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Long Point dome, Rosenberg, Fort Bend Co., Texas, USA

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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.

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

9 valid minerals.

Rock Types Recorded

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

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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

0.0117 - 2.588 Ma

ID: 3011199
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.

Lithology: Major:{sand}, Minor:{fine alluvium}

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, used under Creative Commons Attribution 4.0 License

Localities in this Region


This page contains all mineral locality references listed on This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


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Espenshade, G.H. and Broedel, C.H. (1952), Annotated Bibliography and Index Map of Sulphur and Pyrite Deposits in the United States and Alaska, USGS Information Circular 157, 48pp.
Netzeband, F.F., Early, T.R., Ryan J.P. and Miller, W.C. (1964), Sulphur Resources and Production in Texas, Louisiana, Missouri, Oklahoma, Arkansas, Kansas and Mississippi, and Markets for the Sulphur, U.S. Bureau of mines Information Circular IC 8222, 77pp.
Ellison, Jr. (1971), Sulphur in Texas, Bureau of Economic Geology, Handbook No. 2, January, 1971, 48 pp.
McGowen, J.H. et al. (1976), Environmental Geologic Atlas of the Texas Gulf Coastal Zone - Bay City-Freeport Area, University of Texas, Austin, Bureau of Economic Geology, 98 pp., 9 maps.
Linn, Kurt (1987), Assistant to the President, Texas Gulf, Incorporated, telephone conversation with Lee Osmonson (USGS ?).
Rocks & Minerals (1991): 66(3): 196-224.
USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10251722.
U.S. Bureau of Mines, Minerals Availability System (MAS) file ID # 0481570001.
U.S. Bureau of Mines, Microfilm Compilation of Confidential Individual Company Statistics.

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