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125 Years of Science for America - 1879 to 2004
U.S. Geological Survey
Geologic Investigations Series I-2780

Geologic Map of the San Carlos Indian Reservation, Arizona

By Chester T. Wrucke, Calvin S. Bromfield, Frank S. Simons, Robert C. Greene, Brenda B. Houser, Robert J. Miller, and Floyd Gray


Prepared in cooperation with the
San Carlos Apache Tribe and U.S. Bureau of Indian Affairs

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This map is a result of a study of the geology and mineral resource potential of the San Carlos Indian Reservation (Reservation) for the San Carlos Apache Tribe. The map provides new information on the geology of an area that contains the boundary between the Basin and Range Province on the south and the mountainous terrain that, in this part of Arizona, borders the southern structural margin of the Colorado Plateaus Province (herein referred to as the Colorado Plateau) on the north. In particular the map shows the great variety of Tertiary volcanic and sedimentary rocks typical of the northern part of the Basin and Range Province in east-central Arizona and the structural complications resulting from Cenozoic extension. Geology depicted in this map may aid in the interpretation of mineral resources between the copper mining areas of the Globe-Miami district to the west of the Reservation and the Morenci district to the east.



File Name
File Type and Description
File Size
PDF file of the 29-page descriptive geologic pamphlet that accompanies the map
456 KB
PDF file of 49" x 39" map sheet 1 (geologic map) that can be used for viewing map in a browser, as well as for plotting
16.3 MB
PDF file of 35" x 37" map sheet 2 (Correlation of Map Units, Description of Map Units, table of isotopic ages, table of chemical analyses)
240 KB
Text-only readme file that explains the contents of the data files (coming soon)
64 KB
Data files
19.3-MB compressed; 42.8 MB expanded

For questions about the content of this report, contact Chet Wrucke

Version history

This report is also available in print:

U.S. Geological Survey, Information Services
Box 25286, Federal Center
Denver, CO 80225
Telephone: 1–888–ASK–USGS (1–888–275–8747)

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Maintained by: Michael Diggles
Created: November 5, 2004
Last modified: December 2, 2005 (mfd)