Lithostratigraphy
Ordovician
| Sandbian | Crow Point formation Crown Point formation (?Sandbian) |
| Darriwilian | Day Point formation Chazy formation |
Cambrian
| Cambrian stage 10 | Gorge formation (Paibian – Cambrian stage 10) |
| Jiangshanian | Gorge formation (Paibian – Cambrian stage 10) |
| Paibian | Gorge formation (Paibian – Cambrian stage 10) |