"318.0"^^ . . "Mudstone. Stratified bedrock. Occurs onshore. Deposited during the Langsettian Substage (Carboniferous Period) (319-318 Ma BP)."@en . "Hopkins Shell Bed"@en . . . . "319.0"^^ . "HPSB"@en . "Mudstone."@en . . . "stable"@en . "Hopkins Shell Bed"@en . . .