Griffith & Brydone (1911); Brydone (1912) - Actinocamax plenus Zone

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Biostratigraphical correlation: Equates with the greater part of the M. geslinianum Zone of current usage.

Lithostratigraphical correlation: Equates with the Plenus Marls Member, at the base of the Holywell Nodular Chalk Formation in southern England.

Age: Late Cenomanian