|Name||Cow Creek Limestone, Hammett Shale, and Sycamore Sand, undivided|
|Geologic age||Early Cretaceous|
Sedimentary > Carbonate > Limestone (Bed)
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.|
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.
|Counties||Blanco - Burnet - Hays - Travis|