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This slide show presents images which show the paleogeography of the southwestern United States from 1.8 billion years ago to 10 million years ago. The slide show was originally presented at the annual meeting of the Geological Society of America in 1997. Beginning in the Precambrian, it traces the paleogeographic evolution of the region through the Tertiary. Emphasis is on the Mesozoic where two or more images of each period are shown. Two different interpretations are presented for some of the periods. One shows a tectonic interpretation in which most elements of the western U.S. were derived from North America; the second shows a tectonic interpretation in which some elements originated far from North America (exotic elements). A written narrative is also provided.
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