Mean atmospheric O2
Geologic Time Scale
Western Interior Seaway
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.
Copyright © Walter B. Myers. All rights reserved.
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