Bouldnor Formation
| Bouldnor Formation | |
|---|---|
| Stratigraphic range: Priabonian-Rupelian ~ | |
| Type | Geological formation | 
| Unit of | Solent Group | 
| Sub-units | Bembridge Marls Member, Hamstead Member, Cranmore Member | 
| Underlies | Alluvium | 
| Overlies | Bembridge Limestone | 
| Thickness | >50 m (160 ft) | 
| Lithology | |
| Primary | Clay | 
| Location | |
| Region | England | 
| Country | United Kingdom | 
The Bouldnor Formation is a geological formation in the Hampshire Basin of southern England. It is the youngest formation of the Solent Group and was deposited during the uppermost Eocene and lower Oligocene.