This report is a survey of the micropaleontology and stratigraphy of Upper Cretaceous rocks in the Ponce-Coamo area. Planktonic Foraminifera and radiolaria are utilized for the zonation of these rocks. Upper Cretaceous planktonics useful in zonation are illustrated. One new species of Praeglobotruncana and 2 new subspecies are described and illustrated.

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