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    Geology of the Tonto Basin 7.5' Quadrangle, Gila and Maricopa Counties, Arizona v.2

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    Author
    Ferguson, C.A.
    Skotnicki, S.J.
    Gilbert, W.G.
    Issue Date
    2024
    Keywords
    alluvial fan
    alluvial terraces
    extension
    geology
    geomorphology
    half-graben
    Payson Fault
    Tertiary conglomerates
    mid-tertiary
    Proterozoic
    quaternary
    arizona
    Gila County
    Maricopa County
    Payson Basin
    Sierra Ancha
    Tonto Basin
    transition zone
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    Citation
    Ferguson, C.A., Skotnicki, S.J., and Gilbert, W.G., 2024, Geology of the Tonto Basin 7.5' Quadrangle, Gila and Maricopa Counties, Arizona v.2. Arizona Geological Survey Digital Geologic Map, DGM-216, 2 map sheets, map scale 1:24,000, 15 p.
    Publisher
    Arizona Geological Survey (Tucson, AZ)
    Description
    Tonto Basin is a Mid-Tertiary, west-tilted half-graben located in the Transition Zone tectonic province of central Arizona (Figure 1). Along with the northerly adjacent Payson Basin, Tonto Basin is bounded on the west by a major east-side-down normal fault that accomodates at least 3,000' of displacement. In the Payson basin, the basin-bounding fault was named Payson fault (Muehlberger, 1990) and it forms the abrupt, east-facing escarpment of the Mazatzal Mountains. The western basin-bounding fault of Tonto Basin is also referred to as Payson fault, even though there is an abrupt change of strike where the two basins merge (Figure 1). The eastern margin of both basins is defined by a gentle, west-dipping, depositional unconformity with Proterozoic rocks of the Sierra Ancha (Martin, 1990; Mayes, 1990). Tonto Basin is filled with Miocene and younger mudstone and conglomerate that in general dip gently to the west. Locally along the western margin of the Tonto Basin and in the center of Payson Basin (Muehlberger, 1988), an older sequence of east-tilted conglomerates are present suggesting a complex structural history along the Payson fault. A sequence of Pliocene and younger conglomerate and mudstone in the Payson basin overlap the Payson fault (Muehlberger, 1988), and are probably equivalent with a sequence of flatlying, post-tectonic, younger Tertiary conglomerates in the Tonto Basin which also bury the Payson fault. Report and geology of the Tonto Basin 7.5' Quadrangle, Gila and Maricopa Counties, Arizona. scale 1:24,000.
    URI
    http://hdl.handle.net/10150/675630
    Additional Links
    https://library.azgs.arizona.edu/
    Language
    en
    Series/Report no.
    DGM-216
    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
    34.4522
    South Bounding Coordinate
    33.3764
    West Bounding Coordinate
    -112.039
    East Bounding Coordinate
    -109.841
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