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Reliance Mine (Iron Duke; Monitor; Annie Creek; Ak-Sar-Ben; University; Bunker Hill), Bald Mountain District, Lawrence Co., South Dakota, USA

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Latitude & Longitude (WGS84): 44° 20' North , 103° 51' West
Latitude & Longitude (decimal): 44.33333,-103.85000
Köppen climate type:Dfb : Warm-summer humid continental climate


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Mineral List


5 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

Eocene - Paleocene
33.9 - 66 Ma



ID: 2473569
Alkali rhyolitic intrusive rocks

Age: Paleogene (33.9 - 66 Ma)

Description: Tan to gray, containing phenocrysts of alkali feldspar and quartz. Forms sills.

Reference: Redden, J.A., E. DeWitt. Maps Showing Geology, Structure, and Geophysics of the Central Black Hills, South Dakota. U.S. Geological Survey Scientific Investigations Map 2777. [73]

Permian - Devonian
252.17 - 419.2 Ma



ID: 3190647
Paleozoic sedimentary rocks

Age: Paleozoic (252.17 - 419.2 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. [154]

Late Ordovician - Middle Cambrian
443.8 - 511 Ma



ID: 2882414
Whitewood Limestone, Winnipeg Formation, and Deadwood Formation

Age: Paleozoic (443.8 - 511 Ma)

Stratigraphic Name: Whitewood Limestone; Winnipeg Formation; Deadwood Formation

Description: Whitewood Limestone (Ordovician)- Mottled, tan, gray to lavender, fine- to medium-crystalline, sparsely fossiliferous limestone and dolomite. Thickness up to 70 ft (21 m). Winnipeg Formation (Ordovician)- Grat and light-green, fissile shale, and tan, calcareous siltstone, sandy shale, and limestone lenses. Thickness up to 110 ft (34 m). Deadwood Formation (Ordovician to Cambrian)- Variegated, yellow to red, brown, gray, and green, glauconitic, conglomerate, sandstone, shale, dolomitic limestone, and dolomite. Thickness 4-400 ft (1-122 m).

Lithology: Major:{conglomerate,sandstone,shale}, Minor:{limestone,dolostone,siltstone}

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



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