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In page Yatton:

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The area around Yatton and Claverham, which falls within the North Somerset Levels, is a mixture of peat, estuarine alluvium and low hills of sand and gravel with, to the south the limestone ridge of Cadbury Hill, which rises to 250 feet (76 m).[1] On its summit stands an Iron Age hill fort known, in archaeological circles, as Cadbury-Congresbury in order to differentiate it from the Cadbury hillfort in South Cadbury. It appears to have been constructed in the Iron Age when one or more ramparts, with walls and ditches, were built on the steep slopes of the hill to defend an area covering some 8.5 acres (34,000 m2).[2]