Two Bar Ridge

Kiven, C.W., and Ivey, J.B., 1981, Geology of the Pinal and Pinto Creek drainage basins, Gila, Pinal, and Maricopa Counties, Arizona: Florence, Ariz., Central Arizona Association of Governments, Mineral Extraction Task Force Report METF-4, 64 p.

Conley, J.N., Koester, E.A., and Rauzi, S.L., 1995, Well location map, Maricopa County, Arizona - wells posted to January 1995: Arizona Geological Survey Oil and Gas Publication OG-3, 2 sheets, scale 1:500,000.

Pearthree, P.A., and Huckleberry, Gary, 1994, Surficial geologic map of the Mesa 30' x 60' quadrangle, Arizona: Arizona Geological Survey Open-File Report 94-24, 1 sheet, scale 1:100,000.

Skotnicki, Steve, 1993, Index to geologic maps in the Mesa 1o x 2o quadrangle, Arizona: Arizona Geological Survey Open-File Report 93-19, 18 p., 3 sheets, scale 1:250,000.

Keyes, Charles, 1934, Medley of Apache Group in Arizona: Pan-American Geologist, v. 61, no. 4, p. 302-306.

Hammond, J.G., 1990, Middle Proterozoic diabase intrusions in the southwestern U.S.A. as indicators of limited extensional tectonism, in Gower, C.F., Rivers, T., and Ryan, B., eds., Mid-Proterozoic Laurentia-Baltica: Geological Association of Canada Special Paper 38, p. 517-534.

Horodyski, R.J., 1993, Precambrian paleontology of the western conterminous United States and northwestern Mexico, in Link, P.K., ed., Middle and Late Proterozoic stratified rocks of the western U.S. cordillera, Colorado Plateau, and Basin and Range Province, Chap. 6, in Reed, J.C., Jr., and others, eds., Precambrian: Conterminous U.S.: Geological Society of America, The Geology of North America, v. C-2, p. 558-565, refs. p. 575-595.

Wrucke, C.T., 1993, The Apache Group, Troy Quartzite, and diabase: Middle Proterozoic rocks of central and southern Arizona, in Link, P.K., ed., Middle and Late Proterozoic stratified rocks of the western U.S. Cordillera, Colorado Plateau, and Basin and Range Province, in Reed, J.C., Jr., and others, eds., Precambrian: Conterminous U.S.: Geological Society of America, The Geology of North America, v. C-2, p. 517-521, refs. p. 575-595.

Schwartz, R.J., and Magleby, D.N., 1955, Final report, airborne reconnaissance project, Dripping Spring Quartzite, Gila County, Arizona: U.S. Atomic Energy Commission Report RME-2081, 19 p., 1 sheet, scale 1:700,000 (approx.).

Faulds, J.E., 1989, Geologic map of the Salt River region, Rockinstraw Mountain quadrangle, Gila County, Arizona [Dagger Peak, and Meddler Wash 7.5 min]: Arizona Geological Survey Contributed Map CM-89-B, 3 sheets, scales 1:24,000 and 1:375,000.