Tremadocian age - Floian age
| International Chronostratigraphic Timescale | |||
|---|---|---|---|
| Ordovician | Late Ordovician | Hirnantian | 443.1 |
| Katian | 445.2 | ||
| Sandbian | 452.8 | ||
| Middle Ordovician | Darriwilian | 458.2 | |
| Dapingian | 469.4 | ||
| Early Ordovician | Floian | 471.3 | |
| Tremadocian | 477.1 | ||
| 486.85 | |||