"Holywell Nodular Chalk Formation, New Pit Chalk Formation, Lewes Nodular Chalk Formation, Seaford Chalk Formation, Newhaven Chalk Formation And Culver Chalk Formation (Undifferentiated)"@en . "HLCCK"@en . . "100.5"^^ . . "Bedrock. Occurs onshore. Formed during the Cenomanian Age - to - Campanian Age (Cretaceous Period) (100.5-72.2 Ma BP)."@en . . . "stable"@en . "72.2"^^ . . . "Holywell Nodular Chalk Formation, New Pit Chalk Formation, Lewes Nodular Chalk Formation, Seaford Chalk Formation, Newhaven Chalk Formation And Culver Chalk Formation (Undifferentiated)"@en .