GEOLOGIC CHANGE IN WESTERN NORTH AMERICA SINCE THE AGE OF DINOSAURS. presented by the ABD Paleontology Society. The dramatic changes in the western North American (WNA) landscape are hard to imagine. None of us would recognize WNA 65 million years ago. Volcanic activity, uplift and erosion, the subduction of the ancient Farallon plate, contact between the North American and Pacific plates, crustal extension, separation of the Baja peninsula, rifting and marine water intrusion, the formation and drying of great interior lakes, sea levels rising and falling, shorelines extending to the end of the continental shelf and then re-covered by embayments, tectonic faulting and folding, and the devlopment of new river systems, such as the Colorado River, have altered the terrain completely. "For the love of dirt" Speakers Ron Blakey - Deep Time Maps and emeritus professor from Northern AZ University; Dr. Jorge Ledesma-Vazquez, emeritus professor and Geologist with the Facultad de Ciencias Marinas of the Universidad Autonoma de Baja California; Monte Marshall - emeritus professor of Geology and Geophysics from San Diego State University; Pat Abbott - emeritus professor of Geology from San Diego State University and XXXX - Jimmie Smith is contact person.

Approved