| State | Texas |
|---|---|
| Name | Van Horn Sandstone |
| Geologic age | preCambrian (Proterozoic); Grenville Series |
| Lithologic constituents |
Major
Sedimentary > Clastic > Sandstone > Arkose (Bed)Mostly sandstone and arkose, medium to coarse grained, thick bedded, cross-bedded,yellowish brown to purplish red; scattered pebbles and cobbles; few beds of conglomerate
Minor
Sedimentary > Clastic > Conglomerate (Bed, Arkosic)Lower part of Van Horn is mostly conglomerate, well-rounded pebbles to boulders, closely packed to widely dispersed in an arkosic sandy matrix; some sandstone beds. Shows angular discordance with underlying Bliss. Thickness variable, max. 800 ft.
|
| Comments | Thick-bedded, red, arkosic ss. containing many beds of conflomerae, having a maxiumum thickness of about 700 ft. Closely resembles the underlying Hazel Sandstone. The conglo. in the Van Harn consis of smoothly rounded pebbles and cobbles made largely of igneous rocks. Van Horn rests on the truncated edges of the Allamoore and Hazel, and was deposited long after they were folded. |
| References | King, P.B., 1940, Older rocks of the Van Horn region, Texas: American Association of Petroleum Geologists Bulletin, v. 24, no. 1 p. 143-156.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 | Culberson - Hudspeth |