Biostratigraphic and chronostratigraphic analyses of planktonic foraminifers presented here were made by the author's shipboard examinations of all core-catcher samples and subsequent onshore examinations of additional samples.
Samples of 10 cm3 (except core-catcher samples) were washed through a 250-mesh screen (0.062 mm) and dried in an oven. Planktonic foraminifers >0.125 mm were selected from the washed residue, and the frequency of occurrence of each species was calculated.
The biostratigraphic zonation of planktonic foraminifers is that of Blow (1969), and chronologic calibrations of Blow's zones are based on those given by Berggren et al. (1995).