| Caimito Formation | |
| Type: | Formation |
| Age: | Late Oligocene-Early Miocene |
| Period: | Aquitanian |
| Prilithology: | Marl |
| Otherlithology: | Siltstone, sandstone, conglomerate |
| Namedfor: | Caimito Junction of Panama Railroad |
| Namedby: | MacDonald |
| Year Ts: | 1913 |
| Region: | Panamá Province |
| Coordinates: | 9.2°N -79.8°W |
| Paleocoordinates: | 7.7°N -77.5°W |
| Underlies: | Alajuela & Gatún Formations |
| Overlies: | Bohío, Caraba & Gatuncillo Formations, Cretaceous basement |
| Extent: | Panama Basin |
The Caimito Formation (Tcm)[1] is a geologic formation in Panama. The marls, sandstones and conglomerates preserve bivalve and gastropod fossils dating back to the Late Oligocene to Early Miocene period.[2] The name Caimito was proposed by MacDonald in 1913, named after the Caimito junction in the Panama Railroad during the construction of the Panama Canal.[3]