Geologic Map of the Mescal 7.5' Quadrangle, Pima and Cochise Counties, Arizona, v. 1.0
KeywordsArizona Geological Survey Digital Geologic Maps
Little Rincon Mountains
San Pedro Basin
mature clastic sedimentary rocks
Shallowwater platform carbonate
MetadataShow full item record
CitationSkotnicki, S.J., 2001, Geologic Map of the Mescal 7.5' Quadrangle, Pima and Cochise Counties, Arizona: Arizona Geological Survey Digital Geologic Map DGM-09, version 1.0, map scale 1:24,000, 26 p., 1 map sheet and metadata.
PublisherArizona Geological Survey (Tucson, AZ)
DescriptionThe Mescal quadrangle straddles the divide between the Tucson basin to the west and the San Pedro Basin to the east. The region is dominated by Late Tertiary basin-fill deposits that form the low divide between the Whetstone Mountains to the south and the Rincon and Little Rincon Mountains to the north. Interstate 10 crosses this low area just south of the drainage divide. The Mescal 7.5´ quadrangle was mapped as part of the STATEMAP program. Fieldwork was carried out between November, 2000 and April, 2001 and was concurrent with mapping to the north in the Galleta Flat 7.5´ quadrangle. The low, subdued nature of the area hides a complex geologic history. Shallowwater platform carbonate and mature clastic sedimentary rocks were deposited during the Paleozoic on an extensive erosion surface beveled across Proterozoic granitic and metamorphic rocks. Erosion and faulting during the Late Jurassic led to infilling of the Bisbee Basin by the upper Jurassic to middle Cretaceous Bisbee Group. The resulting succession of Paleozoic and Mesozoic strata in the Whetstone Mountains is one of the thickest sequences preserved anywhere in the state. These rocks were deformed during compression and thrust faulting during the Laramide orogeny at the end of the Cretaceous. Laramide structures are now obscure because of overprinting by younger deformation, plutonism, and extensional. The region owes its present geography to younger (Miocene) block-faulting that occurred during Basin-and-Range extension. Late Tertiary (Late Miocene to Pliocene) sediments partially filled the low areas, and these deposits have been modified by repeated cycles of dissection and deposition during the Quaternary.
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Collection InformationDocuments 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 email@example.com.
North Bounding Coordinate33
South Bounding Coordinate31.875
West Bounding Coordinate-110.5
East Bounding Coordinate-110.375
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