January 23, 2020

Geology of the Santa Rita Mountains

The top of Mt. Wrightson and most of the country to the east is the "Mt. Wrightson Formation", which are volcanics (and some sediments) of 170 to 185 Ma age (Jurassic). Most of Madera Canyon itself is in much younger (Cretaceous) granitic intrusions (60-70 Ma). The Santa Rita Mountain are southeast of Tucson Arizona. 
Drewes, Harald, 1971, Mesozoic stratigraphy of the Santa Rita Mountains, southeast of Tucson, Arizona:
U.S. Geological Survey Professional Paper 658-C, 81 p.
Drewes, 1972a, Cenozoic rocks of the Santa Rita Mountains, southeast of Tucson, Arizona:
U.S. Geological Survey Professional Paper 746, 66 p.
Drewes, 1972b, Structural geology of the Santa Rita Mountains, southeast of Tucson, Arizona:
U.S. Geological Survey Professional Paper 748, 35 p., scales 1:12,000 and 1:100,000, 4 sheets.
Drewes, 1976, Mesozoic stratigraphy of the Santa Rita Mountains, southeast of Tucson, Arizona:
U.S. Geological Survey Professional Paper 658-C, 81 p.
Drewes, 1981, Tectonics of southeastern Arizona:  U.S. Geological Survey Professional paper, v. 1144, p. 1-96.
Drewes, 1996, Geology of the Coronado National Forest, in du Bray, E.A., ed.,
Mineral resource potential and geology of Coronado National Forest, southeastern Arizona and southwestern New Mexico:
U.S. Geological Survey Bulletin 2083-B, p. 17-41, various scales, plates 1-4,

Drewes, Harald, Fields, R.A., Hirschberg, D.M., and Bolm, K.S., 2002,
Spatial digital database for the tectonic map of southeast Arizona:
U.S. Geological Survey Miscellaneous Investigations Series Map I-1109,
Digital database, ver. 2.0, published scale 1:125.000, 2 sheets accessed September 9, 2012 at
http://pubs.usgs.gov/imap/i1109/i1109_e.pdf [sheet 1 of 2] and
http://pubs.usgs.gov/imap/i1109/i1109_w.pdf [sheet 2 of 2]
In the following, you want sheet 2
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Tom's Geology Info / [email protected]