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3= Oligocene: Fluvio-marine Series
4= Upper Eocene: Barton, Bracklesham and Bagshot Beds
5= Lower Eocene: London Clay, Lower London Tertiaries
6= Chalk
7= Upper Greensand and Gault (Selbornian)
8= Lower Greensand
9= Wealden: Wealden Clay; Hastings Beds
Reference