Table T3. Lithologic units with depth interval, distinguishing characteristics, and main sediment facies, Hole 1183A.

Table T3. Lithologic units with depth interval, distinguishing characteristics, and main sediment facies, Hole 1183A.

Core, section,
interval (cm)

Depth
interval
(mbsf)

Unit/Subunit

Distinguishing
characteristic

Stage/Epoch

Main sediment
facies

Other characteristic features

192-1183A-

2R-1, 0, to 24R-1, 43 328.00-838.63 I Ooze to chalk Oligocene to Miocene Foraminifer nannofossil chalk

2R-1, 0, to 3R-1, 0 328.00-337.60 IA Ooze middle Miocene Foraminifer nannofossil ooze

3R-1, 0, to 14R-CC, 33 337.60-444.83 IB Chalk early and middle Miocene Foraminifer nannofossil chalk Upper limit to significant volcanic ash is located within the 300-m noncored interval.

15R-1, 0, to 24R-1, 43 752.00-838.60 IC Ash beds within chalk Oligocene Nannofossil foraminifer chalk with volcanic ash layers

24R-1, 43, to 39R-4, 15 838.60-986.65 II Limestone Paleocene-Eocene Chert-rich limestone and limestone with zeolitic chalk

24R-1, 43, to 36R-4, 71 838.60-958.26 IIA Chert Eocene Nannofossil foraminifer limestone and chert Low recovery.

36R-4, 71, to 39R-4, 15 958.26-986.65 IIB Zeolite-rich bands Paleocene Foraminifer limestone and zeolitic chalk Chertification is common but minor.

39R-4, 15, to 54-3, 120 986.65-1130.37 III Limestone Aptian-Maastrichtian

39R-4, 15, to 50R-1, 60 986.65-1088.80 IIIA White limestone Campanian-Maastrichtian Nannofossil foraminifer limestone Chertification is common but minor. Color cycles range from white to yellowish in Cores 45R-49R.

50R-1, 60, to 54R-3, 120 1088.80-1130.37 IIIB Mottled gray and pinkish white limestone Aptian-Albian and Santonian-Coniacian Nannofossil limestone Upper 1.7 m is condensed. Cores 53R and 54R contain ferruginous calcareous claystone intervals and vitric tuff interbeds.

54R-3, 120, to base of hole 1130.37-1211.10 Basement Basalt flows with rare beds of ferruginous micrite limestone early Aptian Basalt Limestone interbeds are partially recrystallized and light yellowish brown.

Core, section, interval (cm)	Depth interval (mbsf)	Unit/Subunit	Distinguishing characteristic	Stage/Epoch	Main sediment facies	Other characteristic features
192-1183A-
2R-1, 0, to 24R-1, 43	328.00-838.63	I	Ooze to chalk	Oligocene to Miocene	Foraminifer nannofossil chalk
2R-1, 0, to 3R-1, 0	328.00-337.60	IA	Ooze	middle Miocene	Foraminifer nannofossil ooze
3R-1, 0, to 14R-CC, 33	337.60-444.83	IB	Chalk	early and middle Miocene	Foraminifer nannofossil chalk	Upper limit to significant volcanic ash is located within the 300-m noncored interval.
15R-1, 0, to 24R-1, 43	752.00-838.60	IC	Ash beds within chalk	Oligocene	Nannofossil foraminifer chalk with volcanic ash layers
24R-1, 43, to 39R-4, 15	838.60-986.65	II	Limestone	Paleocene-Eocene	Chert-rich limestone and limestone with zeolitic chalk
24R-1, 43, to 36R-4, 71	838.60-958.26	IIA	Chert	Eocene	Nannofossil foraminifer limestone and chert	Low recovery.
36R-4, 71, to 39R-4, 15	958.26-986.65	IIB	Zeolite-rich bands	Paleocene	Foraminifer limestone and zeolitic chalk	Chertification is common but minor.
39R-4, 15, to 54-3, 120	986.65-1130.37	III	Limestone	Aptian-Maastrichtian
39R-4, 15, to 50R-1, 60	986.65-1088.80	IIIA	White limestone	Campanian-Maastrichtian	Nannofossil foraminifer limestone	Chertification is common but minor. Color cycles range from white to yellowish in Cores 45R-49R.
50R-1, 60, to 54R-3, 120	1088.80-1130.37	IIIB	Mottled gray and pinkish white limestone	Aptian-Albian and Santonian-Coniacian	Nannofossil limestone	Upper 1.7 m is condensed. Cores 53R and 54R contain ferruginous calcareous claystone intervals and vitric tuff interbeds.
54R-3, 120, to base of hole	1130.37-1211.10	Basement	Basalt flows with rare beds of ferruginous micrite limestone	early Aptian	Basalt	Limestone interbeds are partially recrystallized and light yellowish brown.