Western Interior Seaway Animation. This site discusses the physiography origin evolution and biologic significance of this intriguing geologic feature. The Western Interior Seaway is an ancient intracontinental seaway that occupied much of modern western North America and existed throughout much of the Cretaceous Period.
This site discusses the physiography origin evolution and biologic significance of this intriguing geologic feature. Three Western Interior Seaway anoxic events occurred during the Cretaceous in the shallow inland seaway that divided North America in two island continents The Western Interior Seaway was a large inland sea that started to expand in the early Cretaceous period though geological evidence suggests it started Western Interior Seaway which divided North America into eastern and western. What are the time frames for the two animations.
This site discusses the physiography origin evolution and biologic significance of this intriguing geologic feature.
It existed at its fullest extent from the mid-late Cretaceous period. The Western Interior Seaway also called the Cretaceous Seaway the Niobraran Sea the North American Inland Sea and the Western Interior Sea was a large inland sea that existed during the mid- to late Cretaceous period as well as the very early Paleogene splitting the continent of North America into two landmasses Laramidia to the west and Appalachia to the east. Seven Key Time Slice maps 130 115 105 92 85 77 and 72 Ma overlap with the WIS maps. This site discusses the physiography origin evolution and biologic significance of this intriguing geologic feature.