"Gutter Coal (Titterstone Clee)"@en . "Coal. Stratified bedrock. Occurs onshore. Deposited during the Langsettian Substage - to - Bolsovian Substage (Carboniferous Period) (319-310 Ma BP)."@en . . "Gutter Coal (Titterstone Clee)"@en . "Coal."@en . "319.0"^^ . . . "GUTC"@en . . "stable"@en . . . "310.0"^^ .