| Blue River Group | |
| Type: | Group |
| Age: | Carboniferous |
| Prilithology: | Limestone |
| Otherlithology: | Shale, Sandstone, Gypsum, Chert |
| Namedfor: | The Blue River |
| Subunits: |
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The Blue River Group is a geologic group in Illinois. It preserves fossils dating back to the Carboniferous period.