North America 77 million years ago
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.In the Late Cretaceous, the many contemporary U.S. states were beneath the waves of the Western Interior Seaway.
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