Jackson Group, undivided

Jackson Group, undivided
State Texas
Name Jackson Group, undivided
Geologic age Oligocene and Eocene
Lithologic constituents
Major
Unconsolidated > Fine-detrital > Clay (Bed)
Minor
Sedimentary > Clastic > Sandstone (Bed)
Incidental
Sedimentary > Clastic > Siltstone (Bed)
Comments clay, sandstone, siltstone, and tuff. as much as 875 ft thick, mapped generally south of Frio River
References

Bureau of Economic Geology, 1974, Seguin Sheet, Geologic Atlas of Texas, University of Texas, Bureau of Economic Geology, scale 1:250,000.

Bureau of Economic Geology, 1966, Texarkana Sheet, Geologic Atlas of Texas, University of Texas, Bureau of Economic Geology, 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 Duval - Jim Hogg - La Salle - McMullen - Starr - Webb - Zapata