Western Inner Seaway - Artist's View - The Western Interior Seaway - The Western Interior...

Western Inner Seaway - Artist's View - The Western Interior Seaway - The Western Interior Seaway (or North American Inner Sea) seen about 75 million years ago. This sea divided the North American continent into two continents, Laramidia in the west and Appalachia in the east. This is how the Western Interior Seaway may have appeared 75 million years ago from Earth orbit. This large inland sea once divided the North American continent into two landmasses, Laramidia to the west and Appalachia to the east. Branching toward the northeast is the Hudson Seaway and to the north on the horizon are the liquid polar waters of the Labrador Seaway. At less than one - fifth the size of present day North America, the island continent of Laramidia extended from present - day Mexico to Alaska and was home to tyrannosaurs, dromaeosaurids, troodontids, hadrosaurs, ceratopsians, pachycephalosaurs, and titanosaur sauropods. The dinosaurs of Appalachia are less - understood as much of the fossil evidence was destroyed by the glaciers that alternately descended from the north and retreated starting 2.5 million years ago