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| Carboniferous - Wabash formation; Inglefield formation; Ditney formation; Somerville formation; Millersburg formation (1) |
| Geology -- United States --Maps (1) |
| Geology--Illinois--Maps (1) |
| Geology--Indiana--Maps (1) |
| Neogene - unnamed strata (1) |
| Paleogene - unnamed strata (1) |