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image: Doonan Quarry, Co. Fermanagh, looking SE along the trench excavation of the Doraville dyke; the newer and deeper face can be seen in the foreground; rock wall on left-hand side exposes coarser-grained, earlier dolerites.
Doonan Quarry, Co. Fermanagh, looking SE along the trench excavation of the Doraville dyke; the newer and deeper face can be seen in the foreground; rock wall on left-hand side exposes coarser-grained, earlier dolerites.
 
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