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Prehen Quarry (Q97)
off Prehen Park, Derry, Brickkilns County Londonderry
| Status | Inactive |
| Stone Type (S): | Schist |
| Rock Formation: | Ballykelly Formation/Londonderry Formation |
| Open Porosity (%): | % |
| Apparent Density (kg/dm3) : | |
| Probe Permeability (mD) : |
