Upper Greensand Formation
| Upper Greensand Formation | |
|---|---|
| Stratigraphic range: Albian–Cenomanian | |
Sandstones of the Upper Greensand Formation above Blackgang, Isle of Wight | |
| Type | Geological formation |
| Unit of | Selborne Group |
| Underlies | Chalk Group |
| Overlies | Gault Clay |
| Area | Wessex Basin, Weald Basin |
| Thickness | 0–75 m |
| Lithology | |
| Primary | Sandstone |
| Other | Siltstone |
| Location | |
| Country | England |
The Upper Greensand Formation is a Cretaceous formation of Albian to Cenomanian in age, found within the Wessex Basin and parts of the Weald Basin in southern England. It overlies the Gault Clay and underlies the Chalk Group. It varies in thickness from zero to 75 m. It is predominantly a glauconitic fine-grained sandstone, locally becoming silty. Fragmentary dinosaur remains, such as those assigned to Iuticosaurus, have been recovered from this formation. It has been quarried as a building stone from Roman times, and used in London and the area of its outcrop from Devon to East Sussex.