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    Geologic Map of Surficial and Basin Deposits of the Upper Santa Cruz Valley, Southeastern Arizona

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    Author
    Pearthree, Philip A.
    Affiliation
    Arizona Geological Survey
    Issue Date
    2025
    Keywords
    Santa Cruz Valley
    Santa Cruz river
    Sonoita Creek
    Potrero Creek
    Sopori Wash
    piedmont
    Holocene
    late Pleistocene
    Quaternary
    Santa Rita Mountains
    mines
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    Citation
    Pearthree, P.A., 2025, Geologic Map of Surficial and Basin Deposits of the Upper Santa Cruz Valley, Southeastern Arizona, DGM-294
    Publisher
    Arizona Geological Survey (Tucson, AZ)
    Description
    This surficial geologic map covers the upper Santa Cruz Valley between the southern edge of the Tucson 30’ x 60’ quadrangle mapped previously (Pearthree et al., 2024) and the international border with Mexico. The map depicts the distribution of surficial and basin deposits in some detail, whereas all bedrock within the map area is grouped in one unit. The map area is entirely within the watershed of the north-flowing Santa Cruz River and its principal tributaries of Sonoita Creek, Potrero Creek, and Sopori Wash. Incision by axial streams and related basin dissection vary dramatically across the map area. In the south, the Santa Cruz River and tributaries have eroded deeply into basin deposits during the Quaternary. The swath of axial valley alluvium is relatively narrow; adjacent piedmonts on either side of the valley are covered with tributary deposits ranging in age from Holocene to early Pleistocene, and eroded basin deposits are extensively exposed. The Santa Cruz River and its tributaries are only modestly incised in the northern part of the map area. Holocene and late Pleistocene tributary deposits are very extensive, covering most piedmont areas, with older Pleistocene remnants confined to upper piedmont areas. Many normal faults that cut Quaternary or Neogene deposits are depicted on the map. Most of the faults are part of the Santa Rita fault zone, which stretches from near the northern margin of the map to Josephine Canyon, on the piedmont between the Santa Cruz River and the Santa Rita Mountains. This fault zone was most recently active in the late Pleistocene, and there is evidence for recurrent fault movement in the Quaternary (Pearthree and Calvo, 1987). No definitive evidence of Quaternary activity has been discovered along the other faults depicted on the map, but they do displace Neogene basin deposit (units QNs and Ns). Several large mines focused primarily on copper have been developed on the west side of the Santa Cruz River. In addition, there are several aggregate mines situated in Santa Cruz River deposits. Mines, tailings, and related surface disturbance, landfills, water recharge facilities, and most of the Interstate Highway 19 corridor are mapped as “disturbed”. This geologic map was funded in part by the U.S. Geological Survey National Cooperative Geological Mapping Program under STATEMAP award G23AC00556. The views and conclusion obtained in this document are those of the authors and should not be interpreted as necessarily representing the official policies, either expressed or implied, of the U.S. Government.
    URI
    http://hdl.handle.net/10150/679106
    Additional Links
    https://library.azgs.arizona.edu/
    Language
    en
    Series/Report no.
    DGM-294
    Rights
    Arizona Geological Survey. All rights reserved.
    Collection Information
    Documents in the AZGS Documents 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
    32.000017
    South Bounding Coordinate
    31.332387
    West Bounding Coordinate
    -111.377086
    East Bounding Coordinate
    -110.625624
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