| State | Texas |
|---|---|
| Name | Miocene intrusive rocks |
| Geologic age | Miocene |
| Lithologic constituents |
Major
Igneous > Hypabyssal > Mafic-hypabyssal > Hypabyssal-basalt (Dike or sill)
Minor
Igneous > Hypabyssal > Felsic-hypabyssal > Hypabyssal-rhyolite (Dike or sill)
Incidental
Igneous > Plutonic > Gabbroic > Gabbro (Stock or pipe)
Igneous > Plutonic > Granitic > Granodiorite (Stock or pipe)
|
| Comments | large intrusion of alkali basalt at Black Hills, southern Presidio County, TX in Bofecillos Mountains (Henry and others, 1998, p. 44) |
| References | 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.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 | Presidio |