Griffith & Brydone (1911); Brydone (1912) - Terebratulina gracilis Zone
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Biostratigraphical correlation: Inferred to be equivalent to the T. lata Zone of current usage.
Lithostratigraphical correlation: Inferred to be equivalent to the New Pit Chalk Formation and basal Lewes Nodular Chalk Formation of southern England.
Age: Turonian