. "CZ"@en . "Marsdenian Substage is a substage in the British regional Carboniferous stratigraphic scheme. It is the sixth of seven substages of the Namurian Stage. It is preceded by the Kinderscoutian Substage and succeeded by the Yeadonian Substage (Geologic Time Scale 2020, fig. 23.5)."@en . "Marsdenian Substage"@en . "321.5"^^ . "stable"@en . "320.0"^^ . . . "Marsdenian Substage"@en .