Search SEDIS
| Data sets | Publications | Expeditions | Thesaurus |
Petersburg Formation  | |
|---|---|
| BT | Chronostratigraphic Units |
| .Phanerozoic | |
| ..Paleozoic | |
| ...Carboniferous | |
| ....Pennsylvanian | |
| .....Middle Pennsylvanian | |
| ......Petersburg Formation | |
| RT | Indiana |
| SN | SW Indiana. Added to Thesaurus in 1985. |