Patoka Formation

{{Infobox rockunit

| name = Patoka Formation

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| type = Formation

| age = Pennsylvanian

| period = Pennsylvanian

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| region = Illinois and Indiana

| country = United States

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| unitof = McLeansboro Group

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| underlies = Bond Formation

| overlies = Shelburn Formation

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The Patoka Formation is a geologic formation in Illinois. It preserves fossils dating back to the Carboniferous period.