Late Cretaceous Volcanic and Intrusive Rocks Near the Eastern Margins of the Boulder and Tobacco Root Batholiths: Guidebook for Field Trip Held in Conjunction with the 35th Annual Meeting of the Rocky Mountain Section of the Geological Society of America |
Common terms and phrases
10-N pluton alternate stop andesite Archean augite biotite Boulder batholith Boulder River Bozeman breccia Butte Quartz Monzonite Cambrian carbonate coarse-grained cobble conglomerate consists Cottonwood Canyon dikes diorite east Elkhorn Mountains Volcanics emplacement Emvl epiclastic facies fault feet feldspar feldspathic felsic ferromagnesian minerals fine-grained folded Gallatin geologic map gneiss granitic granodiorite guidebook highway hornblende host rock igneous INTRUSIVE ROCKS Jefferson River Jefferson River Canyon Klepper Laramide Lewis and Clark lithologies lower member m.y. ago Madison Range mafic mafic composition mafic sill medium-grained Mesozoic Mesozoic sedimentary rocks metamorphic rocks middle member miles Montana North Doherty complex North Doherty intrusive numbered outcrops Paleozoic Paleozoic and Mesozoic pluton pre-Beltian Precambrian Quartz Monzonite region Schmidt and Hendrix sedimentary rocks sediments shale Smedes STOP 2a stop Figs Tertiary thick Three Forks quadrangle Tkpl Tobacco Root batholith Tobacco Root Mountains Tobacco Root Range tonalite unit H Vitaliano volcanic rocks xenoliths zone