"Flathill Flint"@en . "FHFL"@en . . "Flathill Flint"@en . . "stable"@en . . . "85.7"^^ . "83.7"^^ . . . . "Stratified bedrock. Occurs onshore. Deposited during the Santonian Age (Cretaceous Period) (85.7-83.7 Ma BP)."@en . .