Cambridge Greensand

Cambridge Greensand
Stratigraphic range: Earliest Cenomanian ~100 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Type	Member
Unit of	West Melbury Marly Chalk Formation
Underlies	Chalk Group
Overlies	Gault Formation
Thickness	0.1–1 m (0.33–3.28 ft)
Lithology
Primary	Glauconitic marl
Other	Phosphorite
Location
Coordinates	52°12′N 0°06′E / 52.2°N 0.1°E / 52.2; 0.1
Approximate paleocoordinates	41°00′N 1°48′E / 41.0°N 1.8°E / 41.0; 1.8
Region	England
Country	UK
Extent	North Hertfordshire and Cambridgeshire
Type section
Named for	Cambridge
Location	Arlesey Brickpit
Cambridge Greensand (England)

The Cambridge Greensand is a geological unit in England whose strata are earliest Cenomanian in age.^[1] It lies above the erosive contact between the Gault Formation and the Chalk Group in the vicinity of Cambridgeshire, and technically forms the lowest member bed of the West Melbury Marly Chalk Formation.^[2] It is a remanié deposit, containing reworked fossils of late Albian age, including those of dinosaurs and pterosaurs.