Geoarchaeological recording and sampling of a well-preserved sequence of buried soil horizons was undertaken during test-pitting along the line of the proposed Westbury Eastern By-pass. Postglacial colluvium 2.4m deep was recorded in test-pit 90 in the valley bottom. The sequence contained a buried soil overlying Late Glacial periglacial deposits. The Holocene sequence was recorded and samples for land snails and magnetic susceptibiliity were taken. The sequence appears to have occurred as a result of deforestation and ploughing, the basal buried soils being eroded from the slopes within the later Neolithic to earlier Bronze Age period. As a result of cultivation, colluviation continued from prehistoric times up to the medieval and post-medieval periods.