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Austin Mine, Cave-in-Rock, Cave-in-Rock Sub-District, Hardin Co., Illinois, USA

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Lock Map
Latitude & Longitude (WGS84): 37° 28' 21'' North , 88° 21' 16'' West
Latitude & Longitude (decimal): 37.47264,-88.35467
GeoHash:G#: dn9jjmwjf
Other regions containing this locality:Illinois-Kentucky Fluorspar District, Illinois/Kentucky, USA
Locality type:Mine
Köppen climate type:Cfa : Humid subtropical climate

Ref.: Rocks & Min.: 24:249. A fluorite mine located near Cave-in-Rock.

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

252.17 - 541 Ma

ID: 3187973
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. [154]

315.2 - 323.2 Ma

ID: 2759138
Caseyville Formation

Age: Pennsylvanian (315.2 - 323.2 Ma)

Stratigraphic Name: Caseyville Formation

Comments: Thickness from stratigraphic columns: Caseyville Fm (0-500’) in southern Illinois (south of 40 degrees north latitude); Caseyville (0-90’) in northern Illinois (north of 40 degrees north latitude). The Caseyville Formation represents the lower part of the Racoon Creek Group. In southern Illinois, the Caseyville Formation includes, from oldest to youngest, the Wayside Sandstone, Battery Rock Sandstone, "Biehl, Buchanan, Jordan, Pottsville, Ridgley", Pounds Sandstone members (and also some unnamed coal beds). [Oil well drillers' terms shown in quotation marks.]

Lithology: Major:{shale,sandstone}, Minor:{coal,limestone}

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

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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