image: Blackslee Dyke at NE end of quarry section at Achameelan Viewpoint, Navar Forest scenic drive, Co. Fermanagh; central rib of hard dolerite with brown sand on either side marking rotten-weathered dolerite.
Blackslee Dyke at NE end of quarry section at Achameelan Viewpoint, Navar Forest scenic drive, Co. Fermanagh; central rib of hard dolerite with brown sand on either side marking rotten-weathered dolerite.
 
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