A Guide to the Geology of Saguaro National Park

Amole Arkose Amole granite Arizona Geological Survey Avra Valley Avra Valley graben Bajada bedrock Block diagram illustrating Box Canyon caldera Cat Mountain Tuff Catalina detachment fault Catalina gneiss clay cracks Cretaceous crystals dacite deformed deposited dike Earth's surface erosion Escabrosa limestones exposed feldspar Follow Kinney Road Gates Pass geologic features graben granodiorite Hike Hills Visitor Center Hohokam Hohokam Road layers limestones LOCATION Follow Kinney LOCATION Tour road low-angle fracture lower plate rocks magma megabreccia metamorphic core complexes miles million years ago minerals molten rock Mountains metamorphic core Peak pediments Pinal Schist pluton pumice quartz Recreation Red Beds Red Hills Visitor Rincon Mountains rock debris rock varnish running water Saguaro National Park sandstone Santa Catalina Mountains sedimentary rocks southern Arizona Trail Triangular dome facets Tucson Basin Tucson Mountains Tucson Mountains caldera Turn right east uplifted upper plate rocks volcanic rocks welded tuff western North America