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abundant alteration Archean arkose bands basal conglomerate beds Big Limestone biotite carbonate chert chlorite Copps formation correlation deposition diabase dolomite drill holes east epidote exposures fault feet feldspar ferruginous slate folding gabbro garnet gneiss Gogebic range granite gray graywacke green hornblende green schist greenstone ground mass Gwinn series Gwinn synclinorium hills Hise horizon hornblende Huronian series igneous intrusive iron formation Ironwood formation Keweenawan kyanite layers Limestone Little Lake Little Limestone locality Lower Huronian magnetic belt magnetite Manitowish range Marenisco Marquette range Menominee metamorphic mica schist Michigan Middle Huronian Animikie miles minerals Negaunee NWj of section outcrops Paint slate Palms formation parallel pre-Cambrian Presque Isle granite probably pyrite quartz quartz slate quartzite rocks sandstone schist schistosity section 20 sedimentary sediments sericite structure syncline synclinorium texture thickness thin section tion Turtle range U. S. Geological Survey Unconformity Upper Huronian vicinity volcanic Wisconsin Wolf Lake
Page 3 - LETTER OF TRANSMITTAL To the Honorable, the Board of Geological and Biological Survey of the State of Michigan: Gov.
Page 3 - DIRECTOR, RC ALLEN. SCIENTIFIC ADVISORS. Geologists.— Dr. LL Hubbard, Houghton; Prof. WH Hobbs, Ann Arbor; Prof. WH Sherzer, Ypsilanti. Botanists. — Prof. EA Bessey, East Lansing; Prof. FC Newcombe, Ann Arbor. Zoologists. — Prof. WB Barrows, East Lansing; Prof. J. Reighard, Ann Arbor; Dr. Bryant Walker, Detroit.
Page 39 - ... formations. The Lower Huronian is overlain unconformably by the Palms formation of the Middle Huronian. The evidence of this relationship does not refer to any one locality but is based largely on general field relations, and particularly upon a lack of continuity of the Lower Huronian formations which is believed to be due to erosion preceding the deposition of the Upper Huronian. Van Hise and Leith** summarize the evidence as follows: "The fact that where the belt of conglomerate at the base...
Page 3 - THE SUPERINTENDENT OF PUBLIC INSTRUCTION, HON. FRED L. KEELER. THE PRESIDENT OF THE STATE BOARD OF EDUCATION, HON. THOMAS W. NADAL.
Page 27 - Negaunee on the assumption of practical continuity with the Vulcan formation of the Crystal Falls district to the south and lack of continuity with the Negaunee formation a few miles northward.
Page 31 - Menominee) presenting similar puzzling relations with beds known to be Huronian, and younger as well as lithologically different from any rock then known to be of that period. "A careful consideration of all of the facts to be observed in the Menominee region confirms me in this hypothesis, "*- The conclusion of Brooks is confirmed by the work of Hotchkiss in the Florence district of Wisconsin in...