as did terrestrial vertebrate fauna on the northern continents
20.
Jurassic
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The Jurassic is a geologic period and system that spans 56.3 million years from the end of the Triassic Period 201.3 million years ago to the beginning of the Cretaceous Period 145 Mya. The Jurassic constitutes the middle period of the Mesozoic Era, also known as the Age of Reptiles, the start of the period is marked by the major Triassic–Jurassic extinction event. The Jurassic is named after the Jura Mountains within the European Alps, by the beginning of the Jurassic, the supercontinent Pangaea had begun rifting into two landmasses, Laurasia to the north and Gondwana to the south. This created more coastlines and shifted the continental climate from dry to humid, on land, the fauna transitioned from the Triassic fauna, dominated by both dinosauromorph and crocodylomorph archosaurs, to one dominated by dinosaurs alone. The first birds also appeared during the Jurassic, having evolved from a branch of theropod dinosaurs, other major events include the appearance of the earliest lizards, and the evolution of therian mammals, including primitive placentals. Crocodilians made the transition from a terrestrial to a mode of life. The oceans were inhabited by marine reptiles such as ichthyosaurs and plesiosaurs, the chronostratigraphic term Jurassic is directly linked to the Jura Mountains. The name Jura is derived from the Celtic root jor, which was Latinised into juria, the Jurassic period is divided into the Early Jurassic, Middle, and Late Jurassic epochs. The Jurassic System, in stratigraphy, is divided into the Lower Jurassic, Middle, the separation of the term Jurassic into three sections goes back to Leopold von Buch. The Jurassic North Atlantic Ocean was relatively narrow, while the South Atlantic did not open until the following Cretaceous period, the Tethys Sea closed, and the Neotethys basin appeared. Climates were warm, with no evidence of glaciation, as in the Triassic, there was apparently no land over either pole, and no extensive ice caps existed. In contrast, the North American Jurassic record is the poorest of the Mesozoic, the Jurassic was a time of calcite sea geochemistry in which low-magnesium calcite was the primary inorganic marine precipitate of calcium carbonate. Carbonate hardgrounds were thus very common, along with calcitic ooids, calcitic cements, the first of several massive batholiths were emplaced in the northern American cordillera beginning in the mid-Jurassic, marking the Nevadan orogeny. Important Jurassic exposures are found in Russia, India, South America, Japan, Australasia. As the Jurassic proceeded, larger and more groups of dinosaurs like sauropods and ornithopods proliferated in Africa. Middle Jurassic strata are well represented nor well studied in Africa. Late Jurassic strata are also poorly represented apart from the spectacular Tendaguru fauna in Tanzania, the Late Jurassic life of Tendaguru is very similar to that found in western North Americas Morrison Formation. During the Jurassic period, the primary living in the sea were fish
21.
Limestone
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Limestone is a sedimentary rock, composed mainly of skeletal fragments of marine organisms such as coral, forams and molluscs. Its major materials are the minerals calcite and aragonite, which are different crystal forms of calcium carbonate, about 10% of sedimentary rocks are limestones. The solubility of limestone in water and weak acid solutions leads to karst landscapes, most cave systems are through limestone bedrock. The first geologist to distinguish limestone from dolomite was Belsazar Hacquet in 1778, like most other sedimentary rocks, most limestone is composed of grains. Most grains in limestone are skeletal fragments of organisms such as coral or foraminifera. Other carbonate grains comprising limestones are ooids, peloids, intraclasts and these organisms secrete shells made of aragonite or calcite, and leave these shells behind when they die. Limestone often contains variable amounts of silica in the form of chert or siliceous skeletal fragment, some limestones do not consist of grains at all, and are formed completely by the chemical precipitation of calcite or aragonite, i. e. travertine. Secondary calcite may be deposited by supersaturated meteoric waters and this produces speleothems, such as stalagmites and stalactites. Another form taken by calcite is oolitic limestone, which can be recognized by its granular appearance, the primary source of the calcite in limestone is most commonly marine organisms. Some of these organisms can construct mounds of rock known as reefs, below about 3,000 meters, water pressure and temperature conditions cause the dissolution of calcite to increase nonlinearly, so limestone typically does not form in deeper waters. Limestones may also form in lacustrine and evaporite depositional environments, calcite can be dissolved or precipitated by groundwater, depending on several factors, including the water temperature, pH, and dissolved ion concentrations. Calcite exhibits a characteristic called retrograde solubility, in which it becomes less soluble in water as the temperature increases. Impurities will cause limestones to exhibit different colors, especially with weathered surfaces, Limestone may be crystalline, clastic, granular, or massive, depending on the method of formation. Crystals of calcite, quartz, dolomite or barite may line small cavities in the rock, when conditions are right for precipitation, calcite forms mineral coatings that cement the existing rock grains together, or it can fill fractures. Travertine is a banded, compact variety of limestone formed along streams, particularly there are waterfalls. Calcium carbonate is deposited where evaporation of the leaves a solution supersaturated with the chemical constituents of calcite. Tufa, a porous or cellular variety of travertine, is found near waterfalls, coquina is a poorly consolidated limestone composed of pieces of coral or shells. During regional metamorphism that occurs during the building process, limestone recrystallizes into marble
22.
Granite
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Granite is a common type of felsic intrusive igneous rock that is granular and phaneritic in texture. Granites can be white, pink, or gray in color. The word granite comes from the Latin granum, a grain, in reference to the structure of such a holocrystalline rock. By definition, granite is a rock with at least 20% quartz. The term granitic means granite-like and is applied to granite and a group of igneous rocks with similar textures and slight variations in composition. Occasionally some individual crystals are larger than the groundmass, in case the texture is known as porphyritic. A granitic rock with a texture is known as a granite porphyry. Granitoid is a general, descriptive field term for lighter-colored, coarse-grained igneous rocks, petrographic examination is required for identification of specific types of granitoids. The extrusive igneous rock equivalent of granite is rhyolite, Granite is nearly always massive, hard and tough, and therefore it has gained widespread use throughout human history, and more recently as a construction stone. The average density of granite is between 2.65 and 2.75 g/cm3, its compressive strength usually lies above 200 MPa, and its viscosity near STP is 3–6 •1019 Pa·s. The melting temperature of dry granite at ambient pressure is 1215–1260 °C, it is reduced in the presence of water. Granite has poor primary permeability, but strong secondary permeability, true granite according to modern petrologic convention contains both plagioclase and alkali feldspars. When a granitoid is devoid or nearly devoid of plagioclase, the rock is referred to as alkali feldspar granite, when a granitoid contains less than 10% orthoclase, it is called tonalite, pyroxene and amphibole are common in tonalite. A granite containing both muscovite and biotite micas is called a binary or two-mica granite, two-mica granites are typically high in potassium and low in plagioclase, and are usually S-type granites or A-type granites. A worldwide average of the composition of granite, by weight percent, based on 2485 analyses. Much of it was intruded during the Precambrian age, it is the most abundant basement rock that underlies the relatively thin veneer of the continents. Outcrops of granite tend to form tors and rounded massifs, granites sometimes occur in circular depressions surrounded by a range of hills, formed by the metamorphic aureole or hornfels. Granite often occurs as small, less than 100 km² stock masses
23.
Sandstone
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Sandstone is a clastic sedimentary rock composed mainly of sand-sized minerals or rock grains. Most sandstone is composed of quartz or feldspar because these are the most common minerals in the Earths crust, like sand, sandstone may be any color, but the most common colors are tan, brown, yellow, red, grey, pink, white, and black. Since sandstone beds often form highly visible cliffs and other topographic features, quartz-bearing sandstone is converted into quartzite through heating and pressure, usually related to tectonic compression within orogenic belts. They are formed from cemented grains that may either be fragments of a rock or be mono-minerallic crystals. The cements binding these grains together are typically calcite, clays, grain sizes in sands are defined within the range of 0.0625 mm to 2 mm. The formation of sandstone involves two principal stages, first, a layer or layers of sand accumulates as the result of sedimentation, either from water or from air. Typically, sedimentation occurs by the settling out from suspension. The most common cementing materials are silica and calcium carbonate, which are derived either from dissolution or from alteration of the sand after it was buried. Colours will usually be tan or yellow, a predominant additional colourant in the southwestern United States is iron oxide, which imparts reddish tints ranging from pink to dark red, with additional manganese imparting a purplish hue. Red sandstones are seen in the Southwest and West of Britain, as well as central Europe. The regularity of the latter favours use as a source for masonry, either as a building material or as a facing stone. These physical properties allow the grains to survive multiple recycling events. Quartz grains evolve from rock, which are felsic in origin. Feldspathic framework grains are commonly the second most abundant mineral in sandstones, Feldspar can be divided into two smaller subdivisions, alkali feldspars and plagioclase feldspars. The different types of feldspar can be distinguished under a petrographic microscope, below is a description of the different types of feldspar. Alkali feldspar is a group of minerals in which the composition of the mineral can range from KAlSi3O8 to NaAlSi3O8. Plagioclase feldspar is a group of solid solution minerals that range in composition from NaAlSi3O8 to CaAl2Si2O8. Lithic framework grains are pieces of ancient source rock that have yet to weather away to individual mineral grains, accessory minerals are all other mineral grains in a sandstone, commonly these minerals make up just a small percentage of the grains in a sandstone
24.
Shale
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Shale is a fine-grained, clastic sedimentary rock composed of mud that is a mix of flakes of clay minerals and tiny fragments of other minerals, especially quartz and calcite. The ratio of clay to other minerals is variable, shale is characterized by breaks along thin laminae or parallel layering or bedding less than one centimeter in thickness, called fissility. Mudstones, on the hand, are similar in composition. Before the mid 19th century, the slate, shale. In the context of underground mining, shale was frequently referred to as slate well into the 20th century. Non-fissile rocks of similar composition but made of smaller than 0.06 mm are described as mudstones or claystone. Rocks with similar sizes but with less clay and therefore grittier are siltstones. Shale is the most common sedimentary rock, shales are typically composed of variable amounts of clay minerals and quartz grains and the typical color is gray. Addition of variable amounts of minor constituents alters the color of the rock, black shale results from the presence of greater than one percent carbonaceous material and indicates a reducing environment. Black shale can also be referred to as black metal, red, brown and green colors are indicative of ferric oxide, iron hydroxide, or micaceous minerals. Clays are the constituent of shales and other mudrocks. The clay minerals represented are largely kaolinite, montmorillonite and illite, clay minerals of Late Tertiary mudstones are expandable smectites whereas in older rocks especially in mid- to early Paleozoic shales illites predominate. The transformation of smectite to illite produces silica, sodium, calcium, magnesium, iron and these released elements form authigenic quartz, chert, calcite, dolomite, ankerite, hematite and albite, all trace to minor minerals found in shales and other mudrocks. Shales and mudrocks contain roughly 95 percent of the matter in all sedimentary rocks. However, this amounts to less than one percent by mass in an average shale, black shales, which form in anoxic conditions, contain reduced free carbon along with ferrous iron and sulfur. Pyrite and amorphous iron sulfide along with carbon produce the black coloration, the process in the rock cycle which forms shale is called compaction. The fine particles that compose shale can remain suspended in long after the larger particles of sand have deposited. Shales are typically deposited in very slow moving water and are found in lakes and lagoonal deposits, in river deltas, on floodplains
25.
Carboniferous
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The Carboniferous is a geologic period and system that spans 60 million years from the end of the Devonian Period 358.9 million years ago, to the beginning of the Permian Period,298.9 Mya. The name Carboniferous means coal-bearing and derives from the Latin words carbō and ferō, and was coined by geologists William Conybeare and William Phillips in 1822. Based on a study of the British rock succession, it was the first of the system names to be employed. The Carboniferous is often treated in North America as two periods, the earlier Mississippian and the later Pennsylvanian. Terrestrial life was established by the Carboniferous period. Amphibians were the dominant land vertebrates, of one branch would eventually evolve into amniotes. Arthropods were also common, and many were much larger than those of today. Vast swaths of forest covered the land, which would eventually be laid down, the atmospheric content of oxygen also reached their highest levels in geological history during the period, 35% compared with 21% today, allowing terrestrial invertebrates to evolve to great size. A major marine and terrestrial extinction event, the Carboniferous rainforest collapse, occurred in the middle of the period, the later half of the period experienced glaciations, low sea level, and mountain building as the continents collided to form Pangaea. In the United States the Carboniferous is usually broken into Mississippian and Pennsylvanian subperiods, the Silesian is roughly contemporaneous with the late Mississippian Serpukhovian plus the Pennsylvanian. In Britain the Dinantian is traditionally known as the Carboniferous Limestone, the Namurian as the Millstone Grit, and the Westphalian as the Coal Measures and Pennant Sandstone. There was also a drop in south polar temperatures, southern Gondwanaland was glaciated throughout the period and these conditions apparently had little effect in the deep tropics, where lush swamps, later to become coal, flourished to within 30 degrees of the northernmost glaciers. Mid-Carboniferous, a drop in sea level precipitated a major extinction, one that hit crinoids. This sea level drop and the unconformity in North America separate the Mississippian subperiod from the Pennsylvanian subperiod. This happened about 323 million years ago, at the onset of the Permo-Carboniferous Glaciation, the Carboniferous was a time of active mountain-building, as the supercontinent Pangaea came together. The southern continents remained tied together in the supercontinent Gondwana, which collided with North America–Europe along the present line of eastern North America, in the same time frame, much of present eastern Eurasian plate welded itself to Europe along the line of the Ural mountains. Most of the Mesozoic supercontinent of Pangea was now assembled, although North China, the Late Carboniferous Pangaea was shaped like an O. There were two major oceans in the Carboniferous—Panthalassa and Paleo-Tethys, which was inside the O in the Carboniferous Pangaea, other minor oceans were shrinking and eventually closed - Rheic Ocean, the small, shallow Ural Ocean and Proto-Tethys Ocean
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Permian
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The Permian is a geologic period and system which spans 46.7 million years from the end of the Carboniferous Period 298.9 million years ago, to the beginning of the Triassic Period 252.2 Mya. It is the last period of the Paleozoic Era, the following Triassic Period belongs to the Mesozoic Era, the concept of the Permian was introduced in 1841 by geologist Sir Roderick Murchison, who named it after the city of Perm. The Permian witnessed the diversification of the early amniotes into the groups of the mammals, turtles, lepidosaurs. The world at the time was dominated by two known as Pangaea and Siberia, surrounded by a global ocean called Panthalassa. The Carboniferous rainforest collapse left behind vast regions of desert within the continental interior, amniotes, who could better cope with these drier conditions, rose to dominance in place of their amphibian ancestors. The Permian ended with the Permian–Triassic extinction event, the largest mass extinction in Earths history, in which nearly 90% of marine species and it would take well into the Triassic for life to recover from this catastrophe. Recovery from the Permian-Triassic extinction event was protracted, on land, the term Permian was introduced into geology in 1841 by Sir R. I. Murchison, president of the Geological Society of London, who identified typical strata in extensive Russian explorations undertaken with Edouard de Verneuil, the region now lies in the Perm Krai of Russia. This could have in part caused the extinctions of marine species at the end of the period by severely reducing shallow coastal areas preferred by many marine organisms. During the Permian, all the Earths major landmasses were collected into a supercontinent known as Pangaea. The Cimmeria continent rifted away from Gondwana and drifted north to Laurasia, a new ocean was growing on its southern end, the Tethys Ocean, an ocean that would dominate much of the Mesozoic Era. Large continental landmass interiors experience climates with extreme variations of heat and cold, deserts seem to have been widespread on Pangaea. Such dry conditions favored gymnosperms, plants with seeds enclosed in a cover, over plants such as ferns that disperse spores in a wetter environment. The first modern trees appeared in the Permian, the climate in the Permian was quite varied. At the start of the Permian, the Earth was still in an Ice Age, glaciers receded around the mid-Permian period as the climate gradually warmed, drying the continents interiors. In the late Permian period, the drying continued although the temperature cycled between warm and cool cycles, Permian marine deposits are rich in fossil mollusks, echinoderms, and brachiopods. By the close of the Permian, trilobites and a host of other groups became extinct. Terrestrial life in the Permian included diverse plants, fungi, arthropods, the period saw a massive desert covering the interior of Pangaea
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Mesozoic
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The Mesozoic Era is an interval of geological time from about 252 to 66 million years ago. This Era is also called from a paleobotanist view the Age of Conifers, Mesozoic means middle life, deriving from the Greek prefix meso-/μεσο- for between and zōon/ζῷον meaning animal or living being. It is one of three eras of the Phanerozoic Eon, preceded by the Paleozoic and succeeded by the Cenozoic. The era is subdivided into three periods, the Triassic, Jurassic, and Cretaceous, which are further subdivided into a number of epochs. The Mesozoic was a time of significant tectonic, climate and evolutionary activity, the era witnessed the gradual rifting of the supercontinent Pangaea into separate landmasses that would eventually move into their current positions. The climate of the Mesozoic was varied, alternating between warming and cooling periods, overall, however, the Earth was hotter than it is today. Birds first appeared in the Jurassic, having evolved from a branch of theropod dinosaurs, the first mammals also appeared during the Mesozoic, but would remain small—less than 15 kg —until the Cenozoic. Following the Paleozoic, the Mesozoic extended roughly 186 million years and this time frame is separated into three geologic periods. It is also known as the Great Dying because it is considered the largest mass extinction in the Earths history, the upper boundary of the Mesozoic is set at the Cretaceous–Paleogene extinction event, which may have been caused by the impactor that created Chicxulub Crater on the Yucatán Peninsula. Towards the Late Cretaceous large volcanic eruptions are believed to have contributed to the Cretaceous–Paleogene extinction event. Approximately 50% of all genera became extinct, including all of the non-avian dinosaurs, the Triassic ranges roughly from 252 million to 201 million years ago. The Triassic is a time in Earths history bracketed between the Permian Extinction and the Triassic–Jurassic extinction event, two of the big five, and precedes the Jurassic Period and it has three major epochs, the Early Triassic, the Middle Triassic and the Late Triassic. The Early Triassic was between about 252 million to 247 million years ago and was dominated by deserts as Pangaea had not yet broken up, thus the interior was nothing, the Earth had just witnessed a massive die-off in which 95% of all life became extinct. The most common life on earth were Lystrosaurus, labyrinthodonts. Temnospondyls evolved during this time and would be the dominant predator for much of the Triassic, the Middle Triassic spans roughly from 247 million to 237 million years ago. The Middle Triassic featured the beginnings of the breakup of Pangaea, the ecosystem had recovered from the devastation that was the Great Dying. Algae, sponge, corals, and crustaceans all had recovered, new aquatic reptiles evolved, such as ichthyosaurs and nothosaurs. Meanwhile, on land, pine forests flourished, as did groups of insects like mosquitoes, the first ancient crocodilians evolved, which sparked competition with the large amphibians that had since ruled the freshwater world
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Paleozoic
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The Paleozoic Era is the earliest of three geologic eras of the Phanerozoic Eon, from 541 to 252.17 million years ago. It is the longest of the Phanerozoic eras, and is subdivided into six periods, the Cambrian, Ordovician, Silurian, Devonian, Carboniferous. The Paleozoic comes after the Neoproterozoic era of the Proterozoic and is followed by the Mesozoic, the Paleozoic was a time of dramatic geological, climatic, and evolutionary change. The Cambrian witnessed the most rapid and widespread diversification of life in Earths history, known as the Cambrian explosion, fish, arthropods, amphibians, anapsids, synapsids, euryapsids and diapsids all evolved during the Paleozoic. Life began in the ocean but eventually transitioned onto land, and by the late Paleozoic, Great forests of primitive plants covered the continents, many of which formed the coal beds of Europe and eastern North America. Towards the end of the era, large, sophisticated diapsids and synapsids were dominant, the Paleozoic Era ended with the largest extinction event in the history of Earth, the Permian–Triassic extinction event. The effects of this catastrophe were so devastating that it took life on land 30 million years into the Mesozoic Era to recover, recovery of life in the sea may have been much faster. The Paleozoic era began and ended with supercontinents and in between were the rise of mountains along the margins, and flooding and draining of shallow seas between. At its start, the supercontinent Pannotia broke up, paleoclimatic studies and evidence of glaciers indicate that central Africa was most likely in the polar regions during the early Paleozoic. During the early Paleozoic, the huge continent Gondwana formed or was forming, by mid-Paleozoic, the collision of North America and Europe produced the Acadian-Caledonian uplifts, and a subduction plate uplifted eastern Australia. There are six periods in the Paleozoic Era, Cambrian, Ordovician, Silurian, Devonian, Carboniferous, the Cambrian spans from 541 million years to 485 million years and is the first period of the Paleozoic era of the Phanerozoic. The Cambrian marked a boom in evolution in an event known as the Cambrian explosion in which the largest number of creatures evolved in any period of the history of the Earth. Creatures like algae evolved, but the most ubiquitous of that period were the armored arthropods, almost all marine phyla evolved in this period. During this time, the supercontinent Pannotia begins to break up, the Ordovician spanned from 485 million years to 443 million years ago. The Ordovician is a time in Earths history in many of the biological classes still prevalent today evolved, such as primitive fish, cephalopods. The most common forms of life, however, were trilobites, snails, more importantly, the first arthropods went ashore to colonize the empty continent of Gondwana. By the end of the Ordovican, Gondwana was at the pole, early North America had collided with Europe. Glaciation of Africa resulted in a drop in sea level
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Precambrian
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The Precambrian is the earliest period of Earths history, set before the current Phanerozoic Eon. The Precambrian is a supereon that is subdivided into three eons of the time scale. It spans from the formation of Earth about 4.6 billion years ago to the beginning of the Cambrian Period, about 541 million years ago, the Precambrian accounts for 89% of geologic time. Relatively little is known about the Precambrian, despite it making up roughly seven-eighths of the Earths history, the Precambrian fossil record is poorer than that of the succeeding Phanerozoic, and fossils from that time are of limited biostratigraphic use. This is because many Precambrian rocks have been metamorphosed, obscuring their origins, while others have been destroyed by erosion. A stable crust was apparently in place by 4,412 Ma, the term Precambrian is recognized by the International Commission on Stratigraphy as a general term including the Archean and Proterozoic eons. It is still used by geologists and paleontologists for general discussions not requiring the more specific eon names and it was briefly called the Cryptozoic eon. A specific date for the origin of life has not been determined, carbon found in 3.8 billion year old rocks from islands off western Greenland may be of organic origin. Well-preserved microscopic fossils of bacteria older than 3.46 billion years have found in Western Australia. Probable fossils 100 million years older have been found in the same area, there is a fairly solid record of bacterial life throughout the remainder of the Precambrian. The oldest fossil evidence from that era of such complex life comes from the Lantian formation of the Ediacarian period, a very diverse collection of soft-bodied forms is found in a variety of locations worldwide and date to between 635 and 542 Ma. These are referred to as Ediacaran or Vendian biota, hard-shelled creatures appeared toward the end of that time span, marking the beginning of the Phanerozoic era. By the middle of the following Cambrian period, a diverse fauna is recorded in the Burgess Shale. The explosion in diversity of lifeforms during the early Cambrian is called the Cambrian explosion of life, while land seems to have been devoid of plants and animals, cyanobacteria and other microbes formed prokaryotic mats that covered terrestrial areas. Evidence of the details of plate motions and other activity in the Precambrian has been poorly preserved. It is generally believed that small proto-continents existed prior to 4280 Ma, the supercontinent, known as Rodinia, broke up around 750 Ma. A number of glacial periods have been identified going as far back as the Huronian epoch, one of the best studied is the Sturtian-Varangian glaciation, around 850–635 Ma, which may have brought glacial conditions all the way to the equator, resulting in a Snowball Earth. The atmosphere of the early Earth is not well understood, most geologists believe it was composed primarily of nitrogen, carbon dioxide, and other relatively inert gases, and was lacking in free oxygen
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Gorgan
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Gorgan pronunciation (Persian, گرگان, formerly Astrabad or Astarabad, is the capital of Golestan Province, Iran. It lies approximately 400 kilometres to the north east of Tehran, in the 2006 census, its population was 269,226, in 73,702 families. The region is mentioned in Avesta as Vəhrkāna. The name is derived from the Proto-Iranian word *vrka-, meaning wolf, in post-Islamic Persia the city was known as Jurjān, the Arabized form of the Persian word. The Caspian form of the name is Wergen, there are several archaeological sites near Gorgan, including Tureng Tepe and Shah Tepe, in which there are remains dating to the Neolithic and Chalcolithic eras. According to the Greek historian Arrian, Zadracarta was the largest city of Hyrcania, the term means the yellow city, and it was given to it from the great number of oranges, lemons, and other fruit trees which grew in the outskirts of that city. Hyrcania became part of the Achaemenid Empire during the reign of Cyrus the Great, its founder, the Great Wall of Gorgan, the second biggest defensive wall in the world, was built in the Parthian and Sassanian periods. At the time of the Sassanids, Gurgan appeared as the name of a city, province capital, Gurgan maintained its independence as a Zoroastrian state even after Persia was conquered by the invading Arab Muslims in 8th century. In 1210, the city was invaded and sacked by the army of Kingdom of Georgia under command of the brothers Mkhargrdzeli. The Old Gorgan was destroyed during the Mongol invasion in the 13th century, and the center of the region was moved to what was called Astarabad, Gurgan with its surrounding regions was sometimes considered as part of the Parthia or the Tabaristan regions. Astarabad was an important political and religious city during the Qajar dynasty, the wide Dasht-e Gorgan are located north of the city and geographically bounded by 37°00 - 37°30 north latitude and 54°00 - 54°30 east longitude, covering an area of about 1,700 square kilometres. Some 150 km east of Gorgan is the Golestan National Park, according to Köppen climate classification, Gorgan has a Cfa humid subtropical climate. In general, Golestan has a moderate and humid climate known as the moderate Caspian climate, as a result of the above factors, three different climates exist in the region, plain moderate, mountainous, and semi-arid. Gorgan valley has a semi-arid climate, the average annual temperature is 17.7 °C and the annual rainfall is 601 millimetres. The population of the city has been 329,536 as of 2011, majority of people of Gorgan speak Persian. A big portion of the city are migrants from nearby regions, including Mazanderanis, Azeris, people from Semnan and Khorasan provinces, as well as some Turkmens, and a small population of Kazakhs. Gorgani, a dialect of Mazanderani language, was spoken in the city, but it is extinct now. House of Karen, a feudal family first attested in the Arsacid era
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Triassic
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The Triassic is a geologic period and system which spans 50.9 million years from the end of the Permian Period 252.17 million years ago, to the beginning of the Jurassic Period 201.3 Mya. The Triassic is the first period of the Mesozoic Era, both the start and end of the period are marked by major extinction events. Therapsids and archosaurs were the terrestrial vertebrates during this time. A specialized subgroup of archosaurs, called dinosaurs, first appeared in the Late Triassic, the vast supercontinent of Pangaea existed until the mid-Triassic, after which it began to gradually rift into two separate landmasses, Laurasia to the north and Gondwana to the south. The global climate during the Triassic was mostly hot and dry, however, the climate shifted and became more humid as Pangaea began to drift apart. The end of the period was marked by yet another mass extinction, the Triassic-Jurassic extinction event. The Triassic is usually separated into Early, Middle, and Late Triassic Epochs, from the east, along the equator, the Tethys sea penetrated Pangaea, causing the Paleo-Tethys Ocean to be closed. Later in the mid-Triassic a similar sea penetrated along the equator from the west, the remaining shores were surrounded by the world-ocean known as Panthalassa. All the deep-ocean sediments laid down during the Triassic have disappeared through subduction of oceanic plates, thus, the supercontinent Pangaea was rifting during the Triassic—especially late in that period—but had not yet separated. In North America, for example, marine deposits are limited to a few exposures in the west, thus Triassic stratigraphy is mostly based on organisms that lived in lagoons and hypersaline environments, such as Estheria crustaceans. At the beginning of the Mesozoic Era, Africa was joined with Earths other continents in Pangaea, Africa shared the supercontinents relatively uniform fauna which was dominated by theropods, prosauropods and primitive ornithischians by the close of the Triassic period. Late Triassic fossils are found throughout Africa, but are common in the south than north. The time boundary separating the Permian and Triassic marks the advent of an event with global impact. At Paleorrota geopark, located in Rio Grande do Sul, Brazil, in these formations, one of the earliest dinosaurs, Staurikosaurus, as well as the mammal ancestors Brasilitherium and Brasilodon have been discovered. The Triassic continental interior climate was hot and dry, so that typical deposits are red bed sandstones and evaporites. Pangaeas large size limited the effect of the global ocean, its continental climate was highly seasonal, with very hot summers. The strong contrast between the Pangea supercontinent and the global ocean triggered intense cross-equatorial monsoons, the best studied of such episodes of humid climate, and probably the most intense and widespread, was the Carnian Pluvial Event. On land, the vascular plants included the lycophytes, the dominant cycadophytes, ginkgophyta, ferns, horsetails
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Eocene
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The Eocene Epoch, lasting from 56 to 33.9 million years ago, is a major division of the geologic timescale and the second epoch of the Paleogene Period in the Cenozoic Era. The Eocene spans the time from the end of the Paleocene Epoch to the beginning of the Oligocene Epoch. The start of the Eocene is marked by a period in which the concentration of the carbon isotope 13C in the atmosphere was exceptionally low in comparison with the more common isotope 12C. As with other periods, the strata that define the start and end of the epoch are well identified. The name Eocene comes from the Ancient Greek ἠώς and καινός, the Eocene epoch is conventionally divided into early, middle, and late subdivisions. The corresponding rocks are referred to as lower, middle, the Ypresian stage constitutes the lower, the Priabonian stage the upper, and the Lutetian and Bartonian stages are united as the middle Eocene. The Eocene Epoch contained a variety of different climate conditions that includes the warmest climate in the Cenozoic Era. During this period of time, little to no ice was present on Earth with a difference in temperature from the equator to the poles. Following the maximum was a descent into an icehouse climate from the Eocene Optimum to the Eocene-Oligocene transition at 34 million years ago. During this decrease ice began to reappear at the poles, greenhouse gases, in particular carbon dioxide and methane, played a significant role during the Eocene in controlling the surface temperature. For the early Eocene there is discussion on how much carbon dioxide was in the atmosphere. This is due to numerous proxies representing different atmospheric carbon dioxide content, for contrast, today the carbon dioxide levels are at 400 ppm or 0. 04%. At about the beginning of the Eocene Epoch the amount of oxygen in the atmosphere more or less doubled. During the early Eocene, methane was another gas that had a drastic effect on the climate. In comparison to carbon dioxide, methane has much effect on temperature as methane is ~34 times more effective per molecule than carbon dioxide on a 100-year scale. Most of the methane released to the atmosphere during this period of time would have been from wetlands, swamps, the atmospheric methane concentration today is 0. 000179% or 1.79 ppmv. Due to the climate and sea level rise associated with the early Eocene, more wetlands, more forests. Comparing the early Eocene production of methane to current levels of atmospheric methane, biogenic production of methane produces carbon dioxide and water vapor along with the methane, as well as yielding infrared radiation
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Tuff
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Tuff is a type of rock made of volcanic ash ejected from a vent during a volcanic eruption. Following ejection and deposition, the ash is compacted into a rock in a process called consolidation. Tuff is sometimes called tufa, particularly used as construction material. Rock that contains greater than 50% tuff is considered tuffaceous, Tuff is a relatively soft rock, so it has been used for construction since ancient times. Since it is common in Italy the Romans used it often for construction, the Rapa Nui people used it to make most of the moai statues in Easter Island. Tuff can be classified as either sedimentary or igneous rocks and they are usually studied in the context of igneous petrology, although they are sometimes described using sedimentological terms. The material that is expelled in a volcanic eruption can be classified into three types, Volcanic gases, a mixture mostly of water vapour, carbon dioxide. Lava, the name of magma when it emerges and flows over the surface, and tephra, chunks of solid material of all shapes and sizes ejected and thrown through the air. Tephra is made when magma inside the volcano is blown apart by the expansion of hot volcanic gases. It is common for magma to explode as the gas dissolved in it comes out of solution as the pressure decreases when it flows to the surface and these violent explosions produce solid chunks of material that can then fly from the volcano. When these chunks are smaller than 2 mm in diameter they are called volcanic ash and it is made of small, slaggy pieces of lava and rock that have been tossed into the air by outbursts of steam and other gases. Among the loose beds of ash that cover the slopes of many volcanoes, in addition to true ashes of the kind described above, there are lumps of the old lavas and tuffs forming the walls of the crater, etc. In some great volcanic explosions nothing but materials of the kind were emitted. The ashes vary in size from large blocks twenty feet or more in diameter to the minutest impalpable dust, the large masses are called volcanic bombs, they have mostly a rounded, elliptical or pear-shaped form owing to rotation in the air before they solidified. Many of them have ribbed or nodular surfaces, and sometimes they have a crust intersected by many cracks like the surface of a loaf of bread, any ash in which they are very abundant is called an agglomerate. But many volcanoes stand near the sea, and the ashes cast out by them are mingled with the sediments that are gathering at the bottom of the waters, in this way ashy muds or sands or even in some cases ashy limestones are being formed. As a matter of fact most of the found in the older formations contain admixtures of clay, sand, and sometimes fossil shells. The showers of ashes often follow one another after longer or shorter intervals, the coarsest materials or agglomerates show this least distinctly, in the fine beds it is often developed in great perfection
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Lava
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Lava is the molten rock expelled by a volcano during an eruption. The resulting rock after solidification and cooling is called lava. The molten rock is formed in the interior of planets, including Earth. The source of the heat melts the rock within the earth is geothermal energy. When first erupted from a vent, lava is a liquid usually at temperatures from 700 to 1,200 °C. A lava flow is an outpouring of lava, which is created during a non-explosive effusive eruption. When it has stopped moving, lava solidifies to form igneous rock, the term lava flow is commonly shortened to lava. Although lava can be up to 100,000 times more viscous than water, lava can flow great distances before cooling and solidifying because of its thixotropic, explosive eruptions produce a mixture of volcanic ash and other fragments called tephra, rather than lava flows. The word lava comes from Italian, and is derived from the Latin word labes which means a fall or slide. The first use in connection with extruded magma was apparently in an account written by Francesco Serao on the eruption of Vesuvius between May 14 and June 4,1737. Serao described a flow of lava as an analogy to the flow of water. The composition of almost all lava of the Earths crust is dominated by silicate minerals, mostly feldspars, olivine, pyroxenes, amphiboles, micas, igneous rocks, which form lava flows when erupted, can be classified into three chemical types, felsic, intermediate, and mafic. These classes are primarily chemical, however, the chemistry of lava also tends to correlate with the temperature, its viscosity. Felsic or silicic lavas such as rhyolite and dacite typically form lava spines, most silicic lava flows are extremely viscous, and typically fragment as they extrude, producing blocky autobreccias. Felsic magmas can erupt at temperatures as low as 650 to 750 °C, unusually hot rhyolite lavas, however, may flow for distances of many tens of kilometres, such as in the Snake River Plain of the northwestern United States. Intermediate or andesitic lavas are lower in aluminium and silica, and usually somewhat richer in magnesium, intermediate lavas form andesite domes and block lavas, and may occur on steep composite volcanoes, such as in the Andes. Poorer in aluminium and silica than felsic lavas, and also commonly hotter, greater temperatures tend to destroy polymerized bonds within the magma, promoting more fluid behaviour and also a greater tendency to form phenocrysts. Higher iron and magnesium tends to manifest as a darker groundmass, mafic or basaltic lavas are typified by their high ferromagnesian content, and generally erupt at temperatures in excess of 950 °C
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Tethys Sea
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It is also referred to as the Tethys Sea or Neotethys. About 250 million years ago, during the Triassic, a new ocean began forming in the end of the Paleo-Tethys Ocean. A rift formed along the continental shelf of Southern Pangaea. Over the next 60 million years, that piece of shelf, known as Cimmeria, traveled north, the Tethys Ocean formed between Cimmeria and Gondwana, directly over where the Paleo-Tethys used to be. During the Jurassic Period, Cimmeria finally collided with Laurasia, there it stalled, the ocean floor behind it buckling under, forming the Tethyan Trench. Water levels rose, and the western Tethys shallowly covered significant portions of Europe, thus, ocean currents at that time—around the Early Cretaceous—ran very differently from the way they do today. Between the Jurassic and the Late Cretaceous, Gondwana began breaking up, pushing Africa and India north across the Tethys and opening up the Indian Ocean. As these land masses crowded in on the Tethys ocean from all sides, to as recently as the Late Miocene, the ocean continued to shrink, becoming the Tethys Seaway or second Tethys Sea. Also, throughout the Cenozoic, global sea levels fell hundreds of meters, today, India, Pakistan, Indonesia, and the Indian Ocean cover the area once occupied by the Tethys Ocean, and Turkey, Iraq, and Tibet sit on Cimmeria. What was once the arm of the Tethys Sea was the ancestor of the present-day Mediterranean Sea. Other remnants are the Black, Caspian, and Aral Seas, most of the floor of the Tethys Ocean disappeared under Cimmeria and Laurasia. Similar geologic evidence can be seen in the Alpine orogeny of Europe, greece and the Levant also retain many units of limestone and other sedimentary rocks deposited by various stands of the Tethys Ocean. Paleontologists also find the Tethys Ocean particularly important because much of the worlds sea shelves were found around its margins for such a length of time. Marine, marsh-dwelling, and estuarian fossils from these shelves are of considerable paleontological interest, the Solnhofen limestone in Bavaria, originally a coastal lagoon mud of the Tethys Ocean, yielded the famous Archaeopteryx fossil. However, Eduard Suess is generally seen as the first person to provide evidence for the existence of this ancient and extinct sea. In 1893, using records from the Alps and Africa. He named it the Tethys Sea after the Greek sea goddess Tethys, Suess first proposed his concept of Tethys in his four-volume work Das Antlitz der Erde. This concept evolved during the 20th century and after WW2 Tethys was described as an ocean with a wide eastern end
36.
Arabian Plate
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The Arabian Plate is a minor tectonic plate in the northern and eastern hemispheres. It is one of three continental plates that have been moving northward in recent geological history and colliding with the Eurasian Plate, the Arabian Plate consists mostly of the Arabian peninsula, it extends eastward at the Sinai and the Red Sea and northward to the Levant. The Arabian Plate was part of the African plate during much of the Phanerozoic Eon, the opening of the Red Sea rift led to extensive volcanic activity. There are large volcanic fields called the Older Harrats, such as Harrat Khaybar and Harrat Rahat, some activity still continues especially around Medina, and there are regular eruptions within the Red Sea. The collision between the Arabian Plate and Eurasia is pushing up the Zagros Mountains of Iran, because the Arabian Plate and Eurasian Plate collide, many cities are in danger such as those in southeastern Turkey. These dangers include earthquakes, tsunamis, and volcanoes, countries within the plate include Lebanon, Syria, Djibouti, Yemen, Oman, Qatar, Bahrain, Kuwait, Iraq, Saudi Arabia, Jordan, and the United Arab Emirates. Regions include parts of the Southern Denkalya Subregion, the Southeastern Anatolia Region, Awdal and the Khuzestan Province
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Iranian Plate
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The Iranian Plate is thought to underlie Iran and Afghanistan, and parts of Pakistan and Iraq. It is compressed between the Arabian Plate to the south and the Eurasian Plate to the north and this compression is likely a cause for the very mountainous terrain of the area including the Zagros Mountains. William Bayne Fisher, The Middle East, a Physical, Social, routledge 1978, ISBN 978-0-416-71520-0, p. 15–16
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Eurasian Plate
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It also includes oceanic crust extending westward to the Mid-Atlantic Ridge and northward to the Gakkel Ridge. The eastern side is a boundary with the North American Plate to the north and a boundary with the Philippine Sea Plate to the south, and possibly with the Okhotsk Plate and the Amurian Plate. The southerly side is a boundary with the African Plate to the west, the Arabian Plate in the middle, the westerly side is a divergent boundary with the North American Plate forming the northernmost part of the Mid-Atlantic Ridge, which is straddled by Iceland. The geodynamics of central Asia is dominated by the interaction between the Eurasian and Indian Plates, in this area, many subplates or crust blocks have been recognized, which form the Central Asian and the East Asian transit zones
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Paleogene
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The Paleogene is a geologic period and system that spans 43 million years from the end of the Cretaceous Period 66 million years ago to the beginning of the Neogene Period 23.03 Mya. It is the beginning of the Cenozoic Era of the present Phanerozoic Eon and this period consists of the Paleocene, Eocene and Oligocene epochs. The terms Paleogene System and lower Tertiary System are applied to the rocks deposited during the Paleogene Period. By dividing the Tertiary Period into two periods instead of directly into five epochs, the periods are more comparable to the duration of periods of the preceding Mesozoic and Paleozoic Eras. The trend was caused by the formation of the Antarctic Circumpolar Current. During the Paleogene, the continued to drift closer to their current positions. India was in the process of colliding with Asia, subsequently forming the Himalayas, the Atlantic Ocean continued to widen by a few centimeters each year. Africa was moving north to meet with Europe and form the Mediterranean, inland seas retreated from North America early in the period. Australia had also separated from Antarctica and was drifting towards Southeast Asia, mammals began a rapid diversification during this period. Some of these mammals would evolve into forms that would dominate the land, while others would become capable of living in marine, specialized terrestrial. Those that took to the oceans became modern cetaceans, while those that took to the trees became primates, the group to which humans belong. Birds, which were well established by the end of the Cretaceous. In comparison to birds and mammals, most other branches of life remained unchanged during this period. As the Earth cooled, tropical plants became less numerous and were now restricted to equatorial regions, deciduous plants, which could survive through the seasonal climates the world was now experiencing, became more common. The Paleogene is notable in the context of offshore oil drilling, and especially in Gulf of Mexico oil exploration and these rock formations represent the current cutting edge of deep-water oil discovery. Lower Tertiary explorations to date include, Kaskida Oil Field Tiber Oil Field Jack 2 Paleogene Microfossils, 180+ images of Foraminifera
listen (help·info) Persian: البرز), also spelled as Alburz, Elburz or Elborz, is a mountain range in northern Iran that stretches from the border of Azerbaijan along the western and entire southern coast of the Caspian Sea and finally runs northeast and merges into the Aladagh Mountains in the northern parts of Khorasan. This mountain range is divided into Western, Central, and Eastern Alborz Mountains, the Western Alborz Range (usually called the Talish Mountains) runs south-southeastward almost along the western coast of the Caspian Sea. The Central Alborz (the Alborz Mountains in the strictest sense) runs from west to east along the entire southern coast of the Caspian Sea, while the Eastern Alborz runs in a northeasterly direction towards the northern parts of the Khorasan region southeast of the Caspian Sea. Mount Damavand, the highest mountain in Iran, is located in the Central Alborz Mountains.
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