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Silurian

Silurian
State Illinois
Name Silurian
Geologic age Silurian
Comments The Silurian consists of the following formations: Moccasin Springs Limestone, St. Clair Limestone, Sexton Creek Limestone, and Edgewood Limestone, Racine Dolomite, Waukesha Dolomite, Joliet Dolomite, Kankakee Dolomite, Edgewood Dolomite. The dolomite units occur in the northern part of the state and the limestone units occur in the southern part of the state. Based on the stratigraphic column on the 1967 paper map, the Silurian is about 50% limestone and 50% dolomite.
Primary rock type dolostone (dolomite)
Secondary rock type limestone
Other rock types coral
Lithologic constituents
Major
Sedimentary > Carbonate > DolostoneThe Silurian consists of the following formations: Moccasin Springs Limestone, St. Clair Limestone, Sexton Creek, Limestone, and Edgewood Limestone, Racine Dolomite, Waukesha Dolomite, Joliet Dolomite, Kankakee Dolomite, Edgewood Dolomite. The dolomite units occur in the northern part of the state and the limestone units occur in the southern part of the state. Based on the stratigraphic column on the 1967 paper map, the Silurian is about 50% limestone and 50% dolomite.
Sedimentary > Carbonate > LimestoneThe Silurian consists of the following formations: Moccasin Springs Limestone, St. Clair Limestone, Sexton Creek, Limestone, and Edgewood Limestone, Racine Dolomite, Waukesha Dolomite, Joliet Dolomite, Kankakee Dolomite, Edgewood Dolomite. The dolomite units occur in the northern part of the state and the limestone units occur in the southern part of the state. Based on the stratigraphic column on the 1967 paper map, the Silurian is about 50% limestone and 50% dolomite.
Map references
Willman, H.B., and others, (compilers), 1967, Geologic Map of Illinois: Illinois State Geological Survey, scale= 1:500,000, paper.
Unit references
Willman, H.B., and others, (compilers), 1967, Geologic Map of Illinois: Illinois State Geological Survey, scale= 1:500,000, paper.
Counties Alexander - Boone - Bureau - Calhoun - Carroll - Champaign - Cook - DeKalb - Douglas - DuPage - Ford - Henry - Iroquois - Jersey - Jo Daviess - Kane - Kankakee - Lake - Lee - Livingston - McHenry - Ogle - Pike - Rock Island - Scott - Stephenson - Union - Whiteside - Will