"Buckhaven Planolites Bed"@en . "Stratified bedrock. Occurs onshore. Deposited during the Duckmantian Substage - to - Bolsovian Substage (Carboniferous Period) (318-310 Ma BP)."@en . . . "stable"@en . "318.0"^^ . . . "310.0"^^ . "Buckhaven Planolites Bed"@en . . "BUPL"@en . .