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image: Blackslee Dyke in second quarry; hard rib of massive feldsparphyric dolerite to left of tree rooted in scree at foot of face; rotten weathered dolerite builds left-hand face; light-coloured sandstone on extreme right.
Blackslee Dyke in second quarry; hard rib of massive feldsparphyric dolerite to left of tree rooted in scree at foot of face; rotten weathered dolerite builds left-hand face; light-coloured sandstone on extreme right.
 
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