Western Interior Seaway


(new Oct 2014)

The Western Interior Seaway dominated North American paleogeography during much of the Mesozoic. Beginning as a narrow body in a back arc basin along the British Columbia-Alberta border the Early Jurassic, the seaway expanded and contracted numerous times during the remaining Mesozoic. From the Cenomanian through most of the Campanian, the seaway extended from the Arctic to the Gulf of Mexico, at times covering nearly half of North America. An extensive volcanic signature in the rock record including ash beds (bentonites), detrital zircons, and local volcanic flows coupled with a robust fossil record, excellent, widespread outcrops, and voluminous subsurface data have provided the basis for basin-wide, detailed correlation.

Western Interior Seaway -- Jurassic and Cretaceous Paleogeography A sample of the detailed maps that display the transgressions and regressions of Jurassic and Cretaceous epicontinental seaways.

Global Paleogeography


The global views presented in this series show how Earth may have appeared over the last 600 million years (Ma). All views were prepared from rectangular projections drawn at a resolution of 3000x1500 pixels for each of the 26 time slices. The orthographic (spherical) and Mollweide (oval) views were wrapped using the respective projections. The geologic data was gathered from the references linked below.

Mollewide globes 27 global time slices in mollewide projection

Paleogeographic globes 26 global time slices, many with 2 or 3 views.

Paleogeographic maps in rectangular format Each of above time-slices in rectangular format. p

Global References