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| Ysidro Formation | |
|---|---|
| Stratigraphic range: Miocene | |
| Type | Geologic formation |
| Overlies | Bermejo Formation |
| Thickness | 500–1,500 feet (150–460 m) |
| Location | |
| Region | Baja California |
| Country | Mexico |
The Ysidro Formation is a geologic formation in Baja California state, northwestern Mexico.
It preserves fossils dating back to the Miocene epoch of the Neogene period.
