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
9:15
Yellowstone contains some of North America's most amazing fossil deposits.
9:08
Horses vanished from North America for 10,000 years until a mammal brought them back.
9:37
420 million years ago, some fish wore armor – and it may have served a surprising purpose.
7:59
In the 1800s, miners found beautifully preserved fossils of animals from the Eocene.
8:38
Insects were the first animals to fly. Scientists are still working on how it happened.
9:20
To celebrate our first anniversary together, we’d like to answer some of your questions.
6:54
Tyrannosaurus rex had tiny arms. How did this happen, and why did it keep them?
8:40
Before a group of fish could live on dry land, they acquired the ability to breathe air.
7:29
Where did viruses come from and how did they evolve? Are viruses alive?
9:07
Why the Triassic was full of creatures that look a lot like other, more modern species.