|Name||Red Mountain Gneiss|
|Geologic age||preCambrian (Proterozoic)|
Metamorphic > Gneissquartz-microcline-sodic plagioclase rock, pink. Varies widely from distinctly foliated and lineated fine-grained rock to a coarse granite; occurs as many, mostly concordant sills and lenticular bodies in southeast Llano region.
Igneous > Plutonic > Granitic > Alkali-feldspar-granite (Dome)
Igneous > Plutonic > GraniticMetagranite in Cap Mountain area may be related to Red Mountain Gneiss
|Comments||Named for Red Mountain in southeast corner of Llano quadrangle, Llano County, Texas. Metagranite mapped on Cap Mtns. on the Llano 1:250,000 geologic quadrangle map may be related to Red Mountain Gneiss. Qtz-microcline-sodic plagioclase rock, pink; texture and grain size vary widely fr. a fine-grained rock with pronounced foliation and lineation to a coarse granite; occurs as many mostly concordant sills and lenticular bodies in SE part of Llano region|
Paige, S., 1912a, Llano-Burnet, Texas: U.S. Geological Survey, Geologic Atlas of the United States, Folio 183.
Barnes, V.E., [1952?], Geologic map of the Blowout quadrangle, Blanco, Gillespie, and Llano Counties, Texas (1:31,680): University of Texas Bureau of Economic Geology.
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 - Llano|