Western Interior Seaway

Western Interior Seaway during the mid-Cretaceous, about 100 million years before the present

The Western Interior Seaway [1] was a huge inland sea. It split North America into two halves for most of the mid- and late-Cretaceous Period. It was up to 2,500 feet (760 m) deep, 600 miles (970 km) wide and over 2,000 miles (3,200 km) long.

  1. also called the Cretaceous Seaway, the Niobraran Sea, and the North American Inland Sea

Western Interior Seaway

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