6" Map (and quarter sheet). ?Var. of Tonstein. From 3" band lying immediately below 2" coal & at top of seat earth; coal probably member of Norton Group lying below Kilburn coal. (Lower Coal Measures).
Locality details
Blackfordby No.2 (1958) BH 445 yards 218 and a half degrees from N.W. corner of Blackfordby Church at 192' 10".