Geological Survey Professional Paper 754—C The Portage Lake Volcanics (Middle Keweenawan) on Isle Royale, Michigan

American Commission on Stratigraphic Nomenclature, 1970, Code of stratigraphic nomenclature: Tulsa, Okla., Am. Assoc. Petroleum Geologists, 19 p.

Bayley, R. W., and Muehlberger, W. R., compilers, 1968, Basement rock map of the United States, exclusive of Alaska and Hawaii: U.S. Geol. Survey, 2 sheets, scale 1:2,500,000.

Books, K. G., 1968, Magnetization of the lowermost Keweenawan lava flows in the Lake Superior area, in Geological Survey research 1968: U.S. Geol. Survey Prof. Paper 600—D, p. D248-D254.

______ 1972, Paleomagnetism of some Lake Superior Keweenawan rocks: U.S. Geol. Survey Prof. Paper 760, 42 p.

Broderick, T. M., 1935, Differentiation in lavas of the Michigan Keweenawan: Geol. Soc. America Bull., v. 46, p. 503-558.

Broderick, T. M., Hohl, C, D., and Eidemiller, H. N., 1946, Recent contributions to the geology of the Michigan copper district: Econ. Geology, v. 41, no. 7, p. 675-725.

Bulter, B. S., and Burbank, W. S., 1929, The copper deposits of Michigan: U.S. Geol. Survey Prof. Paper 144, 238 p.

Cornwall, H. R., 1951a, Differentiation in lavas of the Keweenawan Series and the origin of the copper deposits of Michigan: Geol. Soc. America Bull., v. 62, p. 159-202.

______1951b, Differentiation in magmas of the Keweenawan Series: Jour. Geology, v. 59, no, 2, p. 151-172.

______ 1954a, Bedrock geology of the Phoenix quadrangle, Michigan: U.S. Geol. Survey Geol. Quad. Map GQ—34, scale 1:24,000.

1954b, Bedrock geology of the Delaware quadrangle, Michigan: U.S. Geol. Survey Geol. Quad, Map GQ—51, scale 1:24,000.

1954c, Bedrock geology of the Lake Medora quadrangle, Michigan: U.S. Geol. Survey Geol. Quad. Map GQ-52, scale 1:24,000.

Cornwall, H. R., and Wright, J. C., 1956, Geologic map of the Laurium quadrangle, Michigan: U.S. Geol. Survey Mineral Inv. Field Studies Map MF—47, scale 1:24,000.

Davidson, E. S., Espenshade, G. H., White, W. S., and Wright, J. C., 1955, Bedrock geology of the Mohawk quadrangle, Michigan: U.S. Geol. Survey Geol. Quad. Map GQ—54, scale 1:24,000.

Foster, J. W., and Whitney, J. D., 1850, Report on the geology and topography of a portion of the Lake Superior Land District in the State of Michigan; Part 1, Copper Lands: U.S. 31st Cong., 1st sess, House Ex. Doc. 69, 224 p.

Green, J. C., 1971, The North Shore Volcanic Group, in Inst. Lake Superior Geology, 17th Ann,, 1971, Abs. and Field Guides: Duluth, Minn., p. 74-96.

Green, J. C., and Books, K. G., 1972, Paleomagnetic evidence for the extent of lower Keweenawan lavas in Minnesota [abs.], in Inst. Lake Superior Geology, 18th Ann., 1972, Abs. and Field Guides, Paper 8: Houghton, Mich.

Halls, H. C., 1966, A review of the Keweenawan geology of the Lake Superior region, in The earth beneath the continents—a volume of geophysical studies in honor of Merle A. Tuve: Am. Geophys. Union Geophys. Mon. 10 (Natl. Acad. Sci., Natl. Research Council Pub, 1467), p. 3-27.

______ 1972, Magnetic studies in northern Lake Superior: Canadian Jour, Earth Sci., v. 9, p. 1349-1367.

Halls, H. C., and West, G. F., 1971, A seismic refraction survey in Lake Superior: Canadian Jour. Earth Sci., v. 8, p. 610-630.

Hamblin, W. K., and Horner, W. J., 1961, Sources of the Keweenawan conglomerates of northern Michigan: Jour. Geology, v. 69, p. 204-211.

Hinze, W. J., Davidson, D. M., and Roy, R. F., 1971, Continental rifts [abs.], in Inst. Lake Superior Geology, 17th Ann., 1971, Abs. and Field Guides: Duluth, Minn., p. 29.

Houghton, Douglas, 1841, [Fourth] annual report of the State Geologist: Michigan House of Representatives [Doc.] no. 27, 184 p.

Hubbard, H. A., 1968, Stratigraphic relationships of some Keweenawan rocks of Michigan and Wisconsin [abs.], in Inst. Lake Superior Geology, 14th Ann., 1968, Superior, Wisc., p. 35-151;36.

Huber, N. K., 1973a, Glacial and postglacial geologic history of Isle Royale National Park: U.S. Geol. Survey Prof. Paper 754—A, 15 p.

1973b, Geologic map of Isle Royale National Park: U.S. Geol. Survey Misc. Geol. Inv. Map. I—796, scale 1:62,500.

Irvine, T. N., and Baragar, W. R. A., 1971, A guide to the chemical classification of the common volcanic rocks: Canadian Jour. Earth Sci., v.8, p. 523-151;548.

Irving, R. D., 1883, The copper-bearing rocks of Lake Superior: U.S. Geol. Survey Mon. 5, 464 p.

Irving, R. D., and Chamberlin, T. C., 1885, Observations on the junction between the Eastern Sandstone and the Keweenaw Series on Keweenaw Point, Lake Superior: U.S. Geol. Survey Bull, 23, 124 p.

Jackson, C. T., 1849, Geological and mineralogical reports: U.S. 31st Cong., 1st sess., House Ex. Doc. 5, p. 371-151;935.

Jackson, K. C., 1970, Textbook of lithology: New York, McGraw-Hill Book Co., 552 p.

James, H. L., 1972, Subdivision of Precambrian: an interim scheme to be used by U.S. Geological Survey: Am. Assoc. Petroleum Geologists Bull., v. 56, no. 6, p. 1128-1133.

Johannsen, Albert, 1939, A descriptive petrography of the igneous rocks, v. 1: Chicago, Univ. Chicago Press, 318 p.

King, E. R., and Zietz, Isidore, 1971, Aeromagnetic study of the Midcontinent Gravity High of central United States: Geol. Soc. American Bull,, v. 82, no. 8, p. 2187-151;2208.

Lane, A. C., 1898, Geological report on Isle Royale, Michigan: Mich. Geol. Survey, v. 6, pt. 1, 281 p.

______ 1911, The Keweenaw series of Michigan: Michigan Geol. and Biol. Survey. Pub. 6, Geol. Ser. 4, 2 vols., 983 p.

Lane, A. C., and Seaman, A. E., 1907, Notes on the geological section of Michigan; Part 1, the pre-Ordovician: Jour. Geol., v. 15, no, 7, p. 680-695.

Lyons, P. L., 1970, Continental and ocean geophysics, in Johnson, Helgi, and Smith, B. L., eds., The megatectonics of continents and oceans: New Brunswick, N. J., Rutgers Univ. Press, p. 147-166.

Palmer, H. C., 1970, Paleomagnetism and correlation of some Middle Keweenawan rocks, Lake Superior: Canadian Jour. Earth Sci., v. 7, no, 6, p. 1410-1436.

Pettijohn, F. J., 1970, The Canadian Shield—A status report.

______ 1970, in Baer, A. J., ed., Basins and geosynclines of the Canadian Shield—symposium, Ottawa, 1970: Canada Geol. Survey Paper 70—40, p. 239-255.

Ross, C. S., 1941, Origin and geometric form of chalcedony-filled spherulites from Oregon: Am. Mineralogist, v. 26, no. 12, p. 727-732.

Shapiro, Leonard, 1967, Rapid analysis of rocks and minerals by a single-solution method, in Geological Survey research 1967: U.S. Geol. Survey Prof. Paper 575-B, p. 187-191.

Shaw, H. R., and Swanson, D. A., 1970a, Speculations on the fluid mechanical history of Yakima Basalt flows [abs.], in Columbia River Basalt Symposium: 2d, Cheney, Wash. 1969, Proc., p. 330.

______ 1970b, Eruption and flow rates of flood basalts, in Columbia River Basalt Symposium: 2d, Cheney, Wash. 1969, Proc., p. 271-299.

Silver, L. T., and Green, J. C., 1972, Time constants for Keweenawan igneous activity [abs.]: Geol. Soc. America Abstracts with Programs, v. 4, no. 7, p. 665-666.

Tanton, T. L., 1931, Fort William and Port Arthur, and Thunder Cape map areas, Thunder Bay District, Ontario: Canada Geol. Survey Mem. 167, 222 p.

U.S. Geological Survey, 1957, Topographic map of Isle Royale National Park, Michigan (culture revised 1970): scale 1:62,500, contour and shaded-relief editions.

Van Hise, C. R., and Leith, C. K., 1911, The geology of the Lake Superior region: U.S. Geol. Survey Mon. 52, 641 p.

White, W. S., 1952, Imbrication and initial dip in a Keweenawan conglomerate bed: Jour. Sed. Petrology, v. 22, no. 4, p. 189-199.

______ 1960, The Keweenawan lavas of Lake Superior, an example of flood basalts: Am. Jour. Sci., v. 258-A, Bradley vol., p. 367-374.

______ 1966a, Tectonics of the Keweenawan Basin, western Lake Superior region: U.S. Geol. Survey Prof. Paper 524-E, 23 p.

______ 1966b, Geologic evidence for crustal structure in the western Lake Superior basin, in The earth beneath the continents—a volume of geophysical studies in honor of Merle A. Tuve: Am. Geophys. Union Geophys. Mon. 10 (Natl. Acad. Sci., Natl. Research Council Pub. 1467), p. 28-41.

______ 1968, The native copper deposits of northern Michigan, in Ridge, J. D., ed., Ore deposits of the United States, 1933-1967, v. 1: New York, Am. Inst. Mining, Metall., and Petroleum Engineers, p. 303-326.

______ 1971, Geologic setting of the Michigan copper district, in Soc. Econ. Geologists, Guidebook for field conference, Michigan copper district, 1971: p. 3-17.

______ 1972, The base of the upper Keweenawan, Michigan and Wisconsin: U.S. Geol. Survey, Bull. 1354-F, 23 p.

White, W. S., Brooks, E. R., Hubbard, H. A., Johnson, R. F., and Wilband, J. T., 1971, Keweenawan stratigraphy of westernmost Michigan, in Inst. Lake Superior Geology, 17th Ann., 1971, Abs. and Field Guides: Duluth, Minn., p. 71-72.

White, W. S., Cornwall, H. R., and Swanson, R. W., 1953, Bedrock geology of the Ahmeek quadrangle, Michigan: U.S. Geol. Survey Geol. Quad, Map GQ—27, scale 1:24,000.

White, W. S., and Wright, J. C., 1960, Lithofacies of the Copper Harbor Conglomerate, northern Michigan, in Geological Survey research 1960: U.S. Geol. Survey Prof. Paper 400-B, p. B5-B8.

Winchell, N. H., 1897, Some new features in the geology of northeastern Minnesota: Am. Geologist, v. 20, p. 41-51.

Wold, R. J., and Ostenso, N. A., 1966, Aeromagnetic, gravity, and subbottom profiling studies in Western Lake Superior, in The earth beneath the continents—a volume of geophysical studies in honor of Merle A. Tuve: Am. Geophys. Union Geophys. Mon. 10 (Natl. Acad. Sci., Natl. Research Council Pub. 1467), p. 66-94.

Wolff, R. G., and Huber, N. K., 1973, The Copper Harbor Conglomerate (middle Keweenawan) on Isle Royale, Michigan, and its regional implications: U.S. Geol. Survey Prof. Paper 754—B, 15 p.