Welcome to the new version of CaltechAUTHORS. Login is currently restricted to library staff. If you notice any issues, please email coda@library.caltech.edu
Published 1964 | Supplemental Material + Published
Report Open

Geology and ore deposits of the Dragoon quadrangle, Cochise County, Arizona

Abstract

The area described in this report is in Cochise County in southeastern Arizona and comprises a little more than 250 square miles in the northwestern part of the county. The mining district known as Johnson Camp is near the center of the area, and the village of Dragoon on the Southern Pacific Railroad is near the southeastern corner. The area is in the Mexican Highland section of the Basin and Range province and straddles the divide between the San Pedro valley on the west and the Sulphur Spring valley on the east. The Little Dragoon Mountains in the south-central part of the area constitute the principal topographic feature. In the eastern part are the north tip of the Dragoon Mountains, the Gunnison Hills, the Steele Hills, and the south tip of the Winchester Mountains. In the west-central part are the Johnny Lyon Hills, from which a ridge extends northward and joins the Galiuro Mountains north of the area described. The rock formations of the area range in age from Precambrian to Recent. The oldest rocks are moderately metamorphosed graywackcs, slates, and lava flows that make up the Pinal schist of early Precambrian age. Also early Precambrian are rhyolite porphyry intrusive sheets and stocks, a large granodiorite mass in the Johnny Lyon Hills, and granite exposed at the south end of the Winchester Mountains. The Tungsten King granite and associated aplite on the west side of the Little Dragoon Mountains, and granite exposed at the north end of the Dragoon Mountains are also referred to the early Precambrian but could be younger. Upper Precambrian rocks, generally unmetamorphosed, include the Scanlan conglomerate, Pioneer shale, Barnes conglomerate, and Dripping Spring quartzite which are part of the Apache group; extensive diabase sills of Precambrian age were intruded into these rocks.

Additional Information

© 1964 United States Geological Survey.

Attached Files

Published - USGS_PP_416.pdf

Supplemental Material - plate-01.pdf

Supplemental Material - plate-02.pdf

Supplemental Material - plate-03.pdf

Supplemental Material - plate-04.pdf

Supplemental Material - plate-05.pdf

Supplemental Material - plate-06.pdf

Supplemental Material - plate-07.pdf

Supplemental Material - plate-08.pdf

Supplemental Material - plate-09.pdf

Supplemental Material - plate-10.pdf

Supplemental Material - plate-11.pdf

Supplemental Material - plate-12.pdf

Supplemental Material - plate-13.pdf

Files

plate-03.pdf
Files (70.8 MB)
Name Size Download all
md5:dc23c726af741482a4ab3b4c28d9cf58
976.2 kB Preview Download
md5:f2c70b9d0685a839e8cfbc4c807bdef9
3.4 MB Preview Download
md5:1452e1af607465c042d593252d3ffcb3
2.2 MB Preview Download
md5:f6bf020cf71493132b415b1ec991956a
2.3 MB Preview Download
md5:c458b48417843a8c98a533d072a855de
3.7 MB Preview Download
md5:810099bcfe8ae719210f27a0d9a0f88e
2.2 MB Preview Download
md5:c4526c2e3864e3c8f2b8d898d4f46e96
644.2 kB Preview Download
md5:37b95948be0703dd2735138cb915be7e
35.9 MB Preview Download
md5:d6abb7461a3bd3385a0bc5d6bda62273
956.4 kB Preview Download
md5:524900028b12c43e1b88844e693eac90
914.9 kB Preview Download
md5:3a660554a71dc0d690f7fe6ad53928ae
11.6 MB Preview Download
md5:39f3a94aec3500385692fe9fc335f62e
2.4 MB Preview Download
md5:8b3c121527a30e0a43b274619bea4129
2.6 MB Preview Download
md5:1ccd17e040abc9a0e8b925f58b3df795
977.9 kB Preview Download

Additional details

Created:
August 19, 2023
Modified:
January 15, 2024