| Nant Ffrancon Formation | |
|---|---|
| Stratigraphic range: Ordovician | |
| Type | Formation |
| Location | |
| Coordinates | 53°13′45″N4°05′02″W / 53.2292°N 4.0839°W |
| Region | Wales |
| Country | United Kingdom |
The Nant Ffrancon Fermation is a geologic formation in Wales. It preserves fossils dating back to the Ordovician period.