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GENERAL GEOLOGY OF THE TUCSON BASIN
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Amole Arkose Amole granite Arizona Geological Survey Avra Valley Bajada bedrock Block diagram illustrating Box Canyon caldera called Cat Mountain Tuff Catalina detachment fault Catalina gneiss clay cracks Cretaceous crustal rocks crystals dacite deformed deposited dike Earth’s crust Earth’s surface erosion Escabrosa limestones exposed feldspar ﬁll ﬂoor Follow Kinney Road Gates Pass Geologic features graben granodiorite Hike Hills Visitor Center Hohokam illustrating the formation layers limestone LOCATION Follow Kinney LOCATION Tour road lower plate rocks magma manganese megabreccia metamorphic core complexes metamorphic rock miles million years ago minerals molten rock Mountains metamorphic core pediments Pinal Schist pluton pumice quartz Recreation Red Beds Red Hills Visitor Rincon Mountains Rincon Mountains District Road.Turn right east rock debris rock varnish running water Saguaro National Park sandstone Santa Catalina Mountains sedimentary rocks southern Arizona Tertiary Trail Tucson Basin Tucson Mountains Tucson Mountains caldera uplifted upper plate rocks volcanic rocks western North America