Photo 5 (Return)

Full geological succession exposed in eroding cliffs beneath Warren Hill, Hengistbury Head, 1994. Boscombe Sand (very dark) outcrops at the toe. It is overlain by grey, sandy Barton Clay with ironstone nodules developed in the centre of the formation. Warren Hill Sands (buff-yellow) are exposed towards the top where there is a cap of Pleistocene river terrace gravels (orange-brown). At this point some 900m to the west of the Long Groyne the beach only partly protects the cliff toe so that talus removal and undercutting occur to maintain cliff instability and retreat