Castle Rock

Castle

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Source: Kim Traynor

Copyright: CC 3.0

Castle Rock is a volcanic plug in the middle of Edinburgh upon which Edinburgh Castle sits. The rock is estimated to have risen some 350 million years ago during the lower Carboniferous period. It is the remains of a volcanic pipe which cut through the surrounding sedimentary rock before cooling to form very hard dolerite, a type of basalt. Subsequent glacial erosion was resisted by the dolerite, which protected the softer rock to the east, leaving a crag and tail formation.

Source: Wikipedia.org

Copyright: CC 3.0

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City of Edinburgh
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