| Oregon Formation | |
| Type: | Formation |
| Age: | Ordovician |
| Period: | Ordovician |
| Region: | Southeastern United States |
| Country: | United States |
| Underlies: | Tyrone Limestone |
| Overlies: | Camp Nelson Limestone |
| Extent: | Kentucky |
The Oregon Formation is a geologic formation in Kentucky. It dates back to the Ordovician period .