| Brawley Formation | |
| Type: | Geologic formation |
| Period: | Pleistocene |
| Age: | Pleistocene |
| Namedfor: | City of Brawley |
| Region: | Colorado Desert, California |
| Country: | United States |
| Overlies: | Ocotillo Formation |
The Brawley Formation is a geologic formation in the Colorado Desert of Southern California, located in northwestern Imperial County and eastern San Diego County.[1]
Sandstone and mudstone of the Brawley Formation accumulated between ~1.1 and ~0.6–0.5 Ma in a delta on the margin of an arid Pleistocene lake. It is in the San Jacinto Fault Zone area, including in the San Felipe Hills.
It preserves fossils from the Pleistocene Epoch of the Quaternary Period, during the Cenozoic Era.[2]