Bullard Dome, Bullard, Smith Co., Texas, USA
Latitude & Longitude (WGS84): | 32° 9' 20'' North , 95° 17' 38'' West |
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Latitude & Longitude (decimal): | 32.15573,-95.29413 |
Köppen climate type: | Cfa : Humid subtropical climate |
A salt-gypsum-limestone deposit located 3.2 km (2.0 miles) NE of Bullard, on private land. Discovered in 1927. MRDS database stated accuracy for this location is .
Mineralization is a salt dome deposit (Mineral occurrence model information: Model code: 252; USGS model code: 35a.4 (35ad); Deposit model name: Salt domes: diapiric salt structures), hosted in the Late Jurassic Louann Salt and limestone. The ore body is a diapir at a thickness of 6,705.6 meters, width of 4,023.25 meters, length of 4,184.18 meters and a depth-to-top of 114.3 meters. Local rocks include Queen City Sand. The caprock is 145 to 152 feet thick. The depth to caprock is 375 feet, and to the salt it is 527 feet, and to the Louann salt it is 22,000 feet. Surface expression is 5 square miles. This deposit is also classified as USGS model Gypsum (35A.6), limestone.
Local geologic structures include doming.
Reserve-Resource data are found in: Halbouty, Michel T. (1979); American Association of Petroleum Geologists (1983), Bulletin: 67.
Commodity List
This is a list of exploitable or exploited mineral commodities recorded at this locality.Mineral List
3 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
Middle Eocene 38 - 47.8 Ma ID: 2888246 | Queen City Sand Age: Eocene (38 - 47.8 Ma) Stratigraphic Name: Queen City Sand Comments: In East Texas and Gulf Coast to Rio Grande- Quartz sand and clay; sand fine grained to locally med. grained, lt. gray to brownish-gray, locally carbonaceous. Clay, gray to brown, silty, sl. lignitic, sand most abdt to west; weathers red and white mottled; ironstone concretions and ledges common; local beds of glauconite-quartz greensand, crossbedded, weathers ferruginous ledges and rubble; 100-400 ft thick. In north, central, and south Texas including Quaternary for all of west Texas- sandstone and siltstone; sandst. fine to med grained, well sorted, noncalcar., friable to indurated, massive, laminated, local beds of glauconite-quartz greensand, crossbedded; siltst. lt. gray, friable, thin interbeds of clay; thickness 250-500 ft Lithology: Major:{siltstone,sandstone}, Minor:{claystone} 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] |
Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License