Geologic History of Western US

This presentation shows graphically the Proterozoic and Phanerozoic geologic history of the Southwestern US. The explanation shows the graphics and patterns used throughout. The presentation begins with a text file that provides a brief narrative of the geologic history. You can link to the graphics from the text; use the back_function on your browser to retun to the text from the graphics. Alternately, you can navigate through geologic time from graphic to graphic without returning to the text each time. Note that on most graphics pages you have to scroll down to see the multiple figures on a given page. From Permian through Jurassic, two different tectonic interpretations are presented. These figures were derived from many sources; however, several of the most influential to the figures are listed below.