Rocks Wikipedia

Durdle Door

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Source: Prosthetic_Head

Copyright: Creative Commons 3.0

It is privately owned by the Welds, a family who owns 12,000 acres in Dorset in the name of the Lulworth Estate. It is open to the public. The name Durdle is derived from the Old English word ‘thirl' meaning bore or drill.
The form of the coastline around Durdle Door is controlled by its geology—both by the contrasting hardnesses of the rocks, and by the local patterns of faults and folds. The arch has formed on a concordant coastline where bands of rock run parallel to the shoreline. The rock strata are almost vertical, and the bands of rock are quite narrow. Originally a band of resistant Portland limestone ran along the shore, the same band that appears one mile along the coast forming the narrow entrance to Lulworth Cove. Behind this is a 120-metre band of weaker, easily eroded rocks, and behind this is a stronger and much thicker band of chalk, which forms the Purbeck Hills. These steeply dipping rocks are part of the geological structure known as the Lulworth crumple, itself part of a broader monocline produced by the building of the Alps during the mid-Cenozoic.

Source: Wikipedia.org

Copyright: Creative Commons 3.0

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Wareham St. Martin

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