Figure 4.20. (a) Number of Cenozoic DSDP and ODP sections per 0.5 m.y. in the Neptune database. (b) Number of hiati recorded in the Neptune database during the last 65 m.y. (c) Curve of the frequency of hiati. The vertical line represents the average frequency (30%). Shaded intervals mark periods characterised by a higher than average frequency of hiati (hiatus events). (d) "Eustatic" sea level curve of Haq et al. (1987). (e) Benthic foraminifera oxygen isotope curve (Miller et al. 1987). All curves are calibrated to Berggren et al.ís (1995b) biochronology (from Spencer-Cervato 1998).