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Georgetown, Williamson Co., Texas, USA

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Latitude & Longitude (WGS84): 30° 37' 58'' North , 97° 40' 38'' West
Latitude & Longitude (decimal): 30.63278,-97.67722
GeoHash:G#: 9v6w3298g
Köppen climate type:Cfa : Humid subtropical climate


A populated place (town).


Commodity List

This is a list of exploitable or exploited mineral commodities recorded from this region.


Mineral List

Mineral list contains entries from the region specified including sub-localities

4 valid minerals.

Regional Geology

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

Late Cretaceous
66 - 100.5 Ma



ID: 2829671
Del Rio Clay and Georgetown Limestone, undivided

Age: Late Cretaceous (66 - 100.5 Ma)

Stratigraphic Name: Del Rio Clay; Georgetown Limestone

Comments: Del Rio Clay--calcareous and gypsiferous, pyrite common, blocky, med. gray, weathers lt gray to yell-gray; some thin lenses of highly calcareous siltst.; marine megafossils include abdt Exogyra arietina and other pelecypods; thickness 40-70 ft in Austin Sheet (1974). Georgetown Limestone--limestone and marl; mostly limestone, fine grained, argillaceous, nodular, mod indurated, lt gray; some ls brittle and thick bedded, white; some shale, marly, soft, marine megafossils include Kingena wacoensis and Gryphaea washitaensis; thickness 30-80 ft, thins southward in Austin Sheet.

Lithology: Major:{clay,limestone}, Incidental:{marl}

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. [133]

Early Cretaceous
100.5 - 145 Ma



ID: 3186170
Mesozoic sedimentary rocks

Age: Early Cretaceous (100.5 - 145 Ma)

Lithology: Carbonate,shale

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License


Localities in this Region
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