|Name||Town Mountain Granite|
|Geologic age||preCambrian (Proterozoic)|
Igneous > Plutonic > Granitic > Granite (Pluton)
|Comments||Coarse-grained, pink, quartz-plagioclase-microcline rock, in part porphyritic with large microcline phenocrysts. Occurs in plutons up to 13 mi in size that tend to be concordant circular vertical cylinders with concentric textural variaions; boundaries range from sharp and regular to highly irregular with wide zones of mixed rock. Makes up Enchanted Rock granite mass, Gillespie and Llano Counties.|
Barnes, V.E., Romberg, F., and Anderson, W.A., 1954, 19th International Geologic Congress, Algiers 1952, Comptes rendus, sec. 9, pt. 9, p. 152-153.
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|