| Only in the west, on the Isle of Purbeck, did some minor southward drainage develop across the monocline. |
| A startling image shows Salisbury nave at high level from behind a glossy black Purbeck marble column and capital which dominate the foreground. |
| By contrast, also at Chelsea, Mark Gregory's stunning design to incorporate a garden home office had Purbeck stone stepping stones making a pathway over a still pool. |
| In south and east Dorset this resulted in the formation of two enormous structures, known as the Weymouth and Purbeck anticlines or upfolds. |
| The Needles, along with Old Harry Rocks on Purbeck, represent the edges of this breach. |
| The remainder is less straightforward and includes Portland and Purbeck stone, other limestones, calcareous clays and shales. |
