Table T2

Table T2. Lithostratigraphic summary, Site 1171.

Lithostratigraphic unit and subunit	Series	Core intervals	Lithology	Depth (mbsf)	Comments
IA	Holocene to lower Pliocene	1171A-1H to 5H;1171B-1H to 5H;1171C-1H to 5H	Foraminifer-bearing nannofossil ooze to diatom-bearing nannofossil ooze and nannofossil ooze	0-41.0	Contains a high foraminiferal content (up to 50%).
IB	lower Pliocene to lowermost Miocene	1171A-6H to 14X;1171B-6H to 12H;1171C-6H to 25X	Foraminifer-bearing nannofossil chalk to diatom-bearing nannofossil chalk and foraminifer-bearing clay nannofossil chalk	41.0-124.4 41.0-108.8 41.0-233.7	Rare to occasional detrital silt-size glauconite caused by bottom current action.
II	Oligocene	1171C-28X to 30X;1171D-2R to 3R	Foraminifer-bearing nannofossil chalk to foraminiferal nannofossil chalk	253.4-272.8 257.0-269.8	Downsection increase in glauconite, clay, accessory minerals, quartz, radiolarians, bioclasts, sponge spicules, and volcanic glass and a decrease in biogenic carbonates. Dramatic lithologic contact at base.
III	uppermost Eocene	1171C-30X to 31X1171D-3R	Glauconitic sandy silt to clayey glauconitic siltstone	272.8-274.8 269.8-276.2	Thin, highly bioturbated glauconitic unit below major lithologic transition.
IV	upper Eocene	1171D-4R to 11R	Diatom-bearing claystone, diatom and nannofossil-bearing claystone, diatomaceous claystone	276.2-343.5	Alternating lithified and unlithified strata, limited recovery.
VA	upper to middle Eocene	1171D-11R to 20R	Claystone, nannofossil-bearing claystone	343.50-421.50	Alternating darker and lighter strata at the decimeter to meter scale. Lighter colored intervals contain higher nannofossil and lower organic material percentages than darker intervals. There is a prominent surface at the base of this subunit.
VB	middle Eocene	1171D-20R to 26R	Claystone to occasional organic-bearing claystone	421.50-485.70	Higher organic and lower nannofossil percentages in the upper and lower intervals with slightly elevated nannofossil contents and lower organic matter content within the middle section.
VC	middle Eocene	1171D-26R to 48R	Claystone, silty claystone, to nannofossil claystone	485.70-692.49	Overall increase in lightness and nannofossil percentages from the unit above. High-frequency oscillations in the lighter and darker strata at the decimeter to meter scale for most of this subunit.
VIA	lower Eocene	1171D-48R to 59R	Claystone, silty claystone, nannofossil-bearing silty claystone	692.49-805.1	An overall decrease in nannofossil abundance (to <1%) is accompanied by a rise in quartz silt from the unit above.
VIB	lower Eocene to upper Paleocene	1171D-59R to 75R	Organic matter-bearing silty claystone, silty claystone, organic matter-bearing clayey siltstone	805.1-958.8	Quartz, organic debris, and opaque minerals increase downsection. Bioturbation diminishes downsection with laminations occurring in the last two cores. No obvious lithologic change across the Paleocene and Eocene boundary.