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abstract Acad Alaska America Bull Appalachian Valley Assoc Basin British Columbia Butte California Dept Canada Canadian Canyon Charles coal Colorado County Cret Cretaceous Dakota deposits as related Devonian Econ Eocene fauna figs Foraminifera fossil gas field Geol Geophysics glacial Hills Historical geology Idaho Illinois incl index map Inst Iowa isopach maps John July June Kansas Keyes Lake area Manganese Meteorites Mexico Mineralogist minerals Mines Bull mining dist Miocene Nevada Newhouse North America oil and gas oil field Calif Oklahoma Ontario Ordovician Paleontology Paleozoic pegmatites Pennsylvania Permian Petroleum Geologists Bull Petrology Pleist Pliocene Proc quad Quebec Rept River Robert rocks Ross Science n.s. sediments Sept sketch maps South Dakota Stratigraphic Streator structural features Survey Bull Texas tungsten U. S. Geol Univ Valley Virginia Washington William Willman Wilson York