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Mayo, E.B. Simplified geology map of the area surrounding Tucson (from the Arizona Geological Survey). The Tucson Mountains are composed of volcanic rocks that collapsed into a caldera about 70 million years ago. Eventbrite - Pima County Natural Resources, Parks & Recreation presents Geology of the Tucson Mountains - Saturday, March 6, 2021 - Find event and registration information. This is a non-technical treatment of the geology and ecology of the Santa Catalina Mountains, Tucson, Arizona. Figure 19. (discussed above) Also shown on geologic map, Figure 30.A basal unit of the volcanic blowout is called the 'chaos' unit, which is a huge thick pile of older rock debris and rhyolite blowout ' breccia ' (broken-up rock) which is seen on the Tucson city (east) side. (1963) Volcanic orogeny of the Tucson Mountains (a preliminary report): Arizona Geological Society Digest: 6: 61-82. 231-087, Walter E. Heinrichs, Jr. mining collection, Arizona Geological Survey. Natural landscapes have distinctive personalities. thesis, 42 p. Bickerman (1962). Greenstein, G. (1961) The structure of the Amole Arkose north of King Canyon, Tucson Mountains, Arizona: Tucson, University of Arizona, M.S. Join geologist George online via Zoom to learn about the Tucson Mountains. The Tucson Mountains are a small (about 40,000 hectares) desert range in the Arizona Upland subdivision of the Sonoran Desert in Pima County, southern Arizona. The Tucson Mountains, on the west side of the basin, were once located some 30 km to the east above the batholitic rocks. Tucson Mountains is covered by the Cat Mountain, AZ US Topo Map quadrant Figure 19 maps the chaos unit distribution. The USGS (U.S. Geological Survey) publishes a set of the most commonly used topographic maps of the U.S. called US Topo that are separated into rectangular quadrants that are printed at 22.75"x29" or larger. Please cite by using: [a description of the item]. Kinnison, John E. 1958 Geology and ore deposits of the southern section of the Amole mining district, Tucson Mountains, Pima County, Arizona M.S. Sketch Map of the Tucson Mountains supervolcano. Each is the product of the interplay of geology, climate, vegetation, time, and often, human activities. The steeper mountain slopes generally are within Tucson Mountain Park (Pima County) or the western unit of Saguaro National Park, but development is occurring immediately adjacent to these parks. The red colors are granitic batholith rocks (although sheared). The caldera was about 12 miles wide and 15 miles long. Kirk, Jason 2000 A detrital model for the origin of gold and sulfides in the Witwatersrand basin based on Re-Os isotopes M.S. Publication type: Report: Publication Subtype: USGS Numbered Series: Title: Geologic map of the Tucson Mountains Caldera, southern Arizona: Series title: IMAP These ranges are the result of block faulting, which occurred about 10-15 million years ago (MYA), and today are separated by basins 123p. The Tucson Basin is an alluvial filled down-drop basin and range graben. 21p. Geology of the Tucson Mountains General Setting of the Tucson Mountains The Tucson Mountains are one of many relatively small ranges that dot the south-western United States belonging to the Basin and Range Province. The volcano collapsed as the result of rapid eruption of volcanic ash which piled up in flows that reached an accumulated thickness of about three miles. The dominant vegetation types are desertscrub and desert grassland.The vascular flora is unusually rich with 630 specific and infraspecific taxa in 332 genera and 80 families. Human activities [ a description of the item ], Walter E. Heinrichs Jr.... 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