William Smith (geologist)
William'Strata' Smith was an English geologist, credited with creating the first nationwide geological map. At the time his map was first published. Financially ruined, Smith spent time in debtors' prison, it was only late in his life that Smith received recognition for his accomplishments, became known as the "Father of English Geology". Smith was born in the village of Churchill, the son of blacksmith John Smith, himself scion of a respectable farming family, his father died when Smith was just eight years old, he was raised by his uncle called William Smith. Although self-educated, Smith was intelligent and observant, read from an early age, showed an aptitude for mathematics and drawing. In 1787, he met and found work as an assistant for Edward Webb of Stow-on-the-Wold, Gloucestershire, a surveyor, he was quick to learn, soon became proficient at the trade. In 1791, he travelled to Somerset to make a valuation survey of the Sutton Court estate, building on earlier work in the same area by John Strachey.
He stayed in the area for the next eight years, working first for Webb and for the Somersetshire Coal Canal Company, living at Rugborne Farm in High Littleton. During this period, Smith inspected a number of coal mines in the area, where he first observed and recorded the various layers of rock and coal exposed by the mining. Smith worked at one of the estate's older mines, the Mearns Pit at High Littleton, part of the Somerset coalfield and the Somerset Coal Canal; as he observed the rock layers at the pit, he realised that they were arranged in a predictable pattern and that the various strata could always be found in the same relative positions. Additionally, each particular stratum could be identified by the fossils it contained, the same succession of fossil groups from older to younger rocks could be found in many parts of England. Furthermore, he noticed an easterly dip of the beds of rock—low near the surface higher after the Triassic rocks; this gave Smith a testable hypothesis, which he termed The Principle of Faunal Succession, he began his search to determine if the relationships between the strata and their characteristics were consistent throughout the country.
During subsequent travels, first as a surveyor for the canal company until 1799 when he was dismissed, he was continually taking samples and mapping the locations of the various strata, displaying the vertical extent of the strata, drawing cross-sections and tables of what he saw. This would earn him the name "Strata Smith"; as a natural consequence, Smith amassed a large and valuable collection of fossils of the strata he had examined himself from exposures in canals and railway cuttings and escarpments across the country. He developed methods for the identification of deposits of Fuller's earth to the south of Bath, he published his findings with many pictures from his fossil collection, enabling others to investigate their distribution and test his theories. His collection is good on Jurassic fossils he collected from the Cornbrash, Kimmeridge clay, Oxford clay, Oolitic limestone and other horizons in the sequence, they included many types of brachiopods and molluscs characteristic of the shallow seas in which they were deposited.
Some of the names he coined are still used today for this formation. In 1799 Smith produced the first large-scale geological map of the area around Somerset, he only knew how to draw the vertical extent of the rocks, but not how to display them horizontally. However, in the Somerset County Agricultural Society, he found a map showing the types of soils and vegetation around Bath and their geographical extent; the differing types were coloured. Using this technique, Smith could draw a geological map from his observations showing the outcrops of the rocks, he took a few rock each with its own colour. He estimated the boundaries of each of the outcrops of rock, filled them in with colour and ended up with a crude geological map. In 1801, he drew a rough sketch of what would become the first geological map of most of Great Britain. Smith travelled extensively across Great Britain working as a mineral surveyor allowing him to meet prominent people such as Thomas Coke, 1st Earl of Leicester, the Duke of Bedford.
In 1815 he published this geological map, based on a John Cary map. It covered the whole of England and Wales, parts of Scotland. While this was not the world's first geological map, Smith's was the first geological map covering such a large area in detail. Conventional symbols were used to mark canals, tunnels and roads, lead and tin mines, together with salt and alum works; the various geological types were indicated by different colours, applied by hand. The map is remarkably similar to modern geological maps of England, it included a ‘Sketch of the succession of STRATA and their relative Altitudes’. This geological cross-section was not a new technique in itself, but its appearance on a map, with the clear intention of illustrating the relationship between relief and rocks and their structure, was novel, he published his Delineation of the Strata of England in the same year. In another of his books Stra
In archaeology, excavation is the exposure and recording of archaeological remains. An excavation site or "dig" is a site being studied; such a site excavation concerns itself with a specific archaeological site or a connected series of sites, may be conducted over as little as several weeks to over a number of years. Numerous specialized techniques each with its particular features are used. Resources and other practical issues do not allow archaeologists to carry out excavations whenever and wherever they choose; these constraints mean. This is with the intention of preserving them for future generations as well as recognising the role they serve in the communities that live near them. Excavation involves the recovery of several types of data from a site; these data include artifacts, ecofacts and, most archaeological context. Ideally, data from the excavation should suffice to reconstruct the site in three-dimensional space; the presence or absence of archaeological remains can be suggested by remote sensing, such as ground-penetrating radar.
Indeed, grosser information about the development of the site may be drawn from this work but the understanding of finer features requires excavation though appropriate use of augering. Excavation techniques have developed over the years from a treasure hunting process to one which seeks to understand the sequence of human activity on a given site and that site's relationship with other sites and with the landscape in which it is set; the history of excavation began with a crude search for treasure and for artifacts which fell into the category of'curio'. These curios were the subject of interest of antiquarians, it was appreciated that digging on a site destroyed the evidence of earlier people's lives which it had contained. Once the curio had been removed from its context, most of the information it held was lost, it was from this realization that antiquarianism began to be replaced by archaeology, a process still being perfected. Archaeological material tends to accumulate in events. A gardener laid a gravel path or planted a bush in a hole.
A builder back-filled the trench. Years someone built a pigsty onto it and drained the pigsty into the nettle patch. Still, the original wall blew over and so on; each event, which may have taken a short or long time to accomplish, leaves a context. This layer cake of events is referred to as the archaeological sequence or record, it is by analysis of this sequence or record that excavation is intended to permit interpretation, which should lead to discussion and understanding. The prominent processual archaeologist Lewis Binford highlighted the fact that the archaeological evidence left at a site may not be indicative of the historical events that took place there. Using an ethnoarchaeological comparison, he looked at how hunters amongst the Nunamiut Iñupiat of north central Alaska spent a great deal of time in a certain area waiting for prey to arrive there, that during this period, they undertook other tasks to pass the time, such as the carving of various objects, including a wooden mould for a mask, a horn spoon and an ivory needle, as well as repairing a skin pouch and a pair of caribou skin socks.
Binford notes that all of these activities would have left evidence in the archaeological record, but that none of them would provide evidence for the primary reason that the hunters were in the area. As he remarked, waiting for animals to hunt "represented 24% of the total man-hours of activity recorded. No tools left on the site were used, there were no immediate material "byproducts" of the "primary" activity. All of the other activities conducted at the site were boredom reducers." There are two basic types of modern archaeological excavation: Research excavation – when time and resources are available to excavate the site and at a leisurely pace. These are now exclusively the preserve of academics or private societies who can muster enough volunteer labour and funds; the size of the excavation can be decided by the director as it goes on. Development-led excavation – undertaken by professional archaeologists when the site is threatened by building development. Funded by the developer meaning that time is more of a factor as well as its being focused only on areas to be affected by building.
The workforce is more skilled however and pre-development excavations provide a comprehensive record of the areas investigated. Rescue archaeology is sometimes thought of as a separate type of excavation but in practice tends to be a similar form of development-led practice. Various new forms of excavation terminology have appeared in recent years such as Strip map and sample some of which have been criticized within the profession as jargon created to cover up for falling standards of practice. There are two main types of trial excavation in professional archaeology both associated with development-led excavation: the test pit or trench and the watching brief; the purpose of trial excavations is to determine the extent and characteristics of archaeological potential in a given area before extensive excavation work is undertaken. This is conducted in development-led excavations as part of Project management planning; the main difference between Trial
The terms anno Domini and before Christ are used to label or number years in the Julian and Gregorian calendars. The term anno Domini is Medieval Latin and means "in the year of the Lord", but is presented using "our Lord" instead of "the Lord", taken from the full original phrase "anno Domini nostri Jesu Christi", which translates to "in the year of our Lord Jesus Christ"; this calendar era is based on the traditionally reckoned year of the conception or birth of Jesus of Nazareth, with AD counting years from the start of this epoch, BC denoting years before the start of the era. There is no year zero in this scheme, so the year AD 1 follows the year 1 BC; this dating system was devised in 525 by Dionysius Exiguus of Scythia Minor, but was not used until after 800. The Gregorian calendar is the most used calendar in the world today. For decades, it has been the unofficial global standard, adopted in the pragmatic interests of international communication and commercial integration, recognized by international institutions such as the United Nations.
Traditionally, English followed Latin usage by placing the "AD" abbreviation before the year number. However, BC is placed after the year number, which preserves syntactic order; the abbreviation is widely used after the number of a century or millennium, as in "fourth century AD" or "second millennium AD". Because BC is the English abbreviation for Before Christ, it is sometimes incorrectly concluded that AD means After Death, i.e. after the death of Jesus. However, this would mean that the approximate 33 years associated with the life of Jesus would neither be included in the BC nor the AD time scales. Terminology, viewed by some as being more neutral and inclusive of non-Christian people is to call this the Current or Common Era, with the preceding years referred to as Before the Common or Current Era. Astronomical year numbering and ISO 8601 avoid words or abbreviations related to Christianity, but use the same numbers for AD years; the Anno Domini dating system was devised in 525 by Dionysius Exiguus to enumerate the years in his Easter table.
His system was to replace the Diocletian era, used in an old Easter table because he did not wish to continue the memory of a tyrant who persecuted Christians. The last year of the old table, Diocletian 247, was followed by the first year of his table, AD 532; when he devised his table, Julian calendar years were identified by naming the consuls who held office that year—he himself stated that the "present year" was "the consulship of Probus Junior", 525 years "since the incarnation of our Lord Jesus Christ". Thus Dionysius implied that Jesus' incarnation occurred 525 years earlier, without stating the specific year during which his birth or conception occurred. "However, nowhere in his exposition of his table does Dionysius relate his epoch to any other dating system, whether consulate, year of the world, or regnal year of Augustus. Among the sources of confusion are: In modern times, incarnation is synonymous with the conception, but some ancient writers, such as Bede, considered incarnation to be synonymous with the Nativity.
The civil or consular year began on 1 January but the Diocletian year began on 29 August. There were inaccuracies in the lists of consuls. There were confused summations of emperors' regnal years, it is not known. Two major theories are that Dionysius based his calculation on the Gospel of Luke, which states that Jesus was "about thirty years old" shortly after "the fifteenth year of the reign of Tiberius Caesar", hence subtracted thirty years from that date, or that Dionysius counted back 532 years from the first year of his new table, it has been speculated by Georges Declercq that Dionysius' desire to replace Diocletian years with a calendar based on the incarnation of Christ was intended to prevent people from believing the imminent end of the world. At the time, it was believed by some that the resurrection of the dead and end of the world would occur 500 years after the birth of Jesus; the old Anno Mundi calendar theoretically commenced with the creation of the world based on information in the Old Testament.
It was believed that, based on the Anno Mundi calendar, Jesus was born in the year 5500 with the year 6000 of the Anno Mundi calendar marking the end of the world. Anno Mundi 6000 was thus equated with the resurrection and the end of the world but this date had passed in the time of Dionysius; the Anglo-Saxon historian the Venerable Bede, familiar with the work of Dionysius Exiguus, used Anno Domini dating in his Ecclesiastical History of the English People, completed in 731. In this same history, he used another Latin term, ante vero incarnationis dominicae tempus anno sexagesimo, equivalent to the English "before Christ", to identify years before the first year of this era. Both Dionysius and Bede regarded Anno Domini as beginning at the incarnation of Jesus, but "the distinction between Incarnation and Nativity was not drawn until the late 9th century, when in some places the Incarnation epoch was identified with Christ's conception, i.e. the Annunciation on March 25". On the continent of Europe, Anno
The Islamic, Muslim, or Hijri calendar is a lunar calendar consisting of 12 lunar months in a year of 354 or 355 days. It is used to determine the proper days of Islamic holidays and rituals, such as the annual period of fasting and the proper time for the pilgrimage to Mecca; the civil calendar of all countries where the religion is predominantly Muslim is the Gregorian calendar. Notable exceptions to this rule are Afghanistan, which use the Solar Hijri calendar. Rents and similar regular commitments are paid by the civil calendar; the Islamic calendar employs the Hijri era whose epoch was established as the Islamic New Year of 622 AD/CE. During that year and his followers migrated from Mecca to Yathrib and established the first Muslim community, an event commemorated as the Hijra. In the West, dates in this era are denoted AH in parallel with the Christian and Jewish eras. In Muslim countries, it is sometimes denoted as H from its Arabic form. In English, years prior to the Hijra are reckoned as BH.
The current Islamic year is 1440 AH. In the Gregorian calendar, 1440 AH runs from 11 September 2018 to 30 August 2019. For central Arabia Mecca, there is a lack of epigraphical evidence but details are found in the writings of Muslim authors of the Abbasid era. Inscriptions of the ancient South Arabian calendars reveal the use of a number of local calendars. At least some of these South Arabian calendars followed the lunisolar system. Both al-Biruni and al-Mas'udi suggest that the ancient Arabs used the same month names as the Muslims, though they record other month names used by the pre-Islamic Arabs; the Islamic tradition is unanimous in stating that Arabs of Tihamah and Najd distinguished between two types of months and forbidden months. The forbidden months were four months during which fighting is forbidden, listed as Rajab and the three months around the pilgrimage season, Dhu al-Qa‘dah, Dhu al-Hijjah, Muharram. Information about the forbidden months is found in the writings of Procopius, where he describes an armistice with the Eastern Arabs of the Lakhmid al-Mundhir which happened in the summer of 541 AD/CE.
However, Muslim historians do not link these months to a particular season. The Qur'an links the four forbidden months with Nasī’, a word that means "postponement". According to Muslim tradition, the decision of postponement was administered by the tribe of Kinanah, by a man known as the al-Qalammas of Kinanah and his descendants. Different interpretations of the concept of Nasī’ have been proposed; some scholars, both Muslim and Western, maintain that the pre-Islamic calendar used in central Arabia was a purely lunar calendar similar to the modern Islamic calendar. According to this view, Nasī’ is related to the pre-Islamic practices of the Meccan Arabs, where they would alter the distribution of the forbidden months within a given year without implying a calendar manipulation; this interpretation is supported by Arab historians and lexicographers, like Ibn Hisham, Ibn Manzur, the corpus of Qur'anic exegesis. This is corroborated by an early Sabaic inscription, where a religious ritual was "postponed" due to war.
According to the context of this inscription, the verb ns'’ has nothing to do with intercalation, but only with moving religious events within the calendar itself. The similarity between the religious concept of this ancient inscription and the Qur'an suggests that non-calendaring postponement is the Qur'anic meaning of Nasī’; the Encyclopaedia of Islam concludes "The Arabic system of can only have been intended to move the Hajj and the fairs associated with it in the vicinity of Mecca to a suitable season of the year. It was not intended to establish a fixed calendar to be observed." The term "fixed calendar" is understood to refer to the non-intercalated calendar. Others concur that it was a lunar calendar, but suggest that about 200 years before the Hijra it was transformed into a lunisolar calendar containing an intercalary month added from time to time to keep the pilgrimage within the season of the year when merchandise was most abundant; this interpretation was first proposed by the medieval Muslim astrologer and astronomer Abu Ma'shar al-Balkhi, by al-Biruni, al-Mas'udi, some western scholars.
This interpretation considers Nasī’ to be a synonym to the Arabic word for "intercalation". The Arabs, according to one explanation mentioned by Abu Ma'shar, learned of this type of intercalation from the Jews; the Jewish Nasi was the official. Some sources say that the Arabs followed the Jewish practice and intercalated seven months over nineteen years, or else that they intercalated nine months over 24 years. Postponement of one ritual in a particular circumstance does not imply alteration of the sequence of months, scholars agree that this did not happen. Al-Biruni says this did not happen, the festivals were kept within their season by intercalation every second or third year of a month between Dhu al-Hijjah and Muharram, he says that, in terms of the fixed calendar, not introduced until 10 AH, the first intercalation was, for example, of a month between Dhu al-Hijjah and Muharram, the second of a month between Muharram and Safar, the third of a month between Safar and Rabi'I, so on. The intercalations were arranged.
The notice of interca
In geology and related fields, a stratum is a layer of sedimentary rock or soil, or igneous rock that were formed at the Earth's surface, with internally consistent characteristics that distinguish it from other layers. The "stratum" is the fundamental unit in a stratigraphic column and forms the basis of the study of stratigraphy; each layer is one of a number of parallel layers that lie one upon another, laid down by natural processes. They may extend over hundreds of thousands of square kilometers of the Earth's surface. Strata are seen as bands of different colored or differently structured material exposed in cliffs, road cuts and river banks. Individual bands may vary in thickness from a few millimeters to a kilometer or more. A band may represent a specific mode of deposition: river silt, beach sand, coal swamp, sand dune, lava bed, etc. Geologists categorize them by the material of beds; each distinct layer is assigned to the name of sheet based on a town, mountain, or region where the formation is exposed and available for study.
For example, the Burgess Shale is a thick exposure of dark fossiliferous, shale exposed high in the Canadian Rockies near Burgess Pass. Slight distinctions in material in a formation may be described as "members". Formations are collected into "groups" while groups may be collected into "supergroups". Archaeological horizon Geologic formation Geologic map Geologic unit Law of superposition Bed GeoWhen Database
Norway the Kingdom of Norway, is a Nordic country in Northern Europe whose territory comprises the western and northernmost portion of the Scandinavian Peninsula. The Antarctic Peter I Island and the sub-Antarctic Bouvet Island are dependent territories and thus not considered part of the kingdom. Norway lays claim to a section of Antarctica known as Queen Maud Land. Norway has a total area of 385,207 square kilometres and a population of 5,312,300; the country shares a long eastern border with Sweden. Norway is bordered by Finland and Russia to the north-east, the Skagerrak strait to the south, with Denmark on the other side. Norway has an extensive coastline, facing the Barents Sea. Harald V of the House of Glücksburg is the current King of Norway. Erna Solberg has been prime minister since 2013. A unitary sovereign state with a constitutional monarchy, Norway divides state power between the parliament, the cabinet and the supreme court, as determined by the 1814 constitution; the kingdom was established in 872 as a merger of a large number of petty kingdoms and has existed continuously for 1,147 years.
From 1537 to 1814, Norway was a part of the Kingdom of Denmark-Norway, from 1814 to 1905, it was in a personal union with the Kingdom of Sweden. Norway was neutral during the First World War. Norway remained neutral until April 1940 when the country was invaded and occupied by Germany until the end of Second World War. Norway has both administrative and political subdivisions on two levels: counties and municipalities; the Sámi people have a certain amount of self-determination and influence over traditional territories through the Sámi Parliament and the Finnmark Act. Norway maintains close ties with both the United States. Norway is a founding member of the United Nations, NATO, the European Free Trade Association, the Council of Europe, the Antarctic Treaty, the Nordic Council. Norway maintains the Nordic welfare model with universal health care and a comprehensive social security system, its values are rooted in egalitarian ideals; the Norwegian state has large ownership positions in key industrial sectors, having extensive reserves of petroleum, natural gas, lumber and fresh water.
The petroleum industry accounts for around a quarter of the country's gross domestic product. On a per-capita basis, Norway is the world's largest producer of oil and natural gas outside of the Middle East; the country has the fourth-highest per capita income in the world on the World IMF lists. On the CIA's GDP per capita list which includes autonomous territories and regions, Norway ranks as number eleven, it has the world's largest sovereign wealth fund, with a value of US$1 trillion. Norway has had the highest Human Development Index ranking in the world since 2009, a position held between 2001 and 2006, it had the highest inequality-adjusted ranking until 2018 when Iceland moved to the top of the list. Norway ranked first on the World Happiness Report for 2017 and ranks first on the OECD Better Life Index, the Index of Public Integrity, the Democracy Index. Norway has one of the lowest crime rates in the world. Norway has two official names: Norge in Noreg in Nynorsk; the English name Norway comes from the Old English word Norþweg mentioned in 880, meaning "northern way" or "way leading to the north", how the Anglo-Saxons referred to the coastline of Atlantic Norway similar to scientific consensus about the origin of the Norwegian language name.
The Anglo-Saxons of Britain referred to the kingdom of Norway in 880 as Norðmanna land. There is some disagreement about whether the native name of Norway had the same etymology as the English form. According to the traditional dominant view, the first component was norðr, a cognate of English north, so the full name was Norðr vegr, "the way northwards", referring to the sailing route along the Norwegian coast, contrasting with suðrvegar "southern way" for, austrvegr "eastern way" for the Baltic. In the translation of Orosius for Alfred, the name is Norðweg, while in younger Old English sources the ð is gone. In the 10th century many Norsemen settled in Northern France, according to the sagas, in the area, called Normandy from norðmann, although not a Norwegian possession. In France normanni or northmanni referred to people of Sweden or Denmark; until around 1800 inhabitants of Western Norway where referred to as nordmenn while inhabitants of Eastern Norway where referred to as austmenn. According to another theory, the first component was a word nór, meaning "narrow" or "northern", referring to the inner-archipelago sailing route through the land.
The interpretation as "northern", as reflected in the English and Latin forms of the name, would have been due to folk etymology. This latter view originated with philologist Niels Halvorsen Trønnes in 1847; the form Nore is still used in placenames such as the village of Nore and lake Norefjorden in Buskerud county, still has the same meaning. Among other arguments in favour of the theor
Stratigraphy is a key concept to modern archaeological theory and practice. Modern excavation techniques are based on stratigraphic principles; the concept derives from the geological use of the idea that sedimentation takes place according to uniform principles. When archaeological finds are below the surface of the ground, the identification of the context of each find is vital in enabling the archaeologist to draw conclusions about the site and about the nature and date of its occupation, it is the archaeologist's role to attempt to discover what contexts exist and how they came to be created. Archaeological stratification or sequence is the dynamic superimposition of single units of stratigraphy, or contexts. Contexts are single events or actions that leave discrete, detectable traces in the archaeological sequence or stratigraphy, they can be deposits, structures, or "zero thickness surfaciques", better known as "cuts". Cuts represent actions that remove other solid contexts such as fills and walls.
An example would be a ditch "cut" through earlier deposits. Stratigraphic relationships are the relationships created between contexts in time, representing the chronological order in which they were created. One example would be the back-fill of said ditch; the temporal relationship of "the fill" context to the ditch "cut" context is such that "the fill" occurred in the sequence. A relationship, in the sequence is sometimes referred to as "higher" in the sequence, a relationship, earlier, "lower", though this does not refer to the physical location of the context, it is more useful to think of "higher" as it relates to the context's position in a Harris matrix, a two-dimensional representation of a site's formation in space and time. Archaeological stratigraphy is based on a series of axiomatic principles or "laws", they are derived from the principles of stratigraphy in geology but have been adapted to reflect the different nature of archaeological deposits. Harris notes two principles that were recognised by archaeologists by the 1970s: The principle of superposition establishes that within a series of layers and interfacial features, as created, the upper units of stratification are younger and the lower are older, for each must have been deposited on, or created by the removal of, a pre-existing mass of archaeological stratification.
The principle that layers can be no older than the age of the most recent artefact discovered within them. This is the basis for the relative dating of layers using artefact typologies, it is analogous to the geological principle of faunal succession, although Harris argued that it was not applicable to archaeology. He proposed three additional principles: The principle of original horizontality states that any archaeological layer deposited in an unconsolidated form will tend towards a horizontal deposition. Strata which are found with tilted surfaces were so deposited, or lie in conformity with the contours of a pre-existing basin of deposition; the principle of lateral continuity states that any archaeological deposit, as laid down, will be bounded by the edge of the basin of deposition, or will thin down to a feather edge. Therefore, if any edge of the deposit is exposed in a vertical plane view, a part of its original extent must have been removed by excavation or erosion: its continuity must be sought, or its absence explained.
The principle of stratigraphic succession states that any given unit of archaeological stratification exists within the stratigraphic sequence from its position between the undermost of all higher units and the uppermost of all lower units and with which it has a physical contact. Understanding a site in modern archaeology is a process of grouping single contexts together in larger groups by virtue of their relationships; the terminology of these larger clusters varies depending on the practitioner, but the terms interface, sub-group, group are common. An example of a sub-group could be the three contexts. Sub-groups can be clustered together with other sub-groups by virtue of their stratigraphic relationship to form groups, which in turn form "phases." A sub-group burial could cluster with other sub-group burials to form a cemetery, which in turn could be grouped with a building, such as a church, to produce a "phase". Phase implies a nearly contemporaneous Archaeological horizon, representing "what you would see if you went back to time X".
The production of phase interpretations is the first goal of stratigraphic interpretation and excavation. Archaeologists investigating a site may wish to date the activity rather than artifacts on site by dating the individual contexts which represents events; some degree of dating objects by their position in the sequence can be made with known datable elements of the archaeological record or other assumed datable contexts deduced by a regressive form of relative dating which in turn can fix events represented by contexts to some range in time. For example, the date of formation of a context, sealed between two datable layers will fall between the dates of the two layers sealing it; however the date of contexts fall in a range of possibilities so using them to date others is not a straightforward process. Take the hypothetical section fig A. Here we can see 12 contexts, each numbered with a unique context number and whose sequence is represented in the Harris matrix in fig B. A horizontal layer Masonry wall remnant Backfill of the wall construction trench A hor