| Crugan Mudstone | |
|---|---|
| Stratigraphic range: Ordovician | |
| Type | Formation |
| Lithology | |
| Primary | Mudstone |
| Location | |
| Region | England |
| Country |  United Kingdom |
The Crugan Mudstone is a geologic formation in England. It preserves fossils dating back to the Ordovician period.
