02706oam 2200685 450 991070734920332120160720134248.0(CKB)5470000002464026(OCoLC)889715991(EXLCZ)99547000000246402620140901d1992 ua 0engurmn|||||||||txtrdacontentcrdamediacrrdacarrierRevisions of stratigraphic nomenclature within the Keweenawan supergroup of northern Michigan /by William F. Cannon and Suzanne W. Nicholson. Geochemistry, petrography, and volcanology of rhyolites of the Portage Lake volcanics, Keweenaw Peninsula, Michigan / by Suzanne W. Nicholson[Reston, Va.] :U.S. Department of the Interior, U.S. Geological Survey,1992.[Washington, D.C.] :United States Government Printing Office.1 online resource (various pagings) illustrations, mapsU.S. Geological Survey bulletin ;1970 A-BContributions to the geology and mineral resources of the midcontinent rift systemTitle from title screen (viewed Aug. 25, 2014).Includes bibliographical references.Geology, StratigraphicProterozoicRhyoliteMichiganKeweenaw PeninsulaVolcanic ash, tuff, etcMichiganGeology, StratigraphicfastProterozoic Geologic PeriodfastRhyolitefastVolcanic ash, tuff, etcfastBergland Group (Mich.)Copper Harbor Conglomerate (Mich.)Porcupine Volcanics (Mich.)Portage Lake Volcanics (Mich.)MichiganfastMichiganBergland GroupfastMichiganCopper Harbor ConglomeratefastMichiganKeweenaw PeninsulafastMichiganPorcupine VolcanicsfastMichiganPortage Lake VolcanicsfastGeology, StratigraphicRhyoliteVolcanic ash, tuff, etc.Geology, Stratigraphic.Proterozoic Geologic Period.Rhyolite.Volcanic ash, tuff, etc.Cannon William F.1385819Nicholson Suzanne W.Geological Survey (U.S.),COPCOPOCLCOOCLCFGPOBOOK9910707349203321Revisions of stratigraphic nomenclature within the Keweenawan supergroup of northern Michigan3479222UNINA