younger volcanic rocks of Davis Mountains area including Brooks Mountain, Goat Canyon, Medley, Barrel Springs, Wild Cherry, Eppenaurer Ranch, Mount Locke, and Merrill Formations (TXOGd;0)

State	Texas
Name	younger volcanic rocks of Davis Mountains area including Brooks Mountain, Goat Canyon, Medley, Barrel Springs, Wild Cherry, Eppenaurer Ranch, Mount Locke, and Merrill Formations
Geologic age	Phanerozoic \| Cenozoic \| Tertiary \| Oligocene-Early
Original map label	Od
Comments	porphyritic trachyte, latite porphyry, vitric tuff, porphyritic rhyolite, basalt, quartz trachyite, and foliated vitrophyre.
Primary rock type	trachyte
Secondary rock type	rhyolite
Other rock types	tuff; latite
Lithologic constituents	Major Igneous > Volcanic > Felsic-volcanic > Trachyte Minor Igneous > Volcanic > Felsic-volcanic > Rhyolite Incidental Igneous > Volcanic > Mafic-volcanic > Basalt Igneous > Volcanic > Felsic-volcanic > Latite
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, 1968, Van Horn-El Paso Sheet, Geologic Atlas of Texas: Bureau of Economic Geology, The University of Texas at Austin, scale 1:250,000. Henry, C.D. and McDowell, F.W., 1986, Geochronology of magmatism in the Tertiary volcanic field, Trans-Pecos, Texas, in Price, J.G. and others, eds., Igneous geology of Trans-Pecos, Texas: The University of Texas at Austin, Bureau of Economic Geology Gui Henry, C.D., McDowell, F.W., Price, J.G., and Smyth, R.E., 1986, Geochronology of Tertiary igneous rocks, Trans-Pecos, Texas, in Price, J.G. and others, eds., Igneous geology of Trans-Pecos, Texas: The University of Texas at Austin, Bureau of Economic Ge
Geographic coverage	Jeff Davis - Pecos - Presidio - Reeves