Laurentia Definition
lô-rĕnshə
noun
The North American craton which, according to the theory of plate tectonics, has existed since the Paleozoic Era and was once part of a supercontinent comprising present-day North America and Greenland.
American Heritage
Origin of Laurentia
After the Laurentian Shield, the continental shield underlying northeast North America that forms the nucleus of the North American continent after the Saint Lawrence River
From American Heritage Dictionary of the English Language, 5th Edition
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