Lithostratigraphy
Silurian
| Telychian | Cariy formation Vargas Peña formation (Rhuddanian – Telychian) |
| Aeronian | Vargas Peña formation (Rhuddanian – Telychian) |
| Rhuddanian | Vargas Peña formation (Rhuddanian – Telychian) Eusebio Ayala formation (Hirnantian – Rhuddanian) |
Ordovician
| Hirnantian | Eusebio Ayala formation (Hirnantian – Rhuddanian) |