South Fork San Gabriel River occurrence, Georgetown, Williamson Co., Texas, USA
|Latitude & Longitude (WGS84):||30° 37' 16'' North , 97° 51' 43'' West|
|Latitude & Longitude (decimal):||30.62126,-97.86210|
|Köppen climate type:||Cfa : Humid subtropical climate|
An Sr occurrence located at US highway 183 bridge over the South Fork San Gabriel River, 17.7 km (11.0 miles) W of Georgetown.
1 valid mineral.
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
100.5 - 145 Ma
Age: Early Cretaceous (100.5 - 145 Ma)
Stratigraphic Name: Walnut Clay
Comments: Clay, limestone, and shale; clay, calcareous; limestone, chalky, marly, nodular, thick bedded, a few hard beds with sparry calcite, massive beds of Texigryphaea common in lower part; shale as thin beds most common in upper part; thickness 125-175 ft.
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.