St Davids age - Merioneth age
| International Chronostratigraphic Timescale | Cambrian of Britain | ||||
|---|---|---|---|---|---|
| Cambrian | Furongian | Stage 10 | Merioneth | Dolgellian/Trempealeauan | 486.85 |
| Festiniogian | 490.2 * | ||||
| Jiangshanian | 491 | ||||
| Maentwrogian | 493.6 * | ||||
| Paibian | 494.2 | ||||
| Miaolingian | Guzhangian | St Davids | 497 | ||
| Drumian | 500.5 | ||||
| Wuliuan | 504.5 | ||||
| Series 2 | Stage 4 | Caerfai | 506.5 | ||
| Stage 3 | 514.5 | ||||
| Terreneuvian | Stage 2 | 521 | |||
| Fortunian | 529 | ||||
| 538.8 | |||||