Figure F11. Radiolarian zonation used for Leg 178 and the magnetostratigraphy of Berggren et al. (1995). Preceding each event is its age in Ma; events defining zonal boundaries are in bold. T = top occurrence, B = bottom occurrence, ET = evolutionary transition. Numbers in parentheses are the sources of the ages: (1) Lazarus (1990); (2) Caulet (1991); (3) Hayes and Opdyke (1967); (4) Lazarus (1992); (5) Abelmann (1992).