Eocene intrusive rocks (TXEOi;0)

State	Texas
Name	Eocene intrusive rocks
Geologic age	Phanerozoic \| Cenozoic \| Tertiary \| Eocene
Original map label	Ei
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-quartz-trachyte (Stock or pipe) Igneous > Hypabyssal > Mafic-hypabyssal > Hypabyssal-basalt (Stock or pipe) Igneous > Hypabyssal > Felsic-hypabyssal > Hypabyssal-latite (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.
Geographic coverage	Brewster - Culberson - El Paso - Hudspeth - Jeff Davis - Presidio