Amérique du nord à la fin du Crétacé

Paleogeographic maps of North America during the (A) late Campanian (,75 Ma) and (B) late Maastrichtian (,65 Ma). The Sevier Orogenic Belt is the major mountain building system in western North America during the late Campanian, but note that by the latest Maastrichtian the Laramide Orogeny creates uplift structures further to the east. Maps courtesy of Ron Blakey, Colorado Plateau Geosystems. 

Trouvé ici.