Duff Formation, Decie Member from Paisano caldera (TXOGde;0)

State	Texas
Name	Duff Formation, Decie Member from Paisano caldera
Geologic age	Phanerozoic \| Cenozoic \| Tertiary \| Oligocene-Early
Original map label	Ode
Comments	volcanic rock from Paisano volcano, 5 units, young to old: 1) lava, agglomeratic tuff, conglomerate, ash-flow tuff. 2) ash-flow tuff. 3) aphyric to sl. porphyritic quartz trachyte 4) yellow aggomeratic tuff interlayered with two minor quartz trachyte ash-flow sheets 5) rhyolite lava
Primary rock type	rhyolite
Secondary rock type	trachyte
Other rock types	tuff; conglomerate
Lithologic constituents	Major Igneous > Volcanic > Felsic-volcanic > Trachyte Minor Igneous > Volcanic > Felsic-volcanic (Pyroclastic, ash-flow) Incidental Sedimentary > Clastic > Conglomerate
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.
Geographic coverage	Brewster - Jeff Davis - Presidio