| State | Texas |
|---|---|
| Name | Eocene intrusive rocks |
| Geologic age | Eocene |
| 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)
|
| 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 |
| 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.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 | |
| Counties | Brewster - Culberson - El Paso - Hudspeth - Jeff Davis - Presidio |