Santiago Formation, California
The Santiago Formation is a geologic formation in Orange and northwestern San Diego County, California. The siltstones, mudstones and sandstones of the formation preserve fossils of Walshina esmaraldensis and Diegoaelurus vanvalkenburghae, dating back to the Late Eocene to Late Oligocene periods (Uintan to Duchesnean in the NALMA classification).
| Santiago Formation | |
|---|---|
| Stratigraphic range: Late Eocene-Late Oligocene (Uintan-Duchesnean) | |
| Type | Geological formation |
| Lithology | |
| Primary | Siltstone, mudstone |
| Other | Sandstone |
| Location | |
| Coordinates | 33.1°N 117.3°W |
| Approximate paleocoordinates | 33.3°N 104.1°W |
| Region | Orange & NW San Diego County, California |
| Country | United States |
Santiago Formation, California (the United States) Santiago Formation, California (California) | |
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