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Prehen Quarry
Brickkilns , County Londonderry
Basalt
Buff-Pink Sandstone
Conglomerate
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Limestone
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Greywacke
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Belfast City
County Antrim
County Armagh
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County Tyrone
County Antrim
County Armagh
County Down
County Fermanagh
County Londonderry
County Tyrone
Prehen Quarry
