SEDIS - Thesaurus
Spergen Formation  | |
|---|---|
| BT | Chronostratigraphic Units |
| .Phanerozoic | |
| ..Paleozoic | |
| ...Carboniferous | |
| ....Mississippian | |
| .....Upper Mississippian | |
| ......Meramecian | |
| .......Spergen Formation | |
| RT | Iowa |
| Kentucky | |
| Missouri | |
| Illinois | |
| Indiana | |
| SN | S Indiana, Illinois, E Iowa, W Kentucky and E Missouri. Added to Thesaurus in 1985. |
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