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Rattlesnake Butte, Jackson Co., South Dakota, USA

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Latitude & Longitude (WGS84): 43° 25' 50'' North , 101° 55' 46'' West
Latitude & Longitude (decimal): 43.43068,-101.92948
Köppen climate type:Dwa : Monsoon-influenced hot-summer humid continental climate


The site is a National Natural Landmark (NNL) and is closed to collecting. It is jointly managed by the National Parks Service and the Ogalla Sioux. Sometimes listed under old county name of Washabaugh.

Note: Washington Co. merged into Jackson Co. 1943.
Washabaugh Co. merged into Jackson Co. in 1983.
Rattlesnake Butte previously appears to have been called Devil’s Hill and Snake Butte.

Mineral List


1 valid mineral.

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

Miocene - Oligocene
5.333 - 33.9 Ma



ID: 2944067
Arikaree Group

Age: Cenozoic (5.333 - 33.9 Ma)

Stratigraphic Name: Rosebud Formation; Harrison Formation; Turtle Butte Formation; Monroe Creek Formation; Sharps Formation

Description: Includes: Rosebud Formation (Miocene)- Pink siltstone with channel sandstone and concretions. Thickness up to 250 ft (76 m). Harrison Formation (Miocene)- Gray, silty sandstone and reworked volcanic ash with calcareous siltstone and marl. Thickness 180 ft (55 m). Turtle Butte Formation (Miocene)- Light-green to gray siltstone with sandstone channels containing claystone pebbles. Thickness 65 ft (20 m). Monroe Creek Formation (Oligocene)- Tan to grayish-tan, massive sandy siltstone and reworked volcanic ash. Thickness 100 ft (30 m). Sharps Formation (Oligocene)- Pink siltstone and claystone with concretionary layers, paleochannels, and beds of reworked volcanic ash. Thickness 360 ft (110 m).

Lithology: Major:{siltstone,sandstone}, Minor:{claystone,felsic volcanic,marlstone}

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



This page contains all mineral locality references listed on mindat.org. 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 mindat.org 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.

References

Wanless, H.R. (1922) Notes on sand calcite from South Dakota. American Mineralogist: 7: 83-86.

U.S. Geological Survey (1976) Administrative Report BIA-12.

External Links


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