North America 77 million years ago
Nov 8, 2022
The Cretaceous is the 3rd and final period of the Mesozoic Era geological period that continued from about 145 to 66 million years ago.
It was a geologic period with a comparatively warm climate, resulting in high eustatic sea levels that shaped many shallow inland water bodies.
Below is the map of North America 77 million years ago. According to this map, In the Late Cretaceous, the many contemporary U.S. states were beneath the waves of the Western Interior Seaway. It’s fascinating that elevations and water levels have changed that much throughout millions of years.
