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Terlingua, Terlingua District, Brewster Co., Texas, USA

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Latitude & Longitude (WGS84): 29° 19' 17'' North , 103° 36' 57'' West
Latitude & Longitude (decimal): 29.32159,-103.61602
Köppen climate type:BWh : Hot deserts climate

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Mineral List

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

1 valid mineral.

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

Late Cretaceous - Early Cretaceous
66 - 145 Ma

ID: 2843160
Bouquillas Formation

Age: Cretaceous (66 - 145 Ma)

Stratigraphic Name: Bouquillas Formation

Comments: In Western part of Trans-Pecos Texas, Eastern part of Trans-Pecos Texas and High Plains- limestone, marl and shale. Upper part--interbedded marl and shale; lower part--limestone, silty to sandy, flaggy, dark grayish orange near base; marine megafossils; thickness 200+_ ft. In North, central, and south Texas including Quaternary for all of west Texas- Four units. Upper unit mostly silty shale, med-gray interbedded with nodular to laminar ls. Followed downward by shale, silty interbedded with granular yell-gray ls.; shale silty dk-gray interbedded with laminated siltstone; a basal unit of limest. clastic in thin mostly cross-laminated beds, interbedded with siltstone. Thickness 160-220 ft.

Lithology: Major:{limestone,shale}, Minor:{marlstone,siltstone mudstone}

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, used under Creative Commons Attribution 4.0 License

Localities in this Region


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