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.
Mounted skeleton of the holotype of D. osborni (from Williston, 1903), in the University of Kansas Museum of Natural History
A specimen of Placenticeras ammolite from the Bearpaw Formation.
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

Other fossils found in this formation include many types of shellfish, bony fish, sharks, rays, birds, and marine reptiles like mosasaurs such as Prognathodon overtoni and Plioplatecarpus peckensis, plesiosaurs such as Dolichorhynchops herschelensis, Albertonectes and Nakonanectes, and sea turtles.

- Bearpaw Formation

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

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

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