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Duff Formation (with Decie Member from Paisano caldera shown separately), Cottonwood Springs Basalt, Potato Hill Andesite, Sheep Canyon Basalt, Crossen Trachyte, and Pruett Formation, undivided

Duff Formation (with Decie Member from Paisano caldera shown separaetly), Cottonwood Springs Basalt, Potato Hill Andesite, Sheep Canyon Basalt, Crossen Trachyte, and Pruett Formation, undivided
StateTexas
NameDuff Formation (with Decie Member from Paisano caldera shown separately), Cottonwood Springs Basalt, Potato Hill Andesite, Sheep Canyon Basalt, Crossen Trachyte, and Pruett Formation, undivided
Geologic agePhanerozoic | Cenozoic | Tertiary | Eocene-Late Oligocene-Early
Original map labelOEd
Commentsin west Brewster Co., rhyolitic tuff, minor sandstone, conglomerate and mafic flows, felsic flows, and flow breccia. mafic flows, anygdaloidal, vesicular, andesitic flow breccia, porphyritic mafic flows, thin tuff and nonmarine limestone, prophyritic quartz trachyte, tuff, tuffaceous sandstone, conglomerate breccia, tuffaceous nonmarine limestone. Pruett Fm., about 330 ft thick in Fort Stockton Sheet (1982), mostly volcanic tuff, some tuffaceous sandstone, conglo., breccia, and tuffaceous fresh-water limestone which interfingers with other units named in this map unit. Thickness more than 4,500 ft.
Primary rock typerhyolite
Secondary rock typebasalt
Other rock typestuff; sandstone; conglomerate; limestone
Lithologic constituents
Major
Igneous > Volcanic > Felsic-volcanic > Rhyolite (Pyroclastic, ash-flow)
Minor
Sedimentary > Clastic > Mixed-clastic > Siltstone-Mudstone
Igneous > Volcanic > Felsic-volcanic > Trachyte
Igneous > Volcanic > Mafic-volcanic > Basalt
Incidental
Sedimentary > Clastic > Conglomerate (Tuffaceous)
Sedimentary > Clastic > Sandstone (Tuffaceous)
Sedimentary > Carbonate > Limestone (Tuffaceous)
Map references
Bureau of Economic Geology, 1992, Geologic Map of Texas: University of Texas at Austin, Virgil E. Barnes, project supervisor, Hartmann, B.M. and Scranton, D.F., cartography, scale 1:500,000
Unit references
Bureau of Economic Geology, 1982, Fort Stockton Sheet, Geologic Atlas of Texas, University of Texas at Austin, scale 1:250,000.
Bureau of Economic Geology, 1979, Emory Peak--Presidio Sheet, Geologic Atlas of Texas, University of Texas at Austin.
Geographic coverageBrewster - Jeff Davis - Presidio

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