image: Disused quarry east of Cam Lough, Co. Armagh, showing footwall of porphyritic ring-dyke, steeply dipping away from the darker coloured, Lower Palaeozoic slates.
Disused quarry east of Cam Lough, Co. Armagh, showing footwall of porphyritic ring-dyke, steeply dipping away from the darker coloured, Lower Palaeozoic slates.
 
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