"Unnamed Marine Band of Cancelloceras cumbriense Zone"@en . "stable"@en . . . . "Mudstone. Stratified bedrock. Occurs onshore. Deposited during the Yeadonian Substage (Carboniferous Period) (320-319 Ma BP)."@en . "Mudstone."@en . "320.0"^^ . . . "Unnamed Marine Band of Cancelloceras cumbriense Zone"@en . . . . "319.0"^^ . "G1B"@en .