Western Interior Seaway
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The Western Interior Seaway was a large inland sea that existed roughly over the present-day Great Plains of North America, splitting the continent into two major landmasses, Laramidia to the west and
A broken concretion with fossils inside; late Cretaceous Pierre Shale near Ekalaka, Montana.
Monument Rocks (Kansas), located 25 miles south of Oakley.
Artist's impression of a Cretoxyrhina and two Squalicorax circling a dead Claosaurus in the Western Interior Seaway
Inoceramus, an ancient bivalve from the Cretaceous of South Dakota.
Borealopelta
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Borealopelta is an extinct genus of herbivorous nodosaurid ankylosaur from the Lower Cretaceous of what is today Alberta, Canada. It contains a single species, B. markmitchelli, named in 2017 by Caleb
Western Interior Seaway
…platyurus in the Rocky Mountain Dinosaur Resource Center in Woodland Park, Colorado Inoceramus, an ancient bivalve from the Cretaceous of South Dakota. Borealopelta's holotype specimen, an exceptionally well-preserved specimen that was fossilized in the Western Interior Seaway. See also Geology of the Bryce Canyon…
Nodosaur
Side view of its display case at the museum.
Specimen from the right side