|Name||Javelina Member of Tornillo Formation|
|Geologic age||Late Cretaceous and Paleocene|
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.|
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.