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	Early Oligocene
Lithologic constituents	Major Igneous > Volcanic > Felsic-volcanic > Trachyte Minor Igneous > Volcanic > Felsic-volcanic > Rhyolite Incidental Igneous > Volcanic > Felsic-volcanic > Latite Igneous > Volcanic > Mafic-volcanic > Basalt
Comments	porphyritic trachyte, latite porphyry, vitric tuff, porphyritic rhyolite, basalt, quartz trachyite, and foliated vitrophyre.
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 Guidebook 23, p. 99-122. 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 Geology Circular 86-2, 34 p. 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.
NGMDB product	NGMDB product page for 68390
Counties	Jeff Davis - Pecos - Presidio - Reeves

State

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

Early Oligocene

Lithologic constituents

Major

Igneous > Volcanic > Felsic-volcanic > Trachyte

Minor

Igneous > Volcanic > Felsic-volcanic > Rhyolite

Incidental

Igneous > Volcanic > Felsic-volcanic > Latite

Igneous > Volcanic > Mafic-volcanic > Basalt

Comments

porphyritic trachyte, latite porphyry, vitric tuff, porphyritic rhyolite, basalt, quartz trachyite, and foliated vitrophyre.

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 Guidebook 23, p. 99-122.

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 Geology Circular 86-2, 34 p.

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.

NGMDB product

NGMDB product page for 68390

Counties

Jeff Davis - Pecos - Presidio - Reeves