Up Next
Back to Show
Eons
When Sharks Swam the Great Plains
Season 2
Episode 5
If you’ve ever been to, or lived in, or even flown over the central swath of North America, then you’ve seen the remnants of what was a uniquely fascinating environment. Scientists call it the Western Interior Seaway, and at its greatest extent, it ran from the Caribbean Sea to the Canadian Arctic.
Support Provided By
7:31
234 million years ago, the climate suddenly changed for the wetter.
12:34
The Cenozoic marks the rise of organisms that look a lot like us.
7:28
In 1912, a fossil collector discovered the world’s only known semi-aquatic dinosaur.
10:45
Reptiles in time grew to become some of the largest forms of life ever to exist on earth.
7:03
How did two of the same kind of animal end up looking so different?
8:05
Ancestors of cephalopods all had shells until it proved to be their biggest weakness.
11:06
The search for our origins go back to a single common ancestor.
7:19
We talk to Amy Atwater, Collections Manager at the Museum of the Rockies.
8:09
What has been observed and learned from putting dinosaur bones under a microscope.
6:25
The Sudden burst of diversity that marked the dawn of truly complex life on our planet.