Figure F2. Zonal Scheme, zonal marker species, and ages used in this study. Zonal scheme from Kennett and Srinivasan (1983); datum ages from Berggren et al. (1995), Curry, Shackleton, Richter, (1995), and Chaisson and Pearson (1997). FO = first occurrence, LO = last occurrence.

Figure F2. Zonal Scheme, zonal marker species, and ages used in this study. Zonal scheme from Kennett and Srinivasan (1983); datum ages from Berggren et al. (1995), Curry, Shackleton, Richter, (1995), and Chaisson and Pearson (1997). FO = first occurrence, LO = last occurrence.