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Rock River Stone Quarry, Joslin, Rock Island Co., Illinois, USA

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Latitude & Longitude (WGS84): 41° 32' 47'' North , 90° 16' 30'' West
Latitude & Longitude (decimal): 41.54639,-90.27500
Köppen climate type:Dfa : Hot-summer humid continental climate

A quarry located 4.6 km (2.8 miles) WSW of Joslin.

Deposit:: RCF AND CMS LISTS 10/81
Commodities (Major) - Stone - Crushed/Broken
Development Status: Producer

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.

Mineral List

2 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

Pridoli - Llandovery
419.2 - 443.8 Ma

ID: 2856196
Silurian System undivided

Age: Silurian (419.2 - 443.8 Ma)

Stratigraphic Name: Sexton Creek Limestone; St. Clair Limestone; Moccasin Springs Formation; Wilhelmi Formation; Elwood Dolomite; Kankakee Dolomite; Joliet Dolomite; Sugar Run Dolomite; Racine Dolomite; Mosalem; Tete des Morts Dolomite; Blanding Dolomite; Sweeney Dolomite; Marcus Dolomite; Racine Dolomite

Description: Silurian System undivided, includes Sexton Creek Limestone, St. Clair Limestone, and Moccasin Springs Formation in southern Illinois; includes Wilhelmi Formation, Elwood Dolomite, Kankakee Dolomite, Joliet Dolomite, Sugar Run Dolomite, and Racine Dolomite in northeastern Illinois; includes Mosalem, Tete des Morts, Blanding, Sweeney, Marcus, and Racine Dolomites in northwestern Illinois.

Comments: Thickness from stratigraphic columns (listed from oldest to youngest): Bowling Green Dol (0-50'), Sexton Creek Ls (0-125’), St. Clair Ls (0-150’) (of which the seventy-Six Shale Mbr occurs at the base), Moccasin Springs Fm (0-1,000’) in southern Illinois (south of 40 degrees north latitude); Wilhelmi Fm (0-100’), Elwood Dol (0-30’), Kankakee Dol (0-50’), Joliet Dol (0-80’), Sugar Run Dol (0-30’), and Racine Dol (0-300') in northern Illinois (north of 40 degrees north latitude); Mosalem Fm (0-100’), Tete des Morts Dol (0-24’), Blanding Dol (0-50’), Sweeney Dol (0-55’), Marcus Dol (0-45’), and Racine Dol (0-300’) in northwestern Illinois. The Schweizer Mbr occurs at the base of the Wilhelmi Fm and the Birds Mbr at the top; the Kankakee Dolomite is comprised, from oldest to youngest, of the Drummond, Offerman, Troutman, and Plaines Members; and the Joliet Dolomite is comprised, from oldest to youngest, of the Brandon Bridge, Markgraf, and Romeo Members. Unit name in original GIS (Esri shapefile IL_Geologic_Units_500K_2005_Py) is 'Silurian System'; name on Legend of geologic map is 'Silurian System undivided'.

Lithology: Major:{dolostone,limestone}, Minor:{shale}

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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