. . "Bolsovian Substage is a substage in the British regional Carboniferous stratigraphic scheme. It is the third of four substages of the Westphalian Stage. It is preceded by the Duckmantian Substage and succeeded by the Asturian Substage (Geologic Time Scale 2020, fig. 23.5). Replaces: Westphalian Substage C."@en . "stable"@en . "CC"@en . "310.0"^^ . "314.75"^^ . "Bolsovian Substage"@en . . "Bolsovian Substage"@en .