Figure 12. Schematic diagram of lamina bundles with their enlargements as appearing in thin sections from the Querecual Formation (Bergantin, Hole P3-6, 97-100 cm): (1) recrystallized calcite, (2) calcareous layer, (3) clay-organic matrix, (4) recrystallized foraminifer (Heterohelicidae), (5) clay-organic layer interpreted as a relict of a varval dark lamina, (6) calcitized radiolarians, and (7) calcareous layer interpreted as a relict of a varval light lamina.