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abundant actinolite albite amphibole Animikie anticline apatite aphanitic Archean arkose Bad River bands basal basic lavas Big Limestone biotite black slate carbonate chert chlorite clastic conglomerate Copps formation correlation Crystal Falls crystals Decorah diabase diorite district dolomite drill holes east ellipsoidal epidote Escanaba exposures fault feet Felch feldspar ferruginous slate fine grained forsterite gabbro garnet gneiss Gogebic Gogebic range grained bands granite gray graywacke green greenschist greenstone grunerite Gwinn Gwinn series hematite horizon hornblende HOUGHTON COUNTY Huronian series igneous rocks intrusive iron bearing iron formation iron range Iron River Ironwood formation Jacobsville Keweenawan kyanite Lake Superior layers Leith Limestone Lithology Little Limestone locality Lower Huronian magnetic belt magnetite Manitowish Manitowish range Marenisco Marquette Menominee Menominee River metamorphic mica mica schist Michigamme Michigan microcline Middle Huronian miles minerals Negaunee olivine Ordovician orthoclase outcrops Paint slate Paleozoic Palms formation pegmatite phenocrysts plagioclase porphyritic pre-Cambrian Presque Isle granite Presque Isle River pyrite quartz quartz slate quartzite River rocks rutile sandstone schist schistosity section 20 section 25 sedimentary sedimentary rocks sediments sericite Sherman Hill siliceous Streptelasma structure syenite syncline synclinorium texture thickness U. S. Geological Survey unconformity Upper Huronian Van Hise Vulcan iron Wisconsin Wolf Lake zoisite
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...