Crystal Mine, Cave-in-Rock, Cave-in-Rock Sub-District, Hardin Co., Illinois, USA
|Latitude & Longitude (WGS84):||37° 28' 0'' North , 88° 9' 60'' West|
|Latitude & Longitude (decimal):||37.46667,-88.16666|
|Other regions containing this locality:||Illinois-Kentucky Fluorspar District, Illinois/Kentucky, USA|
|Köppen climate type:||Cfa : Humid subtropical climate|
Ref.: Rocks & Min.: 24:248-249; 63:223; 64:18. A fluorite mine located near Cave-in-Rock. As of 1952 this mine included No.'s 3, 4, and 6 shafts.
6 valid minerals.
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
330.9 - 346.7 Ma
|St. Louis Limestone|
Age: Mississippian (330.9 - 346.7 Ma)
Stratigraphic Name: St. Louis Limestone
Comments: Thickness from stratigraphic columns: St. Louis Ls (0-500’) in southern Illinois (south of 40 degrees north latitude); St. Louis (0-100’) in northern Illinois (north of 40 degrees north latitude). In southern Illinois, unit includes "Martinsville" in lower part, and "Westfield" in upper part.[Oil well drillers' terms shown in quotation marks.]
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.