| State | Texas |
|---|---|
| Name | Jones Basalt |
| Geologic age | Oligocene |
| Lithologic constituents | Major
Igneous > Volcanic > Mafic-volcanic > Basalt
|
| Comments | in central and northern and southern Davis Mtns, Jeff Davis Co., north and around Marfa, TX. previous mapped as Petan Basalt - -mafic flows, trachyandesite porphyry, dk. greenish gray to brownish gray; thickness as much as 510 ft to west on Marfa Sheet (1979) |
| Stratigraphic units | Bell Valley Andesite, Jones Formation of southern Davis Mountains |
| References | 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, 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 - Jeff Davis - Presidio |