The Mexia Clay Member at the base of the Wills Point Formation, which forms the upper part of the Midway Group, is stratigraphically equivalent to the Globorotalia uncinata Zone of Bolli (1957) in Trinidad, to the Globigerina inconstans Zone in the North Caucasus, Soviet Union, and, by extension, to the upper (=type) Montian of Belgium. The lower part of the Midway (Kincaid Formation) is of Danian age.

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