"Courceyan Substage is a substage in the British regional Carboniferous stratigraphic scheme. It is the only substage of the Tournaisian Stage. It is succeeded by the Chadian Substage (Visean Stage) (BGS Research Report RR/10/07, table 1)."@en . "CF"@en . . "Courceyan Substage"@en . "346.7"^^ . "stable"@en . "359.3"^^ . . . "Courceyan Substage"@en .