Orchard dome (Orchard Dome Oil and Gas field), Orchard, Fort Bend Co., Texas, USA
|Latitude & Longitude (WGS84):||29° 34' 0'' North , 95° 56' 59'' West|
|Latitude & Longitude (decimal):||29.56667,-95.95000|
|Köppen climate type:||Cfa : Humid subtropical climate|
A salt dome deposit located 4.2 km (2.6 miles) SSE of the city of Orchard. Discovered in 1924 by Texas Gulf Sulfur Company based on a geophysical anomaly (seismic refraction). MRDS database accuracy for this location is not stated.
Mineralization is a salt dome deposit (Mineral occurrence model information: Model code: 255; USGS model code: 35a.7 (35ag); Deposit model name: Salt-dome sulfur), hosted in Middle Jurassic Louann limestone and salt. The depth to caprock is 285 feet, to the salt it is 369 feet, and to the S it is 1,000 feet. The salt volume was calculated at 1.2 cubic miles to 10,000 feet of depth. The sulfur is found in the flanks of the dome. Local rocks include rocks of the Beaumont Formation, areas predominantly clay.
Local geologic structures include a piercement salt dome.
Commodity ListThis is a list of exploitable or exploited mineral commodities recorded from this region.
Mineral ListMineral list contains entries from the region specified including sub-localities
15 valid minerals.
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
0.0117 - 2.588 Ma
|Beaumont Formation, areas predominantly clay|
Age: Pleistocene (0.0117 - 2.588 Ma)
Stratigraphic Name: Beaumont Formation
Comments: On McAllen-Brownsville Sheet (1976) dominantly clay and mud of low permeability. (from Moore and Wermund, 1993a, 1993b): Light- to dark-gray and bluish- to greenish-gray clay and silt, intermixed and interbedded; contains beds and lenses of fine sand, decayed organic matter, and many buried organic-rich, oxidized soil(?) zones that contain calcareous and ferruginous nodules. Very lt. gray to v. lt. yell-gray sediment cemented by calcium carbonate present in varied forms, veins, laminar zones, burrows, root casts, nodules. Locally, small gypsum crystals present. Includes plastic and compressible clay and mud deposited in flood basins, coastal lakes, and former stream channels on a deltaic plain. Disconformably overlies Lissie Fm. Thickness 5-10 m along north edge of outcrop; thickens southward in subsurface to more than 100 m.
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. 
Localities in this Region
- Fort Bend Co.
- Orchard dome (Orchard Dome Oil and Gas field)
- Fort Bend Co.