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Sentinal Butte Formation Fossils

Champsosaurus gigas
Skeleton of crocodile-like champsosaur, Champsosaurus gigas, Sentinel Butte Fm., Billings Co., length 2 m. Collected from USFS -
Dakota Prairie Grasslands administered lands. North Dakota Heritage Center exhibit.

Champsosaurus gigas was an underwater predator that would lunge off the bottom after fish with its powerful back legs.
Painting by Jerome Connolly courtesy of the Science Museum of Minnesota, St. Paul.

Page Modified October 10, 2006