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    Surficial geologic maps of the Picacho Basin

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    Author
    Jackson, G.
    Issue Date
    1990
    Keywords
    Arizona Geological Survey Open File Reports
    Picacho Basin
    Pinal County
    Arizona
    surficial geology
    map
    topography
    geomorphology
    Geology
    Recent
    Late Tertiary
    Quaternary
    Pleistocene
    Holocene
    Picacho Peak State Park
    Picacho Peak
    Basin and Range Province
    Santa Cruz River
    McClellan Wash
    Casa Grande Mountains
    Sacaton Mountain
    Silver Bell Mountains
    Picacho Mountains
    basin-fill
    evaporite
    half-graben
    problem soils
    earth fissures
    debris flows
    arroyo
    geologic hazards
    overbank deposits
    floodplain
    Flooding
    braided channel
    eolian landforms
    alkaline soils
    duripan
    river terrace
    soils
    desert pavement
    alluvium
    alluvial fan
    piedmont
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    Citation
    Jackson, G., 1990, Surficial geologic maps of the Picacho Basin. Arizona Geological Survey Open File Report, OFR-90-02, 5 map sheets, map scale 1:24,000, 9 p.
    Publisher
    Arizona Geological Survey (Tucson, AZ)
    Description
    Surficial geologic maps of the Picacho Basin. The Picacho basin is a large and complex graben surrounded by horsts and half-horsts, which are now the Picacho, Casa Grande, Silverbell, and Sacaton mountains. It formed mainly in response to late Miocene extension. Internal drainage probably persisted until about 3 million years ago. Several thousand meters of sediments fill the basin; 2000 m of evaporites and claystone form the bulk of the basin fill (Scarborough and Pierce, 1978). The upper 200 meters or so of basin fill was deposited by a gradually aggrading, regionally integrated drainage system. Young alluvium of the Santa Cruz River is up to 30 m thick and is found within 3.2 km of the modern channel (Pool, 1986). Although the Picacho Basin does have external drainage, extremely low stream gradients and a lack of long-term downcutting have resulted in playa-like sediments, eolian deposits, and a lack of significant elevation differences between "terraces. Unlike basins upstream, the Picacho basin has not been incised significantly during the Quaternary. One report and 5 map sheets, 1:24,000 map scale. Scale 1:24,000
    URI
    http://hdl.handle.net/10150/630807
    Additional Links
    https://library.azgs.arizona.edu/
    Language
    en
    Series/Report no.
    OFR-90-02
    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
    32.9538
    South Bounding Coordinate
    32.5009
    West Bounding Coordinate
    -111.709
    East Bounding Coordinate
    -111.165
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    AZGS Document Repository

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