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Most of the surviving structure consists of earthworks, known as the dykes. A massive ditch and external bank henge 421m in diameter and 1.35km in circumference encloses an area of 11.5 hectares (28.5 acres). The only known comparable sites of similar date (Stonehenge and Flagstones in Dorset) are only a quarter of the size of Avebury. The ditch alone was 21m wide and 11m deep with its primary fill carbon dated to between 3304 and 2625 cal BC. However, excavation of the bank has demonstrated that it was enlarged at one stage in its lifetime, presumably using material excavated from the ditch. The fill at the bottom of the final ditch would therefore postdate an earlier, shallower ditch.
Within the henge is a great Outer Circle constituting prehistory's largest stone circle. It was probably built around four or five centuries after the earthworks. There were originally 98 sarsen standing stones some weighing in excess of 40 tons. They varied in height from 3.6m to 4.2m for the examples at the north and south entrances. Nearer the middle of the monument are two other, separate stone circles. The Northern inner ring measures 98m in diameter although only of two of its standing stones remain with two further, fallen ones. A cove of three stones stood in the middle, its entrance pointing north east.
The Southern inner ring was 108m in diameter. Almost all of it has been destroyed with sections of its arc now beneath the village buildings. A single large monolith, 5.5m high, stood in the centre along with an alignment of smaller stones until they were destroyed in the eighteenth century.
A third, timber circle, of two concentric rings, identified through geophysical surveyGeophysical survey is a form of archaeological survey, aimed at confirming an archaeological site and giving guidance to later excavation where surface signs are obscure. It is rarely used to find sites as it is time-consuming and narrow compared to other may also have stood in the north east of the outer circle although this has yet to be tested by excavationSouthwark, London by the Museum of London Excavation is the best-known and most commonly used technique within the science of archaeology. Individual excavations are normally referred to simply as "digs" by those who participate, this being an over-litera. A ploughed-out barrow is also visible from the air in the north western quadrant.
The henge had four entrances, two opposing ones on a north north west- south south east line and two on an east north east- west south west line.
Many of the original stones were destroyed from the 16th century15th century 16th century 17th century more centuries) As a means of recording the passage of time, the 16th century was that century which lasted from 1501 to 1600. Events Beginning of the " Little Ice Age" a cooling period that resulted in lower crop yi onwards to provide local building materials and make room for agriculture. Both John AubreyJohn Aubrey ( March 12, 1626 June, 1697) was an English antiquary and writer, best known as the author of a work usually referred to as Brief Lives''. He was born at Maston Pierse or Percy, near Malmesbury, Wiltshire, of a wealthy and famous family of the and later, William StukeleyWilliam Stukeley ( November 7, 1687 March 3, 1765) was an English antiquary who pioneered the archaeological investigation of Stonehenge and Avebury. He was born at Holbeach in Lincolnshire, the son of a lawyer. After taking his M. degree at Corpus Christ visited the site and described the destruction. Stukeley spent much of the 1720sEvents and Trends Manufacture of the earliest surviving pianos. World leaders Louis XV King of France (king from 1715 to 1774) George I King of Great Britain (king from 1714 to 1727) George II King of Great Britain (king from 1727 to 1760) 1720s. recording what remained of Avebury and the surrounding monuments. Without his work we would have a much poorer idea of how the site looked and especially little information on the inner rings.
Only 27 stones of the Outer Circle survive and many of these are examples re-erected by Alexander Keiller in the 1930sCenturies: 19th century 20th century 21st century Decades: 1880s 1890s 1900s 1910s 1920s 1930s 1940s 1950s 1960s 1970s 1980s Years: 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 Events and trends Technology Jet engine invented Link Trainer invented Sc. Since the early Middle Ages, people who considered them to be " pagan" attempted to bury or move them. This is famously personified by the story of the Barber surgeon of Avebury.
The former locations of the missing stones are now marked by concrete pylons and it is likely that more stones are buried on the site.
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