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FairHead_and_dyke

Fair Head and North Star Dyke

Fair Head, in the background, is an exposed volcanic sill made of dolerite. That this whole area was subject ot intrusive vulcanicity is witnessed by the fact that the foreground shows a dyke - the North Star Dyke, as it is oriented to the north. Both of these features were caused about 60 million years ago when Europe and North America split apart.