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Prognathodon (Mosasauridae) found further north
From: Ben Creisler
A new online paper:
Takuya Konishi (2012)
The northernmost occurrence of Prognathodon (Squamata: Mosasauridae)
from the Western Interior Seaway of North America.
Canadian Journal of Earth Sciences (advance online publication)
The marine reptile Prognathodon (Squamata: Mosasauridae), a
mosasaurine mosasaur exhibiting a characteristically robust skull and
dentition, lived during the last two ages of the Late Cretaceous.
Fossilized remains of animals assigned to this genus are so far known
from North America, Europe, Africa, and New Zealand, indicating their
wide geographic ranges and presumed ecological and evolutionary
success. Assignable to Prognathodon, a newly discovered partial
marginal tooth from Dorothy, Alberta, Canada (51°15′48″N), extends the
geographic range of the genus by 190 km northward in the Northern
Hemisphere. Coupled with the New Zealand record of this mosasaur, the
new discovery indicates that Prognathodon likely ranged anywhere from
60°N to 60°S paleolatitude, and these reptiles may even have been
occasional inhabitants of the polar regions.