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.