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Proterozoic Geologic Period

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• The Homestake Gold Mine, an Early Proterozoic iron-formation-hosted gold deposit, Lawrence County, South Dakota ([Washington, D.C.] : United States Government Printing Office, 1991., 1991), by Stanton W. Caddey and Geological Survey (U.S.) (page images at HathiTrust)
• New observations on the age and structure of Proterozoic quartzites in Wisconsin (Washington, D.C. : United States Government Printing Office, 1991., 1991), by Gene L. LaBerge, Paul E. Myers, J. S. Klasner, and Geological Survey (U.S.) (page images at HathiTrust)
• Tectonic imbrication and foredeep development in the Penokean orogen, east-central Minnesota : an interpretation based on regional geophysics and the results of test-drilling ([Washington, D.C.] : United States Government Printing Office, 1991., 1991), by D. L. Southwick, Timothy B. Holst, G. B. Morey, and Geological Survey (U.S.) (page images at HathiTrust)
• Neodymium isotopic evidence for Early Proterozoic units in the Watersmeet Gneiss Dome, northern Michigan (U.S. G.P.O., 1991), by Karin M. Barovich, Zell E. Peterman, P. K. Sims, Warren C. Day, John Patchett, and Geological Survey (U.S.) (page images at HathiTrust)
• Evidence for continental crustal assimilation in the hemlock formation flood basalts of the Early Proterozoic Penokean orogen, Lake Superior region (U.S. G.P.O., 1991), by J. Warren Beck, V. Rama Murthy, and Geological Survey (U.S.) (page images at HathiTrust)
• Nature and style of deformation in the foreland of the early Proterozoic Penokean orogen, northern Michigan (U.S. G.P.O., 1991), by J. S. Klasner, G. L. LaBerge, K. J. Schulz, R. W. Ojakangas, and Geological Survey (U.S.) (page images at HathiTrust)
• Implications for correlating quartzites of the Baraboo interval (U.S. G.P.O., 1993), by Val W. Chandler, G. B. Morey, and Geological Survey (U.S.) (page images at HathiTrust)
• Regional stratigraphic implications and suggested correlations (U.S. G.P.O., 1994), by Richard W. Ojakangas and Geological Survey (U.S.) (page images at HathiTrust)
• Clastic rocks associated with the Midcontinent Rift System in Iowa (U.S. G.P.O. ;, 1997), by Raymond R. Anderson, Robert M. McKay, and Geological Survey (U.S.) (page images at HathiTrust)
• The Lawson Creek Formation of Middle Proterozoic age in east-central Idaho (United States Government Printing Office :, 1980), by S. W. Hobbs (page images at HathiTrust)
• Base- and precious-metal concentrations of early Proterozoic massive sulfide deposits in Arizona : crustal and thermochemical controls of ore depositon (United States Government Printing Office, 1995), by Ed DeWitt (page images at HathiTrust)
• Middle Proterozoic Belt Supergroup, Highland Mountains, southwestern Montana (United States Government Printing Office :, 1995), by J. Michael O'Neill (page images at HathiTrust)
• Revision of Middle Proterozic Yellowjacket Formation, central Idaho, and Revision of Cretaceous Slim Sam Formation, Elkhorn Mountains area, Montana (U.S. G.P.O. ;, 2000), by Russell G. Tysdal (page images at HathiTrust)

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