Figure F2. Combined Quaternary zonal schemes of Martini (1971), Gartner (1977), and Okada and Bukry (1980). GPTS = Geomagnetic Polarity Timescale (after Berggren et al., 1995). LO = last occurrence, FO = first occurrence. AZ = acme zone.

Figure F2. Combined Quaternary zonal schemes of Martini (1971), Gartner (1977), and Okada and Bukry (1980). GPTS = Geomagnetic Polarity Timescale (after Berggren et al., 1995). LO = last occurrence, FO = first occurrence. AZ = acme zone.