Search SEDIS
| Data sets | Publications | Expeditions | Thesaurus |
John Day Formation  | |
|---|---|
| BT | Chronostratigraphic Units |
| .Phanerozoic | |
| ..Cenozoic | |
| ...Tertiary | |
| ....John Day Formation | |
| RT | lower Miocene |
| upper Oligocene | |
| Oregon | |
| SN | Upper Oligocene and lower Miocene. Tentatively divided into three unnamed members. N central Oregon. Indexed with ages as applicable. |