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Eocene intrusive rocks

Eocene intrusive rocks
State Texas
Name Eocene intrusive rocks
Geologic age Phanerozoic | Cenozoic | Tertiary | Eocene
Comments stocks, laccoliths, sills, and dikes. Major rock types--basalt, hawaiite, mugearite, trachyte, quartz trachyte, rhyolite, phonolite, latite, trachyandesite, and their coarser grained equivalents, e.g. monzonite, syenite
Primary rock type basalt
Secondary rock type trachyte
Other rock types felsic volcanic rock; rhyolite; phonolite; latite; trachyandesite
Lithologic constituents
Major
Igneous > Volcanic > Felsic-volcanic > Trachyte (Stock or pipe)
Minor
Igneous > Hypabyssal > Felsic-hypabyssal > Hypabyssal-latite (Stock or pipe)
Igneous > Hypabyssal > Mafic-hypabyssal > Hypabyssal-basalt (Stock or pipe)
Igneous > Hypabyssal > Felsic-hypabyssal > Hypabyssal-quartz-trachyte (Stock or pipe)
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, Marfa Sheet, Geologic Atlas of Texas: Bureau of Economic Geology and The University of Texas at Austin, scale 1:250,000.
Counties Brewster - Culberson - El Paso - Hudspeth - Jeff Davis - Presidio