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Cool Paleogeographic Maps

I came across this site this evening.  It shows the how much the geography of North America has changed throughout the major geologic periods.  I found the images fascinating.  It really puts in perspective how dynamic geological forces are, and how dramatically different the continent is in the modern era.  Looking back to when the dinosaurs lived (Cretaceous period) reveals a startlingly different landmass. Cool stuff.

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