Upper Greensand Formation

Upper Greensand Formation
Stratigraphic range: Albian–Cenomanian 113–94 Ma PreꞒ Ꞓ O S D C P T J K Pg N
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.^[1] 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.