Paleontology or palaeontology is the scientific study of life that existed prior to, sometimes including, the start of the Holocene Epoch. It includes the study of fossils to determine organisms' evolution and interactions with each other and their environments. Paleontological observations have been documented as far back as the 5th century BC; the science became established in the 18th century as a result of Georges Cuvier's work on comparative anatomy, developed in the 19th century. The term itself originates from Greek παλαιός, palaios, "old, ancient", ὄν, on, "being, creature" and λόγος, logos, "speech, study". Paleontology lies on the border between biology and geology, but differs from archaeology in that it excludes the study of anatomically modern humans, it now uses techniques drawn from a wide range of sciences, including biochemistry and engineering. Use of all these techniques has enabled paleontologists to discover much of the evolutionary history of life all the way back to when Earth became capable of supporting life, about 3.8 billion years ago.
As knowledge has increased, paleontology has developed specialised sub-divisions, some of which focus on different types of fossil organisms while others study ecology and environmental history, such as ancient climates. Body fossils and trace fossils are the principal types of evidence about ancient life, geochemical evidence has helped to decipher the evolution of life before there were organisms large enough to leave body fossils. Estimating the dates of these remains is essential but difficult: sometimes adjacent rock layers allow radiometric dating, which provides absolute dates that are accurate to within 0.5%, but more paleontologists have to rely on relative dating by solving the "jigsaw puzzles" of biostratigraphy. Classifying ancient organisms is difficult, as many do not fit well into the Linnaean taxonomy classifying living organisms, paleontologists more use cladistics to draw up evolutionary "family trees"; the final quarter of the 20th century saw the development of molecular phylogenetics, which investigates how organisms are related by measuring the similarity of the DNA in their genomes.
Molecular phylogenetics has been used to estimate the dates when species diverged, but there is controversy about the reliability of the molecular clock on which such estimates depend. The simplest definition of paleontology is "the study of ancient life"; the field seeks information about several aspects of past organisms: "their identity and origin, their environment and evolution, what they can tell us about the Earth's organic and inorganic past". Paleontology is one of the historical sciences, along with archaeology, astronomy, cosmology and history itself: it aims to describe phenomena of the past and reconstruct their causes. Hence it has three main elements: description of past phenomena; when trying to explain the past and other historical scientists construct a set of hypotheses about the causes and look for a smoking gun, a piece of evidence that accords with one hypothesis over the others. Sometimes the smoking gun is discovered by a fortunate accident during other research. For example, the discovery by Luis and Walter Alvarez of iridium, a extra-terrestrial metal, in the Cretaceous–Tertiary boundary layer made asteroid impact the most favored explanation for the Cretaceous–Paleogene extinction event, although the contribution of volcanism continues to be debated.
The other main type of science is experimental science, said to work by conducting experiments to disprove hypotheses about the workings and causes of natural phenomena. This approach cannot prove a hypothesis, since some experiment may disprove it, but the accumulation of failures to disprove is compelling evidence in favor. However, when confronted with unexpected phenomena, such as the first evidence for invisible radiation, experimental scientists use the same approach as historical scientists: construct a set of hypotheses about the causes and look for a "smoking gun". Paleontology lies between biology and geology since it focuses on the record of past life, but its main source of evidence is fossils in rocks. For historical reasons, paleontology is part of the geology department at many universities: in the 19th and early 20th centuries, geology departments found fossil evidence important for dating rocks, while biology departments showed little interest. Paleontology has some overlap with archaeology, which works with objects made by humans and with human remains, while paleontologists are interested in the characteristics and evolution of humans as a species.
When dealing with evidence about humans and paleontologists may work together – for example paleontologists might identify animal or plant fossils around an archaeological site, to discover what the people who lived there ate. In addition, paleontology borrows techniques from other sciences, including biology, ecology, chemistry and mathematics. For example, geochemical signatures from rocks may help to discover when life first arose on Earth, analyses of carbon isotope ratios may help to identify climate changes and to explain major transitions such as the Permian–Triassic extinction event. A recent discipline, molecular phylogenetics, compares the DNA and RNA of modern organisms to re-construct the "family trees" of their
Field Museum of Natural History
The Field Museum of Natural History known as The Field Museum, is a natural history museum in Chicago, is one of the largest such museums in the world. The museum maintains its status as a premier natural-history museum through the size and quality of its educational and scientific programs, as well as due to its extensive scientific-specimen and artifact collections; the diverse, high-quality permanent exhibitions, which attract up to two million visitors annually, range from the earliest fossils to past and current cultures from around the world to interactive programming demonstrating today's urgent conservation needs. The museum is named in honor of its first major benefactor, the department-store magnate Marshall Field; the museum and its collections originated from the 1893 World’s Columbian Exposition and the artifacts displayed at the fair. The museum maintains a temporary exhibition program of traveling shows as well as in-house produced topical exhibitions; the professional staff maintains collections of over 24 million specimens and objects that provide the basis for the museum’s scientific-research programs.
These collections include the full range of existing biodiversity, meteorites and rich anthropological collections and cultural artifacts from around the globe. The museum's library, which contains over 275,000 books and photo archives focused on biological systematics, evolutionary biology, archaeology and material culture, supports the museum’s academic-research faculty and exhibit development; the academic faculty and scientific staff engage in field expeditions, in biodiversity and cultural research on every continent, in local and foreign student training, in stewardship of the rich specimen and artifact collections. They work in close collaboration with public programming exhibitions and education initiatives; the Field Museum and its collections originated from the 1893 World’s Columbian Exposition and the artifacts displayed at the fair. In order to house for future generations the exhibits and collections assembled for the Exposition, Edward Ayer convinced the merchant Marshall Field to fund the establishment of a museum.
Titled the Columbian Museum of Chicago in honor of its origins, the Field Museum was incorporated by the State of Illinois on September 16, 1893, for the purpose of the "accumulation and dissemination of knowledge, the preservation and exhibition of artifacts illustrating art, archaeology and history." The Columbian Museum of Chicago occupied the only building remaining from the World's Columbian Exposition in Jackson Park, the Palace of Fine Arts. It is now home to the Chicago Museum of Industry. In 1905, the museum's name was changed to the Field Museum of Natural History to honor its first major benefactor and to reflect its focus on the natural sciences. During the period from 1943 to 1966, the museum was known as the Chicago Natural History Museum. In 1921, the Museum moved from its original location in Jackson Park to its present site on Chicago Park District property near downtown. By the late 1930s the Field had emerged as one of the three premier museums in the United States, the other two being the American Museum of Natural History in New York and the National Museum of Natural History at the Smithsonian Institution in Washington DC.
The museum has maintained its reputation through continuous growth, expanding the scope of collections and its scientific research output, in addition to the its award-winning exhibitions, outreach publications, programs. The Field Museum is part of Chicago’s lakefront Museum Campus that includes the John G. Shedd Aquarium and the Adler Planetarium. In 2015, it was reported that an employee had defrauded the museum of $900,000 over a seven-year period to 2014. Animal exhibitions and dioramas such as Nature Walk, Mammals of Asia, Mammals of Africa that allow visitors an up-close look at the diverse habitats that animals inhabit. Most notably featured are the infamous man-eating lions of Tsavo. Evolving Planet follows the evolution of life on Earth over 4 billion years; the exhibit showcases fossils of single-celled organisms, Permian synapsids, extinct mammals, early hominoids. The Field Museum's non-mammalian synapsid collection consists of over 1100 catalogued specimens, including 46 holotypes.
The collection of basal synapsids includes 29 holotypes of caseid, edaphosaurid and sphenacodontid species - 88% of catalogued specimens. Inside Ancient Egypt offers a glimpse into. Twenty-three human mummies are on display as well as many mummified animals; the exhibit features a three-story replica of the mastaba tomb of the son of Unas. Displayed are: an ancient marketplace showing artifacts of everyday life, a shrine to the cat goddess Bastet, dioramas showing the afterlife preparation process for the dead; the Ancient Americas displays 13,000 years of human ingenuity and achievement in the Western Hemisphere, where hundreds of diverse societies thrived long before the arrival of Europeans. In this large permanent exhibition visitors can learn the epic story of the peopling of these continents, from the Arctic to the tip of South America. Cultural exhibitions include sections on Tibet and China, where visitors can view traditional clothing. There is an exhibit on life in Africa, where visitors can learn about the many different cultures on the continent, an exhibit where visitors may "visit" several Pacific Islands.
The museum houses an authentic 19th century Māori Meeting House, Ruatepupuke II, from Tokomaru Bay, New Zealand. The Grainger Hall of Gems and its large collection o
The Pacific Ocean is the largest and deepest of Earth's oceanic divisions. It extends from the Arctic Ocean in the north to the Southern Ocean in the south and is bounded by Asia and Australia in the west and the Americas in the east. At 165,250,000 square kilometers in area, this largest division of the World Ocean—and, in turn, the hydrosphere—covers about 46% of Earth's water surface and about one-third of its total surface area, making it larger than all of Earth's land area combined; the centers of both the Water Hemisphere and the Western Hemisphere are in the Pacific Ocean. The equator subdivides it into the North Pacific Ocean and South Pacific Ocean, with two exceptions: the Galápagos and Gilbert Islands, while straddling the equator, are deemed wholly within the South Pacific, its mean depth is 4,000 meters. The Mariana Trench in the western North Pacific is the deepest point in the world, reaching a depth of 10,911 meters; the western Pacific has many peripheral seas. Though the peoples of Asia and Oceania have traveled the Pacific Ocean since prehistoric times, the eastern Pacific was first sighted by Europeans in the early 16th century when Spanish explorer Vasco Núñez de Balboa crossed the Isthmus of Panama in 1513 and discovered the great "southern sea" which he named Mar del Sur.
The ocean's current name was coined by Portuguese explorer Ferdinand Magellan during the Spanish circumnavigation of the world in 1521, as he encountered favorable winds on reaching the ocean. He called it Mar Pacífico, which in both Portuguese and Spanish means "peaceful sea". Important human migrations occurred in the Pacific in prehistoric times. About 3000 BC, the Austronesian peoples on the island of Taiwan mastered the art of long-distance canoe travel and spread themselves and their languages south to the Philippines and maritime Southeast Asia. Long-distance trade developed all along the coast from Mozambique to Japan. Trade, therefore knowledge, extended to the Indonesian islands but not Australia. By at least 878 when there was a significant Islamic settlement in Canton much of this trade was controlled by Arabs or Muslims. In 219 BC Xu Fu sailed out into the Pacific searching for the elixir of immortality. From 1404 to 1433 Zheng He led expeditions into the Indian Ocean; the first contact of European navigators with the western edge of the Pacific Ocean was made by the Portuguese expeditions of António de Abreu and Francisco Serrão, via the Lesser Sunda Islands, to the Maluku Islands, in 1512, with Jorge Álvares's expedition to southern China in 1513, both ordered by Afonso de Albuquerque from Malacca.
The east side of the ocean was discovered by Spanish explorer Vasco Núñez de Balboa in 1513 after his expedition crossed the Isthmus of Panama and reached a new ocean. He named it Mar del Sur because the ocean was to the south of the coast of the isthmus where he first observed the Pacific. In 1519, Portuguese explorer Ferdinand Magellan sailed the Pacific East to West on a Spanish expedition to the Spice Islands that would result in the first world circumnavigation. Magellan called the ocean Pacífico because, after sailing through the stormy seas off Cape Horn, the expedition found calm waters; the ocean was called the Sea of Magellan in his honor until the eighteenth century. Although Magellan himself died in the Philippines in 1521, Spanish Basque navigator Juan Sebastián Elcano led the remains of the expedition back to Spain across the Indian Ocean and round the Cape of Good Hope, completing the first world circumnavigation in a single expedition in 1522. Sailing around and east of the Moluccas, between 1525 and 1527, Portuguese expeditions discovered the Caroline Islands, the Aru Islands, Papua New Guinea.
In 1542–43 the Portuguese reached Japan. In 1564, five Spanish ships carrying 379 explorers crossed the ocean from Mexico led by Miguel López de Legazpi, sailed to the Philippines and Mariana Islands. For the remainder of the 16th century, Spanish influence was paramount, with ships sailing from Mexico and Peru across the Pacific Ocean to the Philippines via Guam, establishing the Spanish East Indies; the Manila galleons operated for two and a half centuries, linking Manila and Acapulco, in one of the longest trade routes in history. Spanish expeditions discovered Tuvalu, the Marquesas, the Cook Islands, the Solomon Islands, the Admiralty Islands in the South Pacific. In the quest for Terra Australis, Spanish explorations in the 17th century, such as the expedition led by the Portuguese navigator Pedro Fernandes de Queirós, discovered the Pitcairn and Vanuatu archipelagos, sailed the Torres Strait between Australia and New Guinea, named after navigator Luís Vaz de Torres. Dutch explorers, sailing around southern Africa engaged in discovery and trade.
In the 16th and 17th centuries Spain considered the Pacific Ocean a mare clausum—a sea closed to other naval powers. As the only known entrance from the Atlantic, the Strait of Magellan was at times patrolled by fleets sent to prevent entrance of non-Spanish ships. On the western side of the Pacific Ocean the Dutch threatened the Spanish Philippines; the 18th cen
Nicolás Remigio Aurelio Avellaneda Silva was an Argentine politician and journalist, president of Argentina from 1874 to 1880. Avellaneda's main projects while in office were banking and education reform, leading to Argentina's economic growth; the most important events of his government were the Conquest of the Desert and the transformation of the City of Buenos Aires into a federal district. Born in San Miguel de Tucumán, his mother moved with him to Bolivia after the death of his father, Marco Avellaneda, during a revolt against Juan Manuel de Rosas, he studied law without graduating. Back at Tucumán he founded El Eco del Norte, moved to Buenos Aires in 1857, becoming director of the El Nacional and editor of El Comercio de la Plata, he finished his studies at Buenos Aires. Sarmiento helped him to become teacher of economy at the University of Buenos Aires, he wrote "Estudio sobre las leyes de tierras públicas", proposing to give the lands to producers that make production from them. This system, similar to the one employed at the United States, suggested to reduce bureaucracy and pointed that this would allow stable populations and population growth.
He was a member of the house of representatives in 1859 and Minister of Government of Adolfo Alsina in the Buenos Aires province in 1866. During Domingo Faustino Sarmiento's presidency, he was Minister of Education, he implemented the educational reform, defining of his government. Avellaneda attained the presidency in 1874 but had its legitimacy contested by Bartolomé Mitre and supported by Domingo Faustino Sarmiento. Mitre was defeated by Julio Argentino Roca. Mitre was held prisoner and judged by military justice, but Avellaneda indulted him in order to promote pacification, he included Rufino de Elizalde and José María Gutiérrez, supporters of Mitre, as members of his cabinet. In line with people like Alberdi or Sarmiento, who thought that European immigration was crucial to the Argentine development, he promoted the "Avellaneda law" that allowed European farmers ease to get terrains; the immigration numbers were doubled in a few years. Having won the revolution and bringing peace to the country, Avellaneda faced the serious economic crisis, centering his efforts on the control of the land with the Conquest of the Desert and expanding the railroads, the cereal and meat exports, the European immigration, specially to Patagonia.
During his presidency, the economy of Argentina was affected by the European crisis putting the country on the edge of debt default. Deciding to take Argentina from its debts, he said that "there are two million Argentines who would economize to their hunger and thirst to fulfill the promises of our public commitments in the foreign markets", he applied a weak protectionism. The crisis was fixed with the growing exports of refrigerated meat to Europe, a new developing industrial method of the time. A prolific writer, his works have been published in 12 volumes. Aged 37, he was the youngest Argentine president elected, he had served in the Argentine Senate for five months in 1874 and returned to the Senate in 1883 until his death. He died on a ship returning from medical treatment in France. Mendelevich, Pablo. El Final. Buenos Aires: Ediciones B. ISBN 978-987-627-166-0. Nicolás Avellaneda at Find a Grave
A census is the procedure of systematically acquiring and recording information about the members of a given population. The term is used in connection with national population and housing censuses; the United Nations defines the essential features of population and housing censuses as "individual enumeration, universality within a defined territory and defined periodicity", recommends that population censuses be taken at least every 10 years. United Nations recommendations cover census topics to be collected, official definitions and other useful information to co-ordinate international practice; the word is of Latin origin: during the Roman Republic, the census was a list that kept track of all adult males fit for military service. The modern census is essential to international comparisons of any kind of statistics, censuses collect data on many attributes of a population, not just how many people there are. Censuses began as the only method of collecting national demographic data, are now part of a larger system of different surveys.
Although population estimates remain an important function of a census, including the geographic distribution of the population, statistics can be produced about combinations of attributes e.g. education by age and sex in different regions. Current administrative data systems allow for other approaches to enumeration with the same level of detail but raise concerns about privacy and the possibility of biasing estimates. A census can be contrasted with sampling in which information is obtained only from a subset of a population. Modern census data are used for research, business marketing, planning, as a baseline for designing sample surveys by providing a sampling frame such as an address register. Census counts are necessary to adjust samples to be representative of a population by weighting them as is common in opinion polling. Stratification requires knowledge of the relative sizes of different population strata which can be derived from census enumerations. In some countries, the census provides the official counts used to apportion the number of elected representatives to regions.
In many cases, a chosen random sample can provide more accurate information than attempts to get a population census. A census is construed as the opposite of a sample as its intent is to count everyone in a population rather than a fraction. However, population censuses rely on a sampling frame to count the population; this is the only way to be sure that everyone has been included as otherwise those not responding would not be followed up on and individuals could be missed. The fundamental premise of a census is that the population is not known and a new estimate is to be made by the analysis of primary data; the use of a sampling frame is counterintuitive as it suggests that the population size is known. However, a census is used to collect attribute data on the individuals in the nation; this process of sampling marks the difference between historical census, a house to house process or the product of an imperial decree, the modern statistical project. The sampling frame used by census is always an address register.
Thus it is not known how many people there are in each household. Depending on the mode of enumeration, a form is sent to the householder, an enumerator calls, or administrative records for the dwelling are accessed; as a preliminary to the dispatch of forms, census workers will check any address problems on the ground. While it may seem straightforward to use the postal service file for this purpose, this can be out of date and some dwellings may contain a number of independent households. A particular problem is what are termed'communal establishments' which category includes student residences, religious orders, homes for the elderly, people in prisons etc; as these are not enumerated by a single householder, they are treated differently and visited by special teams of census workers to ensure they are classified appropriately. Individuals are counted within households and information is collected about the household structure and the housing. For this reason international documents refer to censuses of housing.
The census response is made by a household, indicating details of individuals resident there. An important aspect of census enumerations is determining which individuals can be counted from which cannot be counted. Broadly, three definitions can be used: de facto residence; this is important to consider individuals who have temporary addresses. Every person should be identified uniquely as resident in one place but where they happen to be on Census Day, their de facto residence, may not be the best place to count them. Where an individual uses services may be more useful and this is at their usual, or de jure, residence. An individual may be represented at a permanent address a family home for students or long term migrants, it is necessary to have a precise definition of residence to decide whether visitors to a country should be included in the population count. This is becoming more important as students travel abroad for education for a period of several years. Other groups causing problems of enumeration are new born babies, people away on holiday, people moving home around census day, people without a fixed address.
People having second homes because of working in another part of the country or retaining a holiday cottage are dif
National Institute of Statistics and Census of Argentina
National Statistics and Censuses Institute is the Argentine government agency responsible for the collection and processing of statistical data. The institute analyses economic and social indicators such as inflation rate, consumer price index and unemployment, among others; the INDEC is supervised by different federal agencies, is under the direct oversight of the Secretaría de Programación Económica y Regional of the Ministerio de Economía y Producción. The INDEC coordinates the Sistema Estadístico Nacional through which the national and local statistical services work together; each provincial government has a statistics bureau called Dirección de Estadística, that collects and processes information. The Argentine Constitution does not provide for a national census; these were conducted only generationally until 1947, every decade since then. National censuses were taken in 1869, 1895, 1914, 1947, 1960, 1970, 1980, 1991, 2001, 2010. Demographic and economic information is permanently updated with off-year censuses, such as the Economic and Agricultural Censuses, the sampled surveys published in Encuesta Permanente de Hogares.
Monthly releases include figures on inflation, trade balances, industrial production, retail sales, GDP. The first national statistics' centre was the Dirección General de Estadística, established in 1894 as a division of the Ministry of Public Finances. Fifty years in 1944, the Consejo Nacional de Estadística y Censos was created, with dependencies on both the Ministry of the Interior and the National Presidential Office. Other agencies were formed in 1950, 1952, 1956 before the final creation of the Instituto Nacional de Estadística y Censos in 1968 by Law 17622 and Decrees 3110/70 and 1831/93; the bureau's headquarters are located in a downtown, rationalist building designed by Arturo Dubourg, commissioned by President Juan Perón for use as the Ministry of Labour, completed in 1956. Although nominally independent, INDEC is subject to strong political pressure from the government, its statistics are no longer considered trustworthy; because INDEC's statistics have been reported as being manipulated by the Kirchner government, it is considered "discredited".
Controversy arose when the government of President Néstor Kirchner replaced Graciela Bevacqua, the Consumer Prices Indicator director. Bevacqua is reported to have arrived at a consumer price increase figure of 2.0% for January 2007 from internal data but the rate reported to the public was 1.1%. The head of INDEC resigned in March, a new board of directors led by Ana María Edwin was installed by the Ministry of Economy. A group of employees protested publicly at what they saw as a violation of INDEC's autonomy, an attempt by the Economy Ministry under Felisa Miceli to illegally keep inflation indicators under one percent a month. Prosecutors gathered evidence that high government officials had inquired of statistical staff how to get lower inflation numbers, that in early 2007 managers of the price indexes had excluded products whose prices had risen more than 15% in the survey and changed price data after it came in from the field workers. Prices and the official record have continued to part ways since former Commerce Secretary Guillermo Moreno's decision to intervene in the statistics institute in 2007.
Private-sector economists and statistical offices of provincial governments show inflation two to three times higher than INDEC's number. Unions, including those from the public sector, use these independent estimates when negotiating pay rises. Surveys by Torcuato di Tella University show inflation expectations running at 25-30%. Since INDEC's headline inflation statistics have been lower than estimates from analysts in the private sector and lower than INDEC's implicit private consumption price index, incorporated in the measurement of real GDP. Taken from the first quarter of 2007, each index has read as follows: The discrepancy has led to exchanged accusations of politically motivated statistical legerdemain between the ruling party and most of the political opposition, on both left and right. Officials facing election have an incentive to understate the headline CPI figure. Opposition figures relied on estimates made by figures such as Orlando Ferreres; the practice yielded the ruling party no political benefit, helped contribute to their loss in the October 2009 mid-term elections.
An alternative explanation for the policy could rest on government finances: the national government has issued around US$100 billion in government bonds. Payments on US$50 billion of this are indexed to inflation. Other government bonds are tied in value to GDP growth. A 7-point underestimate in inflation could save the Central Bank of Argentina US$3 billion in inflation-indexed interest payments, while higher economic growth would cost added interest on bonds tied to GDP. Since 2007, when Guillermo Moreno, the secretary of internal trade
Córdoba Province, Argentina
Córdoba is a province of Argentina, located in the center of the country. Neighboring provinces are: Santiago del Estero, Santa Fe, Buenos Aires, La Pampa, San Luis, La Rioja and Catamarca. Together with Santa Fe and Entre Ríos, the province is part of the economic and political association known as the Center Region. Córdoba is the second most populous Argentine province, with 3,308,876 inhabitants, the fifth by size, at about 165,321 km2. 41% of its inhabitants reside in the capital city, Córdoba, its surroundings, making it the second most populous metro area in Argentina. Before the Spanish conquista the region now called Córdoba Province was inhabited by indigenous groups, most notably the Comechingones and Sanavirones. Once settled in Alto Perú, the Spaniards searched for a route to the Río de la Plata port in the Atlantic Ocean to transport the Peruvian gold and silver to Europe. Córdoba de la Nueva Andalucía was founded as a middle point on that route on July 6, 1573 by Jerónimo Luis de Cabrera.
The Colegio Convictorio de Nuestra Señora de Monserrat was founded by the Jesuits in 1599, followed by the National University of Córdoba, Argentina's first university, in 1613. The city continued to grow as an important cultural center, supported by the trade of precious metals from Peru. In 1761 a printing press was installed in the University. In 1783, seven years after the consolidation of the Viceroyalty of the Río de la Plata, the Intendency of Córdoba became the capital of what now includes the La Rioja, San Juan and San Luis Province, dividing the former Tucumán Intendency in two. Rafael de Sobremonte was its first governor. After the May Revolution in 1810, Governor Juan Gutiérrez de la Concha joined a meeting that decided to ignore the authority of the Buenos Aires Junta. Francisco Ortiz de Ocampo attacked the city and executed the leaders of the opposition, among whom was Santiago de Liniers, leader of the resistance during the British invasions of the Río de la Plata. Led by Juan Bautista Bustos after 1820, Córdoba struggled for control of the Nation with Buenos Aires.
Córdoba sought a federal organization of the provinces while Rivadavia pushed for a centralised government in Buenos Aires. For 15 years the province was submerged in internal revolts that started to stabilize in 1868 under the provisional government of Félix de la Peña. During the presidency of Sarmiento an astronomic observatory and the Faculty of Physical Sciences and Mathematics were inaugurated; the creation of the railways and the consequent immigration brought a second wave of population growth to Córdoba. From 1887 on, several agricultural colonies emerged, while former rest-point Fraile Muerto and Los Luceros, on the route to Buenos Aires, became agricultural and industrial centers, respectively; the University Reform movement, which originated in Córdoba in 1918, was influential not only in Argentina but throughout South America. Modernization of the curricular contents and the improvement of the students' rights were the main achievements of the movement and in Córdoba, were enacted by Governor Amadeo Sabattini, who became Argentina's most progressive governor at the time and enacted civil and land reforms that would set the national standard.
After World War II, many foreign workers and workers from other provinces in Argentina were seduced by Córdoba's industrial development, led by the expansion of the car industry. It was during Arturo Frondizi's presidency that most new auto industries settled in the city of Córdoba and its surroundings; as in the rest of the country, Peronist groups emerged in 1955 following the coup that removed Juan Perón from office. These Peronist groups, together with other socialist and anarchist groups, began opposing Argentina's third military dictatorship that began in 1966. Worker and student participation in politics grew due to the widespread discontent with the appointed governor's hard-line stance, culminating in the violent May, 1969, popular revolt known as the Cordobazo; this revolt, mirrored by the Rosariazo and others in several parts of the country, undermined the power of dictator Juan Carlos Onganía and led to his ouster by more moderate military factions. Córdoba has continued to prosper, despite left-wing violence in 1973, right-wing political interference in 1974, government atrocities in 1976–77, 1978–81 free trade policies that battered Córdoba's sizable industrial sector, the 1980s debt crisis and, the recent acute financial crisis that ended in 2002.
Córdoba, located just north of the geographical center of the nation, is Argentina's fifth largest province. The main feature of the province is the presence of an extensive plain covering the eastern two thirds of the province, the existence of three major mountain ranges which, are known as Sierras de Córdoba: the easternmost range starts just west of the city of Córdoba and reaches altitudes of around 1,000 meters in the southern portion, over 1,500 meters further north, with a maximum altitude of 1,950 meters at Cerro Uritorco. West of this chain, two valleys contain most of the tourist spots in the province: the Calamuchita valley in the south, the Punilla Valley in the north, home of scenic towns such as Villa Carlos Paz, Cosquín, La Cumbre and La Falda. West of these valleys, the Sierras Grandes form the highest chain in the province: their altitude increases to form a plateau of 2,000 to 2,300 meters