Visitors can access information on the geology of the Mojave National Preserve in California. Features include a field trip describing areas of interest at the preserve, as well as a geologic time scale describing the history and development of the area. There are discussions of the formation and history of the present day playa lakes, the underlying Paleozoic limestone and dolomite, and the formation of Mitchell Caverns. Other topics include eolian activity and resulting features in the Kelso Dunes National Natural Landmark and the Devil’s Playground, and the role of granitic and metamorphic rock in the formation of pediments. There is also a geologic map of the area and links to maps and technical papers.