| Otay Formation | |
| Type: | Formation |
| Period: | Miocene |
| Age: | Oligocene-Miocene |
| Region: | California Baja California |
| Country: | |
| Overlies: | Sweetwater Formation |
The Otay Formation is a geologic formation in San Diego County, California (United States) and northern Baja California state (Mexico).[1] [2] It is within the Peninsular Ranges province.[1]
It preserves fossils of the Oligocene to Miocene periods of the Cenozoic Era.[1] Fossils in the Sweetwater Formation that underlies the Otay Formation are of the Late Eocene period.[1]