Figure F4. Summary of planktonic foraminiferal biozonation, Site U1400. Species Globigerinella calida, Globorotalia miocenica, Globorotalia exilis, and Globigerinoides extremus are believed to represent the true age of the deposits. Globorotalia flexuosa may represent a true age, but this is not conclusive, given the few samples in which it is present. Globorotalia tosaensis and Globorotalia cibaoensis are likely reworked from older material. The bottom of G. tosaensis in Hole U1400C is unclear, indicated by the blue question marks. Black question marks denote the unclear relationship below the cored material. Correlations between sites are based on the species present and their age ranges, not lithology.
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