| Llajas Formation | |
| Type: | Geologic formation |
| Age: | Eocene |
| Period: | Eocene |
| Prilithology: | Conglomerate |
| Region: | California |
| Underlies: | Sespe Formation |
| Overlies: | Santa Susana Formation |
| Extent: | Transverse Ranges, Southern California |
The Llajas Formation is a non-marine to marine conglomerate geologic formation in Southern California.
It is found in the Transverse Ranges geologic province, within Los Angeles County and Ventura County. Locations include the Simi Hills, Simi Valley, and Santa Susana Mountains.[1]