Griffith & Brydone (1911); Brydone (1912) - Inoceramus labiatus and Rhynchonella cuvieri Zone
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Biostratigraphical correlation: Inferred to be equivalent to the Mytiloides spp. Zone of current usage.
Lithostratigraphical correlation: Inferred to be equivalent to the greater part of the Holywell Nodular Chalk Formation and basal New Pit Chalk Formation of southern England.
Age: Early Turonian