Dempsey Cogburn Barite deposit (Dempsey Cogburn mining deposit), Sulphur Mountain, Montgomery Co., Arkansas, USA
|Latitude & Longitude (WGS84):||34° 21' 25'' North , 93° 47' 57'' West|
|Latitude & Longitude (decimal):||34.35718,-93.79935|
|Köppen climate type:||Cfa : Humid subtropical climate|
A former baryte occurrence/mine workings on the South side of Sulphur Mountain. Started 1977 and closed 1978.
Ore is replacement of Stanley Shale.
Workings consist of open cuts.
1 valid mineral.
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
252.17 - 541 Ma
|Paleozoic sedimentary rocks|
Age: Paleozoic (252.17 - 541 Ma)
Lithology: Sedimentary rocks
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. 
419.2 - 443.8 Ma
|Missouri Mountain Shale and Baylock Sandstone|
Age: Silurian (419.2 - 443.8 Ma)
Description: The Baylock Sandstone is present only in the Cross, Cossatot, and Trap Mountains. Missouri Mountain Shale is mapped with Polk Creek Shale and Bigfork Chert in the area between Paron, Saline County, and Little Rock.
Comments: Missouri Mtn. Shale-argillitic shale with minor sandstone and conglomerate (250 ft.); Baylock Sandstone-sandstone with minor siltstone and shale (1000 ft.) Approximatly 1250 ft. maximum thickness. Summary- 75% sandstone, 20% shale, 5% other
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.