Surficial geologic maps of the Picacho Basin
Issue Date
1990Keywords
Arizona Geological Survey Open File ReportsPicacho Basin
Pinal County
Arizona
surficial geology
map
topography
geomorphology
Geology
RecentLate TertiaryQuaternaryPleistoceneHolocenePicacho Peak State ParkPicacho PeakBasin and Range ProvinceSanta Cruz RiverMcClellan WashCasa Grande MountainsSacaton MountainSilver Bell MountainsPicacho Mountainsbasin-fillevaporitehalf-grabenproblem soilsearth fissuresdebris flowsarroyogeologic hazardsoverbank depositsfloodplainFloodingbraided channeleolian landformsalkaline soilsduripanriver terracesoilsdesert pavementalluviumalluvial fanpiedmont
Metadata
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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 1:24,000Additional Links
http://repository.azgs.az.gov/uri_gin/azgs/dlio/321Language
enSeries/Report no.
OFR-90-02Rights
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
32.9538South Bounding Coordinate
32.5009West Bounding Coordinate
-111.709East Bounding Coordinate
-111.165Collections
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