Geologic map of the Oracle Junction 7.5' Quadrangle and the eastern third of the Tortolita Mountains 7.5' Quadrangle, Pima and Pinal Counties, Arizona v. 2.0

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Author
Skotnicki, S.J.
Issue Date
2022
Keywords
Arizona Geological Survey Open File Reports
Paleozoic
upper Jurassic
cretaceous
Quaternary
Pleistocene
Late Tertiary
American Flag Formation
Cambrian Abrigo Formation
Carpas Wash

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Citation
Skotnicki, S.J., 2000, Geologic map of the Oracle Junction 7.5' Quadrangle and the eastern third of the Tortolita Mountains 7.5' Quadrangle, Pima and Pinal Counties, Arizona. Arizona Geological Survey Open File Report, OFR-00-04, 1 map sheet, map scale 1:24,000, 19 p.
Publisher
Arizona Geological Survey (Tucson, AZ)
Description
This study encompasses the whole of the Oracle Junction 7.5' quadrangle and the eastern third of the Tortolita Mountains 7.5' quadrangle (see figure 1). Late Tertiary basin-fill deposits and younger Quaternary surficial deposits dominate most of the region and are well-exposed along the length of Oro Valley. The western third or so is underlain by a broad, flat pediment on the east side of the Tortolita Mountains. The pediment was etched into Proterozoic and Tertiary granitic rocks and is punctuated by more resistant hills of Pinal Schist and an east-northeast-trending band of younger metasedimentary rocks. Middle and Late Pleistocene sandstones and conglomerates lap up onto the pediment. These deposits contain material eroded from the granitic rocks and show very little topographic relief relative to the pediment. As a result, in aerial photographs, and locally even from a short distance away (tens to hundreds of meters), these deposits are nearly indistinguishable from the bedrock pediment.
URI
http://hdl.handle.net/10150/630615
Additional Links
https://library.azgs.arizona.edu/item/ADGM-1669146135392-574
Language
en
Series/Report no.
DGM-156
Rights
Arizona Geological Survey. All rights reserved.
Collection Information
Documents 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 azgs-info@email.arizona.edu.
North Bounding Coordinate
32.621
South Bounding Coordinate
32.5
West Bounding Coordinate
-111.038
East Bounding Coordinate
-110.871
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