Table T2

Table T2. Lithostratigraphic summary, Site 1172.

Lithostratigraphic units and subunits	Series	Core intervals	Lithology	Depth (mbsf)	Comments
IA	Holocene to early Pliocene	1172A-1H to 8H;1172B-1H to 8H;1172C-1H to 8H	Nannofossil foraminifer ooze, foraminifer-bearing nannofossil ooze, and nannofossil ooze	0-70.0	Foraminifers decrease downsection.
IB	early Pliocene to late Miocene	1172A-8H to 30X;1172B-8H to 22H;1172C-8H to 18H	Nannofossil ooze	70.0-271.2
IC	early Miocene to middle Miocene	1172A-30X to 39X;1171D-1R	Foraminifer-bearing nannofossil chalk, nannofossil chalk, clay- and foraminifer- bearing nannofossil chalk, foraminiferal-and clay-bearing nannofossil chalk	271.2-355.8	Increase in clay and foraminifers downsection.
II	Oligocene to latest Eocene	1172A-39X;1171D-2R	Diatom- and clay-bearing nannofossil chalk, silty diatomaceous claystone, spicules- and diatom-bearing clayey siltstone, diatom-bearing silty claystone, and diatomaceous clayey siltstone	355.8-361.1	Transitional unit. Major lithologic changes, very slow sedimentation rates (condensed section).
IIIA	late to middle Eocene	1172A-39X to 47X;1171D-2R to 3R	Diatom- and nannofossil-bearing claystone, diatom-bearing claystone, diatom claystone, and nannofossil-bearing diatom silty claystone	361.1-433.9	Increasing dissolution of calcareous microfossils.
IIIB	middle Eocene	1172A-47X to 54X;1172D-4R	Diatomaceous silty claystone and diatom-bearing silty claystone	433.9-503.4	Nearly total absence of calcareous microfossils.
IVA	middle Eocene to early Paleocene	1172A-54X to 56X;1172D-4R to 24R-5	Claystone, nannofossil-bearing claystone, silty claystone, and organic-bearing silty claystone	503.4-696.0	Significant increase in glauconite just above the K/T boundary.
IVB	Cretaceous (Maastrichtian)	1172D-24R-5 to 31R	Claystone and silty claystone	696.0-766.5	Excellent preservation of calcareous microfossils in upper portion.