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| General Comments: |
Quarried in the vicinity of Frosterley on the banks of the River Wear, near Durham. Quarrying has been carried out locally since the 13th century and is claimed to have been used in Britain since Norman times. It is known to local quarrymen as 'Cockle'. |
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| Known Quarries: |
Disused quarry south of River Wear, Frosterley, Broadwood Quarry, Frosterley, Harehope Quarry, Frosterley. |
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