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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.
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A map of the principal hydrological divides of North America. The Eastern Continental Divide (orange line) demarcates two watersheds of the Atlantic Ocean: the Gulf of Mexico watershed and the Atlantic Seaboard watershed.
The following outline is provided as an overview of and topical guide to North America. North America is a continent [ 1 ] in the Earth 's Northern and Western Hemispheres . It is bordered on the north by the Arctic Ocean , on the east by the North Atlantic Ocean , on the southeast by the Caribbean Sea , and on the south and west by the North ...
For North America, from oldest to youngest, they are the Sauk, Tippecanoe, Kaskaskia, Absaroka, Zuñi, and Tejas sequences. Attempts to identify equivalent cratonic sequences on other continents have met with only limited success, suggesting that eustasy (total global sea-level change) is unlikely to be the sole responsible mechanism.
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The structure of the North American plate and sea level (blue line) projected over the United States of America (red line) with nutrient sourcing from volcanoes along the convergent margin, and the resulting water column stratification (green) and its extent throughout the basin (dashed green line).
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