Rowe (1900) - Actinocamax quadratus Zone

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Biostratigraphical correlation: Equates with an interval from near the base of the O. pilula Zone to just below the top of the G. quadrata Zone.

Lithostratigraphical correlation: Equates with the middle and upper parts of the Newhaven Chalk Formation, the Culver Chalk Formation, and probably also the basal part of the Portsdown Chalk Formation of southern England.