"stable"@en . . . "Carbonaceous ironstone and ironstone. Stratified bedrock. Occurs onshore. Deposited during the Duckmantian Substage (Carboniferous Period) (318-314.75 Ma BP)."@en . "314.75"^^ . . . . "Craigmark Blackband Ironstone"@en . "CBI"@en . . . "318.0"^^ . . "Carbonaceous ironstone and ironstone."@en . "Craigmark Blackband Ironstone"@en .