Twenty species of ostracodes are listed and the ranges of Ostracoda, planktonic Foraminifera, and larger Foraminifera in the Antigua Formation and in Puerto Rico and Trinidad are illustrated. The Antigua Formation is considered to contain most of the Globigerina ampliapertura and all of the Globorotalia opima opima biozones. The Oligocene-Miocene boundary is placed at the top of the Globigerina ciperoensis ciperoensis biozone. Correlations of formations in Trinidad, Antigua, and Puerto Rico with biozones and with time-stratigraphic units are illustrated.

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