| Claxby Ironstone | |
| Type: | Formation |
| Period: | Early Cretaceous |
| Prilithology: | Clay |
| Otherlithology: | Silt, ironstone |
| Region: | England |
| Country: | United Kingdom |
| Underlies: | Tealby Formation |
| Overlies: | Spilsby Sandstone |
| Thickness: | Up to 8 m |
| Extent: | The Wash, southern Lincolnshire |
The Claxby Ironstone is a geologic formation in England. It preserves fossils dating back to the Cretaceous period.