A report on Bearpaw Formation

Contact (red arrow) between the underlying marine shales of the Bearpaw Formation and the coastal Horseshoe Canyon Formation.
Bearpaw shale being excavated to recover ammonites for ammolite production.
A specimen of Placenticeras ammolite from the Bearpaw Formation.

Geologic formation of Late Cretaceous age.

- Bearpaw Formation
Contact (red arrow) between the underlying marine shales of the Bearpaw Formation and the coastal Horseshoe Canyon Formation.

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Eastend Formation

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Stratigraphical unit of Maastrichtian age in the Western Canadian Sedimentary Basin.

Stratigraphical unit of Maastrichtian age in the Western Canadian Sedimentary Basin.

It is eroded to the north and east, where the Frenchman Formation lies directly over the Bearpaw Formation.

Paleogeography of the Campanian

Blood Reserve Formation

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Geologic formation of Late Cretaceous age in the Western Canada Sedimentary Basin.

Geologic formation of Late Cretaceous age in the Western Canada Sedimentary Basin.

Paleogeography of the Campanian

The Blood Reserve Formation rests conformably on the marine shales and siltstones of the Bearpaw Formation, and is overlain by the floodplain deposits of the St. Mary River Formation.

Dolichorhynchops

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Extinct genus of polycotylid plesiosaur from the Late Cretaceous of North America, containing three species, D. osborni, D. bonneri and D. tropicensis, as well as a questionably referred fourth species, D. herschelensis.

Extinct genus of polycotylid plesiosaur from the Late Cretaceous of North America, containing three species, D. osborni, D. bonneri and D. tropicensis, as well as a questionably referred fourth species, D. herschelensis.

Mounted skeleton of the holotype of D. osborni (from Williston, 1903), in the University of Kansas Museum of Natural History
Restoration of D. osborni
With a human to scale
Dolichorhynchops (Trinacromerum) bonneri in the Rocky Mountain Dinosaur Resource Center in Woodland Park, Colorado
Specimen in Vienna

It was discovered in the Bearpaw Formation of Saskatchewan, Canada, a Late Cretaceous (late Campanian to Maastrichtian) rock formation.

Prognathodon

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Extinct genus of marine lizard belonging to the mosasaur family.

Extinct genus of marine lizard belonging to the mosasaur family.

Restoration of P. lutugini.
Skull of P. saturator.
A close-up image of the teeth of P. solvayi.
Torso of P. saturator.
Fibrous tissues and microstructures recovered from the humerus of IRSNB 1624, an exceptionally well-preserved specimen of Prognathodon.
Skull of Prognathodon solvayi, the type species of the genus.
P. currii skull cast at the Geological Museum in Copenhagen.
Skull of P. overtoni.
A side-by-side comparison of a typical "crushing" mosasaur tooth (left, Igdamanosaurus) and a typical "cutting" mosasaur tooth (right, Mosasaurus). Teeth of Prognathodon seem to contain characteristics of both.
Restoration of P. saturator.
Restoration of P. overtoni
P. kianda skeleton at the Smithsonian Museum
Restoration of P. solvayi
Restoration of P. waiparensis

74.5 Ma) Bearpaw Formation in Alberta, Canada provided the first fully articulated skeletons of the genus.

Nakonanectes

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Elasmosaurid plesiosaur of the late Cretaceous found in 2010 the state of Montana in the United States.

Elasmosaurid plesiosaur of the late Cretaceous found in 2010 the state of Montana in the United States.

The fossil was found in the Bearpaw Formation, a late Campanian/early Maastrichtian rock, making it one of the last known elasmosaurids to have lived in the Western Interior Seaway.