"Ham-Scarfskerry Flagstone Subgroup [Obsolete: use HSK]"@en . "Calcareous siltstone."@en . . . . "Calcareous siltstone. Stratified bedrock. Occurs onshore. Deposited during the Mid Devonian Epoch (Devonian Period) (394.3-378.9 Ma BP)."@en . "stable"@en . "394.3"^^ . "Ham-Scarfskerry Flagstone Formation"@en . . . "HSK"@en . "378.9"^^ . . . . . "Ham-Scarfskerry Flagstone Formation"@en .