At the western end of Stair hole is a gap. This is a collapsed arch and eventually the other arches will collapse in the same way. The open gap here has caused increased erosion of the shales and limestones of the Purbeck Formation, landward of the beach. In storms the seas directly attack this.
Added:
9th Dec 2005 by Diane Earl
Subjects:
Geography, Science
Key Stages:
Key Stage 3, Key Stage 4, Key Stage 4+
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