Jukes-Browne & Hill (1903, 1904) - Ostrea lunata Zone

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Biostratigraphical correlation: Equates with the B. lanceolata Zone and B. occidentalis Zone of current usage.

Lithostratigraphical correlation: Equates with the Sidestrand, Trimmingham Sponge Beds, Little Marl Point and Beacon Hill Grey Chalk members in East Anglia, and the Tanderagee, Port Calliagh and Ballycastle Chalk members in Northern Ireland.

Age: Masstrichtian