Lower Greensand Group

Lower Greensand Group
Stratigraphic range: Aptian – Early Albian 125–110 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Lower Greensand outcrop near Dryhill
Type	Stratigraphic group
Sub-units	Wessex Basin: Atherfield Clay Formation, Ferruginous Sands, Sandrock Formation, Monk's Bay Sandstone Formation Weald Basin: Atherfield Clay Formation, Hythe Formation, Sandgate Formation, Folkestone Formation Marginal: Woburn Sands Formation, Faringdon Sand, Seend Ironstone Formation, Calne Sands Formation
Underlies	Selborne Group
Overlies	In Southern England, Wealden Group, elsewhere Jurassic rocks
Thickness	~250 m in South Western Weald
Lithology
Primary	Sandstone
Other	Siltstone, Clay
Location
Region	England
Country	UK

The Lower Greensand Group is a geological unit present across large areas of Southern England. It was deposited during the Aptian and Albian stages of the Early Cretaceous. It predominantly consists of sandstone and unconsolidated sand that were deposited in shallow marine conditions.