Category:Geologic formations in Illinois

• Geologic formations in Illinois by geochronology‎ (11 C)

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• Fossil bearing geologic formations in Illinois‎ (65 C)
• Geologic groups in Illinois‎ (10 C)

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• Scientific articles regarding geologic formations in Illinois‎ (26 C)
• Stratigraphic columns of Illinois‎ (2 F)

A

• Altamont Formation‎ (1 C)
• Alto Formation‎ (1 F)

B

• Bethel Formation‎ (1 C)
• Big Clifty Sandstone‎ (2 C, 5 F)
• Bond Formation (geology)‎ (3 C, 2 F)
• Bonneterre Formation‎ (1 C, 3 F)
• Borden Formation‎ (11 C, 91 F)
• Brainard Formation‎ (1 C)
• Burlington Limestone‎ (3 C, 3 F)

C

• Carbondale Formation‎ (4 C, 3 F)
• Caseyville Formation‎ (2 C, 4 F)
• Chouteau Formation‎ (3 C, 3 F)
• Claiborne Formation‎ (4 C, 6 F)
• Clayton Formation‎ (1 C, 2 F)
• Clore Formation‎ (1 C)

D

• Danville Coal‎ (2 F)
• Decorah Formation‎ (3 C, 6 F)
• Dubuque Formation‎ (1 C, 3 F)
• Dunleith Formation‎ (1 C)

E

• Eau Claire Formation‎ (3 C, 4 F)

F

• Fern Glen Formation‎ (1 C)
• Fernvale Limestone‎ (1 C)
• Fort Atkinson Formation‎ (1 C, 1 F)
• Fort Scott Limestone‎ (1 C)
• Francis Creek Shale‎ (2 C, 4 F)

G

• Galena Dolomite (formation)‎ (1 C, 1 F)
• Glen Dean Formation‎ (4 C, 11 F)
• Glenwood Formation‎ (4 F)
• Grand Detour Formation‎ (1 C)
• Grand Tower Limestone‎ (1 C, 1 F)
• Grassy Creek Shale‎ (1 C, 1 F)
• Guttenberg Formation‎ (1 C)

H

• Hannibal Shale‎ (1 C, 1 F)

I

• Iola Formation‎ (1 C)

K

• Kankakee Formation‎ (2 F)
• Keokuk Formation‎ (3 C)
• Kimmswick Limestone‎ (1 C, 6 F)

L

• Lingle Formation‎ (1 F)
• Little Cedar Formation‎ (2 C, 1 F)

M

• Mattoon Formation‎ (1 C, 2 F)
• Mazon Creek fossil beds‎ (1 C, 36 F)
• Menard Formation‎ (1 C)
• Mifflin Formation‎ (1 F)
• Modesto Formation‎ (1 F)
• Mosalem Formation‎ (1 C)
• Mount Simon Sandstone‎ (3 C, 6 F)

N

• Nachusa Formation‎ (1 C)
• Neda Formation‎ (3 F)
• Niagran Limestone‎ (3 F)

O

• Oneota Formation‎ (3 C, 6 F)
• Owl Creek Formation‎ (2 F)

P

• Paint Creek Formation‎ (1 C)
• Patoka Formation‎ (2 F)
• Pawnee Formation (geology)‎ (1 C)
• Platteville Limestone‎ (2 C, 6 F)
• Potosi Dolomite‎ (2 C, 5 F)
• Prosser Formation‎ (1 C)

R

• Racine Formation (geology)‎ (3 C, 2 F)
• Riverton Coal Formation‎ (1 C)

S

• Salem Limestone‎ (3 C, 4 F)
• Saverton Shale‎ (1 F)
• Shakopee Formation‎ (2 C, 2 F)
• Shelburn Formation‎ (3 C, 2 F)
• St. Clair Limestone‎ (1 C, 2 F)
• St. Louis Limestone‎ (6 C, 8 F)
• St. Peter Sandstone‎ (11 C, 13 F)
• St. Peter Sandstone in Illinois‎ (1 F)
• Ste. Genevieve Limestone‎ (9 C, 19 F)
• Sweetland Creek Shale‎ (1 F)
• Sylamore Sandstone‎ (1 C, 1 F)

T

• Tradewater Formation‎ (4 C, 2 F)

W

• Warsaw Formation‎ (1 C, 1 F)
• Wilcox Formation‎ (1 C, 2 F)
• Wilhelmi Formation‎ (1 C)