Griffith & Brydone (1911); Brydone (1912) - Zone of Ammonites (Schloenbachia) varians and Rhynchonella martini

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Biostratigraphical correlation: Inferred to equate with the M. mantelli Zone (pars), M. dixoni Zone and C. inerme Zone.

Lithostratigraphical correlation: Inferred to equate with all but the basal part of the West Melbury Marly Chalk Formation in southern England.

Age: Early to Mid Cenomanian

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