Burnam Limestone (TXOb;0)

State	Texas
Name	Burnam Limestone
Geologic age	Phanerozoic \| Paleozoic\| Ordovician-Late
Original map label	Ob
Comments	Very coarse-grained, yellowish- to lt-brownish-gray or almost white, mostly fossil debris enlarged by calcite, producing grains up to 5 mm in size, fossils include stromatoporoids, corals, brachiopods, bryozoa, cephalopods, pelecypods, and trilobites; crops out on R.M. Burnam Ranch along Burnam Branch and vicinity 4.7 mi airline S-SE of Marble Falls. Small outcrop marked with a x on the state geologic map.
Primary rock type	limestone
Secondary rock type
Other rock types
Lithologic constituents	Major Sedimentary > Carbonate > Limestone (Bed)contains pale yellowish-orange stylolites and angular to rounded pebbles and blebs of fine-grained yellowish-gray to peralr-gray limestone; thickness unknown; outcrops are collapsed into older rocks
Map references	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
Unit references	Wilmarth, M.G., 1938, Lexicon of geologic names of the United States: U.S. Geological Survey Bulletin 896, 2396 p. [http://pubs.er.usgs.gov/publication/b896] Bureau of Economic Geology, 1981, Llano sheet, Geologic Atlas of Texas, Bureau of Economic Geology, University of Texas at Austin, scale 1:250,000.