Geologic Map of the Samaniego Hills, Pinal and Pima Counties, Southern Arizona v. 2.0

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Author
Ferguson, C.A.
Gilbert, W.G.
Orr, T.R.
Spencer, J.E.
Richard, S.M.
Pearthree, P.A.
Peters, L.
Issue Date
2022
Keywords
Arizona Geological Survey Open File Reports
late Pleistocene
Late Holocene
Late Cretaceous
Miocene
Oligocene
Middle Proterozoic
Cerro Prieto
Sasco
Silver Bell Caldera complex

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Citation
Ferguson, C.A., Gilbert, W.G., Orr, T.R., Spencer, J.E., Richard, S.M., Pearthree, P.A., and Peters, L., 1999, Geologic Map of the Samaniego Hills, Pinal and Pima Counties, Southern Arizona. Arizona Geological Survey Open File Report, OFR-99-17, 1 map sheet, map scale 1:24,000, 17 p.
Publisher
Arizona Geological Survey (Tucson, AZ)
Description
The Samaniego Hills are a low series of hills composed of flat-lying to gentlydipping early Miocene and possibly late Oligocene lava flows interbedded with thin units of volcaniclastic and locally non-volcaniclastic sandstone and conglomerate. The preserved sequence is approximately 600 meters thick. The top is not preserved, but the base is well exposed along the southern edge of the hills, where it overlaps K-feldspar porphyritic granite of probable Middle Proterozoic age invaded by diabase dikes. The diabase occurs as vertical and subhorizontal dikes, and is probably associated with the Middle Proterozoic Apache Group, which overlies the granite sparingly along the southern edge of the map area. The granitic rocks form a broad piedmont surface that grades upslope to the southwest into the Silver Bell Mountains, which are dominated by Late Cretaceous volcanic, sedimentary, and hypabyssal plutonic rocks associated with the Silver Bell Caldera complex (Watson, 1964; Sawyer, 1996).
URI
http://hdl.handle.net/10150/630611
Additional Links
https://library.azgs.arizona.edu/item/ADGM-1669151162301-513
Language
en
Series/Report no.
DGM-179
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
32.6236
South Bounding Coordinate
32.44
West Bounding Coordinate
-111.5
East Bounding Coordinate
-111.375
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