Helderbergian age - Pragian age
| International Chronostratigraphic Timescale | Devonian of Eastern North America | ||||
|---|---|---|---|---|---|
| Devonian | Late Devonian | Famennian | Conewangan/Conneautan/Canadaway | 358.9 | |
| Frasnian | West Fallsian/Sonyean | 372.2 | |||
| Middle Devonian | Givetian | Geneseean/Taghanican/Tioughniogan | Cazenovian | 382.7 | |
| Eifelian | Southwoodian | 387.7 | |||
| Early Devonian | Emsian | Sawkillian/Deer Parkian | Helderbergian | 393.3 | |
| Pragian | 407.6 | ||||
| Lochkovian | 410.8 | ||||
| 419.2 | |||||