Locality	Layer
	USA, Maryland, Allegany Grove	Chemung M., Jennings Fm.
	USA, Maryland, Oakland	Chemung M., Jennings Fm.
	USA, Maryland, Polish Mountain, Williams road	Parkhead M., Jennings Fm.
	USA, Maryland, White Sulphur Branch, NE of Pratt	Parkhead M., Jennings Fm.
	USA, New York, Tioga Co., Owego	Cayuta Shale