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The map of North America with the Western Interior Seaway during the Campanian. 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 split the continent of North America into two landmasses for 34 million years.
In the Late Cretaceous, the hadrosaurs, ankylosaurs, and ceratopsians experienced success in Asiamerica (Western North America and eastern Asia). Tyrannosaurs dominated the large predator niche in North America. [4] They were also present in Asia, although were usually smaller and more primitive than the North American varieties. [4]
Therizinosaurs such as Falcarius are also known from the Early Cretaceous of North America. Finally, during the Late Cretaceous Period, dinosaurs continued to diversify, with the Cenomanian stage seeing the rise of hadrosaurs such as Eolambia, and Protohadros, as well tyrannosaurs such as Moros intrepidus, which would eventually replace the ...
Map of North America During the Late Cretaceous. During the Cretaceous, the present North American continent was isolated from the other continents. In the Jurassic, the North Atlantic already opened, leaving a proto-ocean between Europe and North America. From north to south across the continent, the Western Interior Seaway started
Map of the Hell Creek and Lance Formations in western North America The Hell Creek Formation in Montana overlies the Fox Hills Formation and underlies the Fort Union Formation , and the boundary with the latter occurs near the Cretaceous–Paleogene boundary (K–Pg), which defines the end of the Cretaceous period and has been dated to 66 ± 0. ...
North America during the Campanian. Laramidia was an island continent that existed during the Late Cretaceous period (99.6–66 Ma), when the Western Interior Seaway split the continent of North America in two. In the Mesozoic era, Laramidia was an island land mass separated from Appalachia to the east by the Western Interior Seaway.
Cretaceous: North America: Mexico: Coahuila: Walcott-Rust quarry: Rust Formation: Late Ordovician: North America: US: New York [Note 1] Schoonmaker Reef and Soldiers' Home Reef: Silurian: North America: US: Wisconsin: Reefs (the first discovered in North America) Como Bluff: Sundance Formation: Late Jurassic: North America: US: Wyoming: Path 15 ...
During the Late Cretaceous the Gulf of Mexico had expanded through North America until reaching Alaska. [70] Up to half of the continent's modern surface area may have been submerged by this sea. [72] This is called the Western Interior Seaway. [73]