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