|Latitude & Longitude (WGS84):||30° 43' 27'' North , 98° 28' 26'' West|
|Latitude & Longitude (decimal):||30.72410,-98.47394|
|Köppen climate type:||Cfa : Humid subtropical climate|
|Other/historical region names associated with this locality:||Badu Hill Mine, Badu Hill Quarry|
A REE-U-Th-Co-Au-Ag-Cu-Pb-Ti-As-Gd-Zr-W pegmatite occurrence located 13 miles east of Llano, SW of Buchanan Dam.
37 valid minerals.
Rock Types Recorded
Select Rock List TypeAlphabetical List Tree Diagram
This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.
Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org
541 - 2500 Ma
|Town Mountain Granite|
Age: Proterozoic (541 - 2500 Ma)
Stratigraphic Name: Town Mountain Granite
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.
Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052.