|Name||Wilberns Formation showing San Saba Member|
|Geologic age||Late Cambrian|
Sedimentary > Carbonate > Dolostone (Bed)
Sedimentary > Carbonate > Limestone (Bed)
|Comments||Dolomite and limestone, thickly to thinly bedded; dolomite is mostly sparsely cherty; ls. moderately glauconitic. In SE area dolomite, fine- to v. fine grained, yellowish-gray to brownish-gray and medium-gray; NW mottled ls. in part girvanella-bearing, comes in at base. In NW area mostly ls., chiefly granular, moderately glauconitic, light- to medium-gray and greenish-gray, locally stromatolitic bioherms in lower part become dolomite westward and thicken into a north-south reef extending almost to the top of the San Saba, west of the reef many sandstone beds characterize the upper part of the Member; fossils are mostly calcitic trilobites in ls., some gastropods; Thickness 215 to 325 ft.|
|Stratigraphic units||Moore Hollow Group|
Bureau of Economic Geology, 1981, Llano sheet, Geologic Atlas of Texas, Bureau of Economic Geology, University of Texas at Austin, scale 1:250,000.
Bridge, J., Barnes, V.E., and Cloud, P.E., Jr., 1947, Stratigraphy of the Upper Cambrian, Llano uplift, Texas: Geological Society of America Bulletin v.56, no. 1, p. 109-123.
Bureau of Economic Geology, 1976, Brownwood 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 - Gillespie - Llano - McCulloch - Mason - San Saba|