Griffith & Brydone (1911); Brydone (1912) - Zone of Plocoscyphia labrosa and Stauronema carteri

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Biostratigraphical correlation: Inferred to equate with all or part of the N. carcitanense Zone of current usage.

Lithostratigraphical correlation: Equates with the basal part of the West Melbury Marly Chalk Formation in southern England.

Age: Earliest Cenomanian.