found in rounded chalk pieces on the Northeastern beach of the island Düne<br>
Helgoland
Greater North Sea Germany
Project:
Geological Time: Cretaceous Upper Cretaceous
The specimen is photographed by Dieter Ketelsen and the material was provided by
The identification is based upon:
Bartenstein, H., Bettenstaedt, F., Bolli, H.M., 1966: