Figure 2. Calcareous nannofossil biostratigraphic summary of the Oligocene-Miocene interval of Hole 897C. Indicated are the sub-bottom depths (mbsf), core recovery, lithology, zonal units of Martini (1971), zonal and important bioevents organized by first and last occurrences, and age. The graphic lithology has been compiled by the Leg 149 Shipboard Scientific Party (1994). Graphic symbols depict intervals exceeding 20 cm in thickness. For comparison, similar symbols are used in the Initial Reports volume (Sawyer, Whitmarsh, Klaus, et al., 1994).