| Arimao Formation | |
| Type: | Formation |
| Age: | Santonian ~ |
| Period: | Santonian |
| Prilithology: | Limestone |
| Otherlithology: | Volcaniclastics |
| Namedfor: | Arimao |
| Region: | Cienfuegos Province |
| Coordinates: | 22.2°N -80.5°W |
| Paleocoordinates: | 14.1°N -59.1°W |
| Subunits: | Las Moscas Member |
| Extent: | Escambray Mountains |
The Arimao Formation is a geologic formation in Cuba. It preserves mainly ammonite and rudist fossils dating back to the Santonian period.[1]