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Western Interior Sea

The Western Interior Seaway (also called the Cretaceous Seaway, the Niobraran Sea, the North American Inland Sea, or the Western Interior Sea) was a large inland sea that existed roughly over the present-day Great Plains of North America, splitting the continent into two major landmasses, Laramidia to the west and Appalachia to the east, as well as Hudsonia to the north east.

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