"GSC"@en . . . "Great Seam Coal (Lothian)"@en . . "Coal. Stratified bedrock. Occurs onshore. Deposited during the Pendleian Substage (Carboniferous Period) (330.3-327 Ma BP)."@en . "327.0"^^ . "stable"@en . . . . "330.3"^^ . "Coal."@en . . "Great Seam Coal (Lothian)"@en . .