Locality	Layer
	Great Britain, England,Yorkshire, Malham, Moor Close Gill	E1
	USA, Arkansas, Independence Co., Sulphur Rock, Howards Wells	Ruddel Shale
	USA, Arkansas, Searcy Co., Yellville, SE side of Pilot Mountain	Pitkin Limestone
	USA, Oklahoma, Pontotoc Co., Highway 48, E side	Caney Shale
	USA, Texas, Llano Co., Llano River	Barnett Fm.
	USA, Texas, Llano Co., Moore Hollow area	Barnett Fm.
	USA, Texas, Mason Co., Mason, 8 mls SW of	Barnett Fm.
	USA, Texas, San Saba Co., San Saba, 2.5 mls SE of	Barnett Fm.
	USA, Texas, San Saba Co., San Saba, 7 mls E of	Barnett Fm.