Figure F5. Calcareous nannofossil, planktonic foraminifer, and radiolarian zonations used during Leg 207. References are cited in the text for each microfossil group. T = LO datum or "Top," B = FO datum or "Base," TA = Top acme, X = crossover in relative abundance of two species. An arrow between radiolarian species names indicates an evolutionary transition from the species on the left to the species on the right. Gray bands and dashed lines = zonal boundaries are not clearly delimited in a given zonation. SCWL = Shackleton et al. (1999) alternative dating of events surrounding the Miocene/Oligocene boundary.