The projecting white bands are thin lagoonal limestones of early Cretaceous age alternating with lagoonal shales. They have had origins at various salinities. The Purbeck beds are made of clays, shales, mudstone and limestone. In places on the cliff and shore the clay layers of the upturned rocks have been eroded away leaving the more resistant limestones.
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Added:
7th Dec 2005 by Diane Earl
Subjects:
Geography, Science
Key Stages:
Key Stage 3, Key Stage 4, Key Stage 4+
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Picture 4 of 12 -Lulworth �Types of Rock � Purbeck Beds
