Champsosaurus laramiensis Brown, 1905

Cervical (Neck) Vertebra

                    Anterior                                             Lateral

                Ventral                                         Dorsal

Remarks

• Collection of:  Lee Duchouquette
• Formation:     Montana Group, Hell Creek Formation
• Location:        Eastern Montana

General Info

Synonyms (older names and misidentifications in the literature)

• 1881 ?Champsosaurus australis Cope

• 1882 ?Champsosaurus puercensis Cope

• 1882 ?Champsosaurus saponensis Cope

• 1905 Champsosaurus laramiensis Brown

• 1972 Champsosaurus laramiensis Brown; Erickson

Stratigraphic Occurrence

• Tertiary Tullock (listed as Paleocene, probably actually Eocene) Formation of Northwestern Montana
• Uppermost Montana Group, Hell Creek Formation of Eastern Montana
• Maastrichtian Frenchman Formation of Saskatchewan, Canada

Age

• Champsosaurus laramiensis Brown ranges from about the uppermost Maastrichtian Stage of the Cretaceous Period into early Tertiary (into the Paleocene or Eocene Epoch) time (~66-52 mya).

Geographic Occurrence (by no means an all-inclusive list)

• Garfield County, MT
• Saskatchewan, Canada

Remarks

         For identification and descriptions, see:

• Erickson, B. R.  1972.  The Lepidosaurian Reptile Champsosaurus in North America.  Science Museum of Minnesota, Volume 1:  Paleontology, Monograph.
• Williston, S. W.  1914.  Water Reptiles of the Past and Present.  Chicago:  University of Chicago Press.  The electronic reprint of Williston's book is available for free viewing at Herper E-books. *link dead on last check 07/31/08