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Geomorphic and tectonic implications of the postLaramide late Eocene
Controls of sedimentation and provenance of sediments in the Oligocene
Late Cenozoic basaltic volcanism and development of the Rio Grande
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alluvium America Bull andesitic anticline ash-flow basalt basalt flows batholith beds Boulder Browns Park Formation Canyon Cenozoic Cenozoic history central Colorado conglomerate County Creek Cristo Range deposits drainage east eastern Eocene flank fossil Front Range Geologic map graben Hanna Formation igneous intrusive Izett Laramide Laramie basin late Cenozoic late Eocene surface lava Lipman m.y. ago m.y. old magma Medicine Bow Mountains Mexico Middle Park middle Tertiary Mile volcanic field Miocene Neogene northern Ogallala Oligocene orogeny Paleocene paleovalleys Paleozoic Paper Park Range Peak Plateau Pliocene Precambrian Precambrian rocks quadrangle Rio Grande depression River Formation San Juan Mountains San Luis Valley sandstone Sangre de Cristo Sawatch Range sedimentary rocks sediments Shale South Park Southern Rocky Mountains stratigraphic structural Survey Bull Survey Prof tectonic thick Thirtynine Mile volcanic tholeiitic Tweto U.S. Geol Uinta unconformity uplift volcanic field volcanic rocks Wall Mountain Tuff western Wet Mountains White River Wyoming