Lower Permian  |
|---|
| BT | Chronostratigraphic Units |
| | .Phanerozoic |
| | ..Paleozoic |
| | ...Permian |
| | ....Lower Permian |
| NT | Abo Formation |
| | Artinskian |
| | Asselian |
| | Autunian |
| | Barakar Stage |
| | Cherry Canyon Formation |
| | Leman Sandstone Formation |
| | Leonardian |
| | Opeche Shale |
| | Qixia Formation |
| | Sakmarian |
| | Wichita Group |
| | Wolfcampian |
| RT | Guadalupian |
| | Kungurian |
| | Guandacol Formation |
| | Rotliegendes |
| | San Gregorio Formation |
| | Upper Permian |
| | Middle Permian |
| | Bird Spring Formation |
| | Itarare Subgroup |
| | Laborcita Formation |
| | Oquirrh Formation |
| | Pictou Group |
| | Stockton Formation |
| | Tensleep Sandstone |
| | Tubarao Group |
| | Wild C |