Pale grey clay bed, ?tuffaceous, from 24 ft 0 in in section Stir. 11SW[11], Limestone Coal Group, 1 ft 0 in below S. 45882; cyclothem above Upper Wee Hartley Coal
Locality details
Manor Powis north (companion) mine ' to Lower Knott'; right (NE) side of mine, c. 255 ft from S end [11]