| State | Texas |
|---|---|
| Name | Javelina Member of Tornillo Formation |
| Geologic age | Late Cretaceous and Paleocene |
| Lithologic constituents | Major
Unconsolidated > Fine-detrital > Clay (Bed)
Sedimentary > Clastic > Sandstone (Bed)
|
| Comments | Clay and sandstone. Clay bentonitic, mostly structureless, nodular calcareous concretions common, dull gray, olive green, deep dark-red, weathers into rounded topographic forms; sandstone, lenticular, crossbedded, repple marked, vertebrate fossisl and petrified wood common. Thickness 244-936 ft; exposed in Big Bend N.P. and northward. |
| References | Bureau of Economic Geology, 1979, Emory Peak--Presidio Sheet, Geologic Atlas of Texas, University of Texas at Austin.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 |