The expanded Neogene section comprises a continuous middle Miocene–Holocene section incorporating Zones CN4–CN15 and yielding rich nannofossil and diatom assemblages. A number of subzone intervals were not recognized because of missing marker taxa. Sphenolithus and Helicosphaera exhibit particularly sporadic distribution patterns, but this is thought to be due to taxic exclusion or rarity rather than significant missing stratigraphy.
The lower Miocene–Paleocene section is a short (16 m), condensed section incorporating at least three major hiatuses. Intriguingly, the unit appears to incorporate the Paleocene/Eocene boundary and the Eocene/Oligocene boundary carbonate pulse.
The upper Oligocene–lower Miocene section (Zones CP19–CN2) (~1.1 m) is characterized by low-diversity assemblages dominated by D. deflandrei and C. floridanus.
The uppermost Eocene–lower Oligocene section (~5.5 m) includes the C. subdistichus acme Subzone CP16a, which is marked in the core by a prominent switch from dark brown claystones to lighter-colored grayish orange nannofossil ooze. This switch to carbonate accumulation is a significant post-Eocene/Oligocene event that is recognized elsewhere in the Pacific.
The short (~0.75 m) upper Paleocene–lower Eocene section appears to represent a short, continuous stratigraphic fragment that can be correlated with Zones CP8–CP11, based on the ranges of D. multiradiatus, D. diastypus, R. bramlettei, T. orthostylus, and D. lodoensis and the decline and LO of Fasciculithus. The Paleocene/Eocene Thermal Maximum level lies within this interval.