Jukes-Browne & Hill (1903, 1904) - Holaster subglobosus Zone

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Biostratigraphical correlation: Inferred to approximately equate with the A. rhotomagense Zone, A. jukesbrownei Zone, C. guerangeri Zone and M. geslinianum Zone (pars) of current usage.

Lithostratigraphical correlation: Equates with the Zig Zag Chalk Formation and basal Holywell Nodular Chalk Formation of current usage.

Age: Mid and Late Cenomanian.

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