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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.
The Western Interior Seaway, was a large inland sea that started to expand in the early Cretaceous period, though geological evidence suggests it started to expand in the late Jurassic period. It existed at its fullest extent from the mid-late Cretaceous period.
Primitive hadrosauromorph. Its only known fossil specimen found appeared to have been washed into the Western Interior Seaway. It is believed to be from Appalachia because it was found closer to the Appalachia side of the sea and is unknown from Laramidia. "Coelosaurus" Upper Cretaceous: omnivore: May be synonymous with Ornithomimus. Its ...
Later the Western Interior Seaway, home to creatures such as mosasaurs and plesiosaurs, came to cover the state. On land, the duckbilled Maiasaura formed vast nesting colonies. By the end of the Cretaceous Montana was home to some of the most famous dinosaurs; creatures such as Edmontosaurus, Triceratops, and Tyrannosaurus.
Deinosuchus was present on both sides of the Western Interior Seaway. [9] Specimens have been described from 12 U.S. states: Utah, Montana, Wyoming, New Mexico, New Jersey (Marshalltown Formation), Delaware, [35] Georgia, Alabama, Mississippi, Texas, and North & South Carolina (Tar Heel/Coachman & Bladen Formations [36]).
Its location at the changing conjunction of the eastern coast of Laramidia and the adjacent western shallows of the Western Interior Seaway led to the preservation of fossils of both marine and terrestrial creatures. [13] Vertebrates include dinosaurs, pterosaurs, crocodiles, champsosaurs, lizards, snakes, turtles, frogs and salamanders.
A genus of avisaurid enantiornithine that is known from the humid low-lying swamps, lakes and river basins of the western shore of the Western Interior Seaway. †Balaur †Balaur bondoc; 70 Ma Sebes Formation, Alba County Romania An avialian from Romania †Brodavis †Brodavis americanus †Brodavis baileyi †Brodavis mongoliensis; 80.5-66 Ma
The Pierre Shale represents a period of marine deposition from the Western Interior Seaway, a shallow continental sea that submerged much of central North America during the Cretaceous. [102] At its largest, the Western Interior Seaway stretched from the Rockies east to the Appalachians, some 1,000 kilometers (620 mi) wide. At its deepest, it ...