Pridoli epoch - Helderbergian 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 | ||||
| Silurian | Pridoli | 419.2 | |||
| Ludlow | Ludfordian | 423 | |||
| Gorstian | 425.6 | ||||
| Wenlock | Homerian | 427.4 | |||
| Sheinwoodian | 430.5 | ||||
| Llandovery | Telychian | 433.4 | |||
| Aeronian | 438.5 | ||||
| Rhuddanian | 440.8 | ||||
| 443.8 | |||||