"Gorestown Mudstone Member"@en . . "337.0"^^ . . . . . . "GMM"@en . "330.9"^^ . "Stratified bedrock. Occurs onshore. Deposited during the Asbian Substage (Carboniferous Period) (337-330.9 Ma BP)."@en . "stable"@en . "Gorestown Mudstone Member"@en . .