Morphological variations in the ammonite Scaphites of the Blue Hill Member, Carlile Shale, Upper Cretaceous, Kansas Morphological variations in the ammonite Scaphites of the Blue Hill Member, Carlile Shale, Upper Cretaceous, Kansas
Endosiphuncular structures in Ordovician and Silurian cephalopods Endosiphuncular structures in Ordovician and Silurian cephalopods