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Burnam Limestone

Burnam Limestone NOTE: This unit is represented within the map unit explanation of (Geol. Map of Texas, 1992, Bur. Econ. Geol.) but does not occur on the map and is NOT included in the spatial data.
State Texas
Name Burnam Limestone
Geologic age Phanerozoic | Paleozoic| Ordovician-Late
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
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.
Bureau of Economic Geology, 1981, Llano sheet, Geologic Atlas of Texas, Bureau of Economic Geology, University of Texas at Austin, scale 1:250,000.