"stable"@en . . . "85.7"^^ . . "Hope Gap Flints"@en . "Hope Gap Flints"@en . . "89.4"^^ . . . . "HGFL"@en . "Stratified bedrock. Occurs onshore. Deposited during the Coniacian Age (Cretaceous Period) (89.4-85.7 Ma BP)."@en .