| Dos Bocas Formation | |
|---|---|
| Stratigraphic range: Chattian (Deseadan) ~ | |
 Montañita-Olón locality with outcrops of the Dos Bocas Formation | |
| Type | Geological formation |
| Unit of | Subibaja Group |
| Underlies | Villingota Formation |
| Overlies | Zapotal Formation |
| Lithology | |
| Primary | Sandstone |
| Location | |
| Coordinates | 1°48′S 80°48′W / 1.8°S 80.8°W |
| Approximate paleocoordinates | 3°36′S 75°30′W / 3.6°S 75.5°W |
| Region | Santa Elena Province |
| Country |  Ecuador |
| Extent | Progreso Basin |
The Dos Bocas Formation is a sedimentary geological formation of the Progreso Basin in southwestern Ecuador. It is dated to the Chattian, about 26 to 24 Ma, (Deseadan in the SALMA classification).