From Arizona Geological Survey E-Magazine
The U.S. National Park Service just released a comprehensive ‘Geologic Resources Inventory Report’ for Organ Pipe Cactus National Monument, Arizona. USA. The 104-page report by Katie KellerLynn (Colorado State University) includes 32 figures and 3 tables, and links to GIS database(s) of geologic mapping of the monument.
Organ Pipe Cactus National Monument (~ 517 sq. miles) is located in the Basin and Range Province of southwestern Arizona, adjacent to the U.S.-Mexico frontier. In 1937, President Franklin D. Roosevelt issued a Presidential Proclamation establishing the monument in order to preserve a pristine section of the Sonoran Desert Habitat. Ninety-Five percent of the monument is set aside as ‘wilderness’ area. The rugged monument landscape accommodates six mountain ranges: Bates Mountains, Cipriano Hills, Quitobaquito Hills, Puerto Blanco Mountains, Diablo Mountains, and Ajo Range, and parts of four others, Growler Mountains, Sonoyta Mountains, Sierra de Santa Rosa, and Gunsight Hills. (Read more) (Download full report)
A Guide to the Geology of Organ Pipe Cactus National Monument and the Pinacate Biosphere Reserve