| Allt Ddu Formation | |
|---|---|
| Stratigraphic range: Ordovician | |
| Type | Formation |
| Location | |
| Country | Wales |
The Allt Ddu Formation is a geological formation in Wales. It preserves fossils dating back to the Ordovician period.
 | This article about a specific stratigraphic formation in the United Kingdom is a stub. You can help Wikipedia by expanding it. |
 | This article related to the Ordovician period is a stub. You can help Wikipedia by expanding it. |
 | This Wales-related article is a stub. You can help Wikipedia by expanding it. |
