|Geologic age||Early Ordovician|
Sedimentary > Carbonate > Dolostone (Bed)
Sedimentary > Carbonate > Limestone (Bed)
|Comments||Limestone and dolomite, thickly to thinly bedded, cherty; ls. aphanitic, lt-gray; dolomite mostly fine-grained to microgranular, lt- to medium-gray and yellowish-gray to brownish-gray; fossils perserved in chert include trilobites, cephalopods, the sponge Archaeoscyphia and gastropods including silicified Ceratopea; thickness 680 ft in SE area, truncated to NW by erosion.|
|Stratigraphic units||Ellenberger Group|
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 - Lampasas - Llano - San Saba|