. "314.75"^^ . "318.0"^^ . . "Coal. Stratified bedrock. Occurs onshore. Deposited during the Duckmantian Substage (Carboniferous Period) (318-314.75 Ma BP)."@en . . . "10FT"@en . "Ten Feet Coal (Ingleton)"@en . "Coal."@en . . "Ten Feet Coal (Ingleton)"@en . . . . "stable"@en .