A general view of the Upper Purbeck from the top of the cliffs at Peveril Point, Swanage, spring 2002 (camera at about SZ 0408 7864 looking East). The rocks are folded into a synclinal structure the axis of which pitches downwards towards the camera. The Broken Shell Limestone (DB 220) forms the two main reefs at right and left (the straight-edged narrow feature at the extreme left is a concrete causeway). Successively higher resistant strata form the inner reefs; the horseshoe-like feature at the water's edge in the centre is thought to be formed by the Blue Marble (DB 244). Photo 2002-04:5.15, © John Palmer