Table T3. Lithologic units with depth interval, distinguishing characteristics, and main sediment facies, Hole 1186A.

Table T3. Lithologic units with depth interval, distinguishing characteristics, and main sediment facies, Hole 1186A.

Core, section,
interval (cm)

Depth interval
(mbsf)

Unit/Subunit

Distinguishing
characteristic

Stage/Epoch

Main sediment facies

Other characteristics

192-1186A-

2R-1, 0, to 14R-1, 0 697.40-812.70 II Chert Paleocene-Eocene Foraminifer nannofossil limestone, chert, and zeolitic chalk Low recovery. Subunit IIA (limestone and chert) and Subunit IIB (limestone and zeolitic chalk) of Hole 1183A can be distinguished; this subunit contact might be between Cores 192-1186A-9R and 10R.

14R-1, 0, to 30R-1, 45 812.70-968.60 III Limestone Aptian-Maastrichtian Nannofossil chalk and limestone

14R-1, 0, to 26R-3, 10 812.70-930.47 IIIA White to brownish white chalk late Campanian-Maastrichtian Nannofossil chalk Chertification is common but minor. Color alternates from white to brownish white in Core 192-1186A-20R to interval 26R-2 of Campanian age. Foraminifers are not preserved below base of Maastrichtian.

26R-3, 10, to 30R-1, 45 930.47-968.60 IIIB Mottled light gray to dark brown limestone Aptian-Albian Nannofossil limestone Upper 0.5 m is condensed interval of calcareous clay. Basal 7 cm is a ferruginous claystone overlying basalt.

30R-1, 45, to base of hole 968.6-1034.00 IV Basalt flows with rare sediment beds early Aptian Basalt Basalt flows with rare beds and fissure fillings of limestone and volcaniclastic breccia.

Core, section, interval (cm)	Depth interval (mbsf)	Unit/Subunit	Distinguishing characteristic	Stage/Epoch	Main sediment facies	Other characteristics
192-1186A-
2R-1, 0, to 14R-1, 0	697.40-812.70	II	Chert	Paleocene-Eocene	Foraminifer nannofossil limestone, chert, and zeolitic chalk	Low recovery. Subunit IIA (limestone and chert) and Subunit IIB (limestone and zeolitic chalk) of Hole 1183A can be distinguished; this subunit contact might be between Cores 192-1186A-9R and 10R.
14R-1, 0, to 30R-1, 45	812.70-968.60	III	Limestone	Aptian-Maastrichtian	Nannofossil chalk and limestone
14R-1, 0, to 26R-3, 10	812.70-930.47	IIIA	White to brownish white chalk	late Campanian-Maastrichtian	Nannofossil chalk	Chertification is common but minor. Color alternates from white to brownish white in Core 192-1186A-20R to interval 26R-2 of Campanian age. Foraminifers are not preserved below base of Maastrichtian.
26R-3, 10, to 30R-1, 45	930.47-968.60	IIIB	Mottled light gray to dark brown limestone	Aptian-Albian	Nannofossil limestone	Upper 0.5 m is condensed interval of calcareous clay. Basal 7 cm is a ferruginous claystone overlying basalt.
30R-1, 45, to base of hole	968.6-1034.00	IV	Basalt flows with rare sediment beds	early Aptian	Basalt	Basalt flows with rare beds and fissure fillings of limestone and volcaniclastic breccia.