Delaho and Rawls Formations, undivided (TXMIOG;0)

State	Texas
Name	Delaho and Rawls Formations, undivided
Geologic age	Phanerozoic \| Cenozoic \| Tertiary \| Oligocene Miocene
Original map label	MO
Comments	sandstone and conglomerate, pebbles dominantly Tule Mountain Trachyandesite, basalt pebbles dominant in upper part to the south (in Emory Peak-Presidio Sheet (1979)); sandst. composed mostly of volcanic rock fragments; festoon crossbedding well developed; Smoky Creek Mbr. thickness as much as 1,100 ft. Lower unnamed member thickness about 1,100 ft, total about 2,200 ft thick. Rawls Fm--conglo., sandst., and tuff; basalt; bolson fill; trachyte; trachyandesite; latite porphyry; trachybasalt porphyry; ash-flow tuff. Rawls Fm as much as 1,200 ft thick.
Primary rock type	sandstone
Secondary rock type	conglomerate
Other rock types	trachyte; trachyandesite; latite; trachybasalt; basalt; ash-flow tuff; mudstone
Lithologic constituents	Minor Igneous > Volcanic > Felsic-volcanic > Trachyte (Flow)ash-flow tuff and tuffaceous sediments Igneous > Volcanic > Felsic-volcanic > Rhyolite (Flow)ash-flow tuff and tuffaceous sediments Incidental Igneous > Volcanic > Mafic-volcanic > Basaltic-andesite (Flow)ash-flow tuff and tuffaceous sediments Igneous > Volcanic > Mafic-volcanic > Basalt (Flow)ash-flow tuff and tuffaceous sediments Igneous > Volcanic > Felsic-volcanic > Latite (Flow)ash-flow tuff and tuffaceous sediments
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, 1979, Emory Peak--Presidio Sheet, Geologic Atlas of Texas, University of Texas at Austin.