| Pysht Formation | |
|---|---|
| Stratigraphic range: Paleogene | |
 Fossil from the Pysht Formation | |
| Type | Geological formation |
| Location | |
| Region |  Washington (state) |
| Country |  United States |
The Pysht Formation is a geologic formation in Washington (state). It preserves fossils dating back to the Paleogene period.
| Mammals | |||||
|---|---|---|---|---|---|
| Genus | Species | Presence | Material | Notes | Images |
| Pinnarctidion | P. iverseni | A nearly complete skull and limited postcrania (SDSNH 146624). [1] | A pan-pinniped. | ||
| Crustaceans | |||||
|---|---|---|---|---|---|
| Genus | Species | Presence | Material | Notes | Images |
| Upogebia | U. barti | Locality RB 18. [2] | Multiple specimens. [2] | An upogebiid mud shrimp. | |
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