Bedrock Geologic Map of Sentinel Peak (A-Mountain) and Tumamoc Hill, Pima County, Arizona, v. 1.0
KeywordsArizona Geological Survey Digital Geologic Maps
digital geologic map
MetadataShow full item record
CitationSpencer, J.E., Moore, E.M., and Trapp, R.A., 2003, Bedrock Geologic Map of Sentinel Peak (A-Mountain) and Tumamoc Hill, Pima County, Arizona: Arizona Geological Survey Digital Geologic Map DGM-29, version 1.0, map scale 1:24,000.
PublisherArizona Geological Survey (Tucson, AZ)
DescriptionTumamoc Hill and Sentinel Peak form a group of hills at the western edge of Tucson in southeastern Arizona, and comprise a small part of the Tucson Mountains. Sentinel Peak, also known as A-Mountain, is a prominent landmark near downtown Tucson. The geology of Tumamoc Hill and Sentinel Peak is dominated by 20 to 30 million year old (Ma) volcanic rocks, unlike most of the rest of the Tucson Mountains which are composed primarily of much older volcanic rocks that were largely produced during a single enormous eruption (Lipman, 1993; Kring, 2002). This map is simplified from the map of Phillips (1976, University of Arizona M.S. thesis). It was created so that the geology of the Tumamoc Hill – Sentinel Peak area can be readily discerned from an available color map, and includes a description of map units and their approximate ages. Potassium-argon (K-Ar) radiometric dates are given with 1σ analytical uncertainty, and most dates are recalculated by Reynolds et al. (1986) using newer decay and abundance constants.
RightsArizona Geological Survey. All rights reserved.
Collection InformationDocuments in the AZGS Document Repository collection are made available by the Arizona Geological Survey (AZGS) and the University Libraries at the University of Arizona. For more information about items in this collection, please contact firstname.lastname@example.org.
North Bounding Coordinate32.2
South Bounding Coordinate32.094
West Bounding Coordinate-111.04
East Bounding Coordinate-110.982
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