Locality	Layer
	Algeria, Atlas (Algeria), Horreit Antar	Tagnana Fm., Calcaire vidange
	France, Nord-Pas-de-Calais, Valenciennes,Houillères	Homoc.undulatum horizon, pl.B
	Great Britain, England,Cheshire, Congleton Edge	H
	Great Britain, England,Devonshire, Exeter, Bonhay Road	R1
	Great Britain, England,Lancashire, Blackburn, Samlesbury Bottoms, R. Darven	Homoceras undulatum Zone (H2b)
	Great Britain, England,Yorkshire, Cowling, Gill Beck, Crosshills	H
	Great Britain, England,Yorkshire, Todmorden, Eastwood	H
	Great Britain, England,Yorkshire, Todmorden, Lambert's Clough	H
	Great Britain, England,Yorkshire, Todmorden, Woodhouse, Lumbutts Clough	R1
	Great Britain, Wales,South, Barland Comon, Gower	H2b
	Ireland, Clare Co., Lisdoonvarna	lower Clare Shales, Homoceras Z.