Geologic Map of the Cocoraque Butte 7.5' Quadrangle, Pima County, Arizona, v. 2.0

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Author
Skotnicki, S.J.
Pearthree, P.A.
Issue Date
2020
Keywords
Arizona Geological Survey Digital Geologic Maps
Recortado Mountain
Tunnel Well
Arizona
Pima County
Sharp Peak
Coyote Mountains
Silverbell Mountains
Roskruge Mountains
Cretaceous rhyodacitic welded ash-flow tuff

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Citation
Skotnicki, S.J. and Pearthree, P.A., 2020, Geologic Map of the Cocoraque Butte 7.5' Quadrangle, Pima County, Arizona: Arizona Geological Survey Digital Geologic Map DGM-06, version 2.0, map scale 1:24,000, 29 p., 1 map sheet and metadata.
Publisher
Arizona Geological Survey (Tucson, AZ)
Description
The rocks exposed in this study area represent the eastern-most exposures of the Roskruge Mountains, themselves part of a long chain of low ridges and hills extending as far north as the Silverbell Mountains, and as far south as the Coyote Mountains. This part of the Roskruge Mountains contains rocks that can be grouped into three major subdivisions as follows: (1) a sequence of steeply tilted and folded sedimentary and volcanic rocks containing andesite, rhyolite, and both fluvial and eolian sandstones, (2) a thick pile of Cretaceous rhyodacitic welded ash-flow tuff—here containing only the Tuff of Sharp Peak, and (3) much younger middle Tertiary volcanic and sedimentary rocks. A small granitic pluton intrudes rocks of subdivision 1 but it is not entirely clear how it relates to subdivision 2 rocks. The younger Tertiary rocks are only slightly tilted, and overlie moderately to steeply tilted welded ash-flow tuffs. However, both of these sequences are everywhere separated from subdivision 1 rocks by the Recortado Well Fault. Therefore, the relative age of the steeply tilted rocks is uncertain, although exposures of similar rocks to the west (Ferguson et al., 2000) suggest that the sequence is older than subdivision 2 and 3 rocks. Furthermore, sequence 1 strata include quartz arenite of suspected eolian origin that is probably correlative with a regional suite of Jurassic wind-blown sand recognized in southern Arizona (Bilideau and Keith, 1986; Tosdal et al., 1989). Subdivision 1 rocks are overlain unconformably (and apparently conformably as well) by the Unit of Tunnel Well—a volcanogenic deposit of uncertain origin (map unit KJtw). It is not certain whether rocks exposed south of Tunnel Well below the Tertiary rocks on (map unit Kt) are also the Unit of Tunnel or are younger
URI
http://hdl.handle.net/10150/630861
Additional Links
https://library.azgs.arizona.edu/item/ADGM-1599593370320-888
Language
en
Series/Report no.
DGM-06
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
32.25
South Bounding Coordinate
32.125
West Bounding Coordinate
-111.375
East Bounding Coordinate
-111.25
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