Figure 3. Classification of lower Pliocene and Miocene glasses recovered at Sites 982 and 985 based on total alkali-silica plot (after Le Bas et al., 1986). Fields for Jan Mayen rock series (Imsland, 1984) and for Icelandic rock series (Jakobsson, 1979) are shown for comparison. All analyses were normalized to a volatile-free total of 100%.