Jukes-Browne & Hill (1903, 1904) - Rhynchonella cuvieri Zone

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Biostratigraphical correlation: Inferred to equate with the M. geslinianum Zone (pars), N. juddii Zone and Mytiloides spp. Zone of current usage.

Lithostratigraphical correlation: Equates with all but the basal part of the Holywell Nodular Chalk Formation in southern England.

Age: Late Cenomanian & Early Turonian.