Gaster (1924, 1927, 1929, 1932, 1937, 1941, 1944) - abundant O. pilula Horizon
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Biostratigraphical correlation: Equates with all but the highest part of the current Subzone of abundant O. pilula (Young & Lake, 1988).
Lithostratigraphical correlation: Equates with the upper Newhaven Chalk Formation and, locally, also the lower part of the Culver Chalk Formation of southern England.
Age: Campanian