The theme for this month’s geoscience blog carnival, The Accretionary Wedge #9, is to discuss a significant geologic event. What event (or period, or feature) of Earth history has had an effect ...

The Western Interior Seaway expanded and receded drastically over the course of the Cretaceous period, which spanned 80 million years and ended with the mass extinction of the dinosaurs and ammonoids.

The Cretaceous Period lasted for nearly 80 million years. ... In the Late Cretaceous, for example, the Western Interior Seaway split North America into two landmasses. At its largest this sea was more ...

Parts of western Colorado were likely swampy during the Late Cretaceous period. The western part of the state was situated along the seaway's western edge, which would have included deltas ...

At the time, the continent was cut into two by the Western Interior Seaway, also known as the Cretaceous Seaway, ... Eighty million years ago, western Kansas was 'hell's aquarium.' Here's what it can ...

According to the research team, Jormungandr shares features with Clidastes, a smaller mosasaur that inhabited the Western Interior Seaway farther south, in what is today Kansas, and Mosasaurus, a ...

Toothmarks on Cretaceous bones hint that Deinosuchus hunted or scavenged dinosaurs. ... Salt tolerance would have helped Deinosuchus navigate the Western Interior Seaway that once divided North ...

After the Western Interior Seaway cleaved North America in two, the eastern half was utterly isolated for 27 million years. But its western counterpart had a neighbour – it was connected to Asia ...

CONDOS: It's hard to imagine, but 80 million years ago, this dry, desolate landscape sat beneath the waves of the Western Interior Seaway, which stretched from the Arctic Ocean to the Gulf of Mexico.

Parts of western Colorado were likely swampy during the Late Cretaceous period. The western part of the state was situated along the seaway's western edge, which would have included deltas ...

An artist's illustration shows Deinosuchus riograndensis swimming with an early alligator relative in the wetlands of the Western Interior Seaway in southwestern North America, during the Late ...