Long Point dome, Rosenberg, Fort Bend Co., Texas, USA
|Latitude & Longitude (WGS84):||29° 28' 30'' North , 95° 43' 15'' West|
|Latitude & Longitude (decimal):||29.47525,-95.72105|
|Köppen climate type:||Cfa : Humid subtropical climate|
A S-salt deposit located 12.4 km (7.7 miles) SE of Rosenberg, on private land (private lease). Discovered in 1924. First production occurred in 1930. MRDS database stated accuracy for this location is 100 meters.
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 ore body has a depth-to-top of 518 meters. Ore body No. 1 is sedimentary & tabular. Ore body No. 2 is disseminated, lenticular. The primary mode of origin was evaporation and the secondary mode was sedimentation. Primary ore control was lithology. The average thickness of unconsolidated material is 167 meters. Sulfur occurs in evaporites and limestone on the top and flanks of a salt dome. The sulfur was probably formed by hydrocarbon reduction of anhydrite, assisted by bacterial actions. Local rocks include Beaumont Formation, areas predominantly sand.
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9 valid minerals.
Rock Types Recorded
Rock list contains entries from the region specified including sub-localities
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Entries shown in red are rocks recorded for this region.
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.
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0.0117 - 2.588 Ma
|Beaumont Formation, areas predominantly sand|
Age: Pleistocene (0.0117 - 2.588 Ma)
Stratigraphic Name: Beaumont Formation
Comments: (from Moore and Wermund, 1993a, 1993b) Yellowish- to brownish-gray, locally reddish orange, v. fine to fine quartz sand, silt, and minor fine gravel, intermixed and interbedded. Includes stream channel, point-bar, cravasse-splay, and natural levee ridge deposits, and clayey fill in abandoned channels. Forms poorly defined meander-belt ridges and pimple mounds aligned approx. normal to coast and 1-2 m higher than surround interdistributary silt and clay. Channel fill is dk-brn to brnish-dark-gray, laminated clay and silt, organic -rich. Includes marine delta-front sand, lagoonal clay, and near-shore marine sand beneath and landward of bays along the coast. Interfingers with the interdistributary facies of Beuamont Fm. and rests disconformably on Lissie Fm. Thickness 3-10 m on outcrop; thickens in southeastward 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.
- Long Point dome
- Fort Bend Co.