Locality	Layer
	Great Britain, England,Devonshire, Exeter, Bonhay Road	P1a
	Great Britain, England,Yorkshire, Bolland	P1a
	Great Britain, England,Yorkshire, Malham, Black Hole	P1b
	USA, Alaska, Brooks Range, Kiligwa River, W fork of, 14153	black chert in Alapah Lst.
	USA, Indiana, Brown County, unrecorded	Visean