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pitchstone; green, aphyric; rounded fracture masses

Corriegills Burn (south branch), Arran [North Ayshire], [Scotland] lower part of sill, near underlying sandstone, [Palaeogene] Tyrrell/ATN label says "Ar761 pitchstone lower part of sill Pebbly conch fracture in zone of junction with underlying sandstone. Corrygills Burn [sic] ATN 1925".