Isca Dumnoniorum 28 cities of Britain by the "History of the Britons" as Isca, although Ford read it as a reference to Penselwood and thought it more likely to be Lindinis (modern Ilchester). Isca was also known to the British as Caer Uisc but, after the Roman withdrawal from Britain around 410, there is very little evidence of habitation in Exeter for almost 300 years except for the remains of a building (possibly a church) in the area of the demolished forum and a few nearby graves dated to the 5th, 6th, and 7th centuries. After this, the historical record picks up
Southern England Chalk Formation name of the Western Downs is given. The Downs enclose the rich district of the Weald, where the chalk has eroded to form a much flatter landscape. In Wiltshire is Salisbury Plain, the Wiltshire Downs, and Cranborne Chase, all three famous for their archaeology, and it was on these downs that Augustus Pitt Rivers developed the methods of modern archaeological field work in the 19th century. The Berkshire Downs and White Horse Hills adjoin the northernmost part of this formation. The formation called Cranborne Chase () is a chalk plateau in central southern England, straddling the counties Dorset, Hampshire and