. . "BHEB"@en . "Bottom Hebburn Fell Coal (Northumberland)"@en . . . "Coal. Stratified bedrock. Occurs onshore. Deposited during the Bolsovian Substage (Carboniferous Period) (314.75-310 Ma BP)."@en . "stable"@en . "314.75"^^ . "310.0"^^ . . . . "Coal."@en . "Bottom Hebburn Fell Coal (Northumberland)"@en . .