Cow Creek Limestone, Hammett Shale, and Sycamore Sand, undivided

Cow Creek Limestone, Hammett Shale, and Sycamore Sand, undivided
State Texas
Name Cow Creek Limestone, Hammett Shale, and Sycamore Sand, undivided
Geologic age Early Cretaceous
Lithologic constituents
Major
Sedimentary > Carbonate > Limestone (Bed)
Minor
Sedimentary > Clastic > Mixed-clastic > Sandstone-mudstone (Bed)
Sedimentary > Clastic > Mudstone > Shale > Black-shale (Bed)
Comments Cow Creek Limestone--limestone, massive, off-white,in part honeycombed (coquinite with fossils dissolved), fossiliferous; thicknes about 60 ft, lower part covered. Hammett Shale--sandy and silty, med.gray, oyster beds, at base gravel of Ellenberger rocks; thickness 60 ft. Sycamore Sand--sand, silt, clay, and conglomerate of variable thickness.
References

Bureau of Economic Geology, 1981, Llano sheet, Geologic Atlas of Texas, Bureau of Economic Geology, 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 Blanco - Burnet - Hays - Travis