Western Interior Seaway

E1145388 UNEXPLORED

The Western Interior Seaway was a vast, shallow inland sea that split North America into two landmasses during the Late Cretaceous period, hosting rich marine ecosystems and extensive sediment deposition.

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All labels observed (1)

Label	Occurrences
Western Interior Seaway canonical	2

Referenced by (2)

Full triples — surface form annotated when it differs from this entity's canonical label.

Pierre Shale → basin → Western Interior Seaway ⓘ

Western Interior Basin → contains → Western Interior Seaway ⓘ