Geologic deposits and features of the Ancestral Rocky Mountains: left - Permian ss and cong derived from Ancestral Rocky Mountains, Cutler Fm, Ouray, CO; center - cyclic Pennsylvanian limestones of Paradox Basin, Mexican Hat, UT; right - Triassic and Jurassic redbeds overlie Precambrian schists on axis of Uncompahgre uplift, Colo Nat Mon, CO
Paleogeography and Tectonic Evolution of Late Paleozoic Sedimentary Basins, Southwestern North America
Images and text modified from a poster session presented to the Annual Meeting of the Geological Society of America, Salt Lake City, Oct. 2005 by Ron Blakey, Department of Geology, NAU.
UPDATE!! Revised maps!! Additional maps!!
Additional maps not on this website as well as map revisions and updates are available at
Colorado Plateau Geosystems Website
The images and text presented here show the paleogeography and tectonic evolution of Southwestern North America during the late Paleozoic but tie into Mesozoic events as well. Emphasis is on the sedimentary basins and adjacent uplifts that comprise the Greater Ancestral Rocky Mountains (GARM). The maps document the complex, dynamic, sedimentologic and tectonic events during a diverse episode of North American geologic history. The images were prepared by placing various stratigraphic, tectonic, and sedimentologic data on a base map and then overlying more detailed landforms such as mountains, plateaus, rivers, volcanoes, and lowlands. The maps were then painted in Photoshop CS ®, mostly by cloning topography from digital elevation maps.
Outline of Presentation
Overview of Geologic Events
Maps Showing Paleogeography and Geologic History