Table T2. Summary of radiolarian zonal boundary ages calibrated using the paleomagnetic reversals, Hole 1220A. (See table notes. Continued on next two pages.)

Table T2. Summary of radiolarian zonal boundary ages calibrated using the paleomagnetic reversals, Hole 1220A.


Core, section, interval (cm)	Depth		Preservation	Abundance	Zone	Anthocyrtidium angulare	Artophormis gracilis	Calocyclas bandyca	Calocyclas hispida	Calocyclas turris	Calocycletta robusta	Centrobotrys gravida	Cryptocarpium azyx	Dictyoprora mongolfieri	Didymocyrtis penultima	Didymocyrtis tetrathalamus	Dorcadospyris ateuchus	Dorcadospyris circulus	Dorcadospyris forcipata	Dorcadospyris papilio	Dorcadospyris pseudopapilio	Dorcadospyris quadripes	Dorcadospyris spinosa	Eucyrtidium diaphanes	Eusyringium fistuligerum	Eusyringium lagena	Lamprocyrtis daniellae	Lamprocyrtis heteroporos	Lamprocyrtis neoheteroporos	Lamprocyrtis nigriniae	Lithochytris vespertilio	Lithocyclia aristotelis	Lithocyclia crux	Lithocyclia ocellus gp.	Lophocyrtis jacchia	Lychnocanoma bellum	Lychnocanoma elongata	Lychnodictyum audax	Phormocyrtis striata striata	Phormostichoartus doliolum	Phormostichoartus fistula	Podocyrtis (Lampterium) chalara	Podocyrtis (Lampterium) goetheana	Podocyrtis (Lampterium) mitra	Podocyrtis (Lampterium) trachodes
Core, section, interval (cm)	(mbsf)	(mcd)	Preservation	Abundance	Zone	Anthocyrtidium angulare	Artophormis gracilis	Calocyclas bandyca	Calocyclas hispida	Calocyclas turris	Calocycletta robusta	Centrobotrys gravida	Cryptocarpium azyx	Dictyoprora mongolfieri	Didymocyrtis penultima	Didymocyrtis tetrathalamus	Dorcadospyris ateuchus	Dorcadospyris circulus	Dorcadospyris forcipata	Dorcadospyris papilio	Dorcadospyris pseudopapilio	Dorcadospyris quadripes	Dorcadospyris spinosa	Eucyrtidium diaphanes	Eusyringium fistuligerum	Eusyringium lagena	Lamprocyrtis daniellae	Lamprocyrtis heteroporos	Lamprocyrtis neoheteroporos	Lamprocyrtis nigriniae	Lithochytris vespertilio	Lithocyclia aristotelis	Lithocyclia crux	Lithocyclia ocellus gp.	Lophocyrtis jacchia	Lychnocanoma bellum	Lychnocanoma elongata	Lychnodictyum audax	Phormocyrtis striata striata	Phormostichoartus doliolum	Phormostichoartus fistula	Podocyrtis (Lampterium) chalara	Podocyrtis (Lampterium) goetheana	Podocyrtis (Lampterium) mitra	Podocyrtis (Lampterium) trachodes
199-1222A-
1H-CC	5.37	5.37	M	F	?				(P)				(P)	(P)								(P)			(P)	(P)						(P)		(P)					(P)			(P)	(P)	(P)	(P)
2H-CC	15.30	14.74	M	F	?			(P)	(P)	(P)			(P)																					(P)								(P)	(P)
3H-2, 14-16	16.54	18.42			RN12	+																							P	P
3H-2, 110-112	17.50	19.38			RN10																						P	P												P
3H-3, 42-44	18.32	20.20			RN10																								P
3H-4, 18-20	19.58	21.46	G	C	RN10?	+									P	P													?									P			P
3H-4, 88-90	20.28	22.16	M	C	RN9										P
3H-CC	24.78	26.66	P	R	?
4H-CC	34.40	37.84		T	?
5H-3, 45-47	37.35	42.23
5H-4, 45-47	38.85	43.73		B	?
5H-5, 45-47	40.35	45.23
5H-6, 45-47	41.85	46.73		F/C	RP22						P						P		P	P																	P
5H-7, 45-47	43.35	48.23		P/M
5H-CC	43.90	48.78	M	C	RP21				(P)		P			(P)			P	—	P	P					(P)												—
6H-1, 45-47	43.85	49.19
6H-2, 45-47	45.35	50.69
6H-3, 45-47	46.85	52.19
6H-4, 45-47	48.35	53.69
6H-5, 45-47	49.85	55.19
6H-6, 45-47	51.35	56.69
6H-CC	53.45	58.79		T	?												+
7H-2, 45-47	54.85	64.58	P	R
7H-3, 45-47	56.35	66.08	P	R	?
7H-4, 45-47	57.85	67.58	M/P	C	RP20																	P	P		(P)
7H-5, 45-47	59.35	69.08	M	C	RP20		P	P	P	P		P	(P)	P							P	P			P	(P)						P		P									P		(P)
7H-6, 45-47	60.85	70.58	P	R	RP18?		P							P											P						P			P	P				P				P
7H-7, 66-68	62.56	72.29	G	A	RP15				P					P											P						P			P								P		P
7H-CC	62.72	72.45			RP15				P																P						P			P								P		+
8H-2, 45-47	64.35	74.08	P	R	RP15									P																												P
8H-3, 45-47	65.85	75.58	P	R	RP15																																					P
8H-CC	71.08	80.81		T	?
10X-CC	81.50	81.50		B
12X-CC	97.70	97.70


Core, section, interval (cm)	Depth		Preservation	Abundance	Zone	Podocyrtis (Podocyrtis) papalis	Podocyrtis (Podocyrtoges) ampla	Pterocanium prismatium	Sethochytris triconiscus	Spongaster pentas	Spongaster tetras tetras	Spongatractus pachystylus	Stichocorys peregrina	Theocorythium trachelium trachelium	Theocorythium vetulum	Theocorys anaclasta	Theocotyle venezuelensis	Theocotylissa ficus	Theocyrtis annosa	Theocyrtis tuberosa	Thyrsocyrtis (Pentalacorys) lochites	Thyrsocyrtis (Pentalacorys) tetracantha	Thyrsocyrtis (Pentalacorys) triacantha	Thyrsocyrtis (Thyrsocyrtis) bromia	Thyrsocyrtis (Thyrsocyrtis) rhizodon	Thyrsocyrtis (Thyrsocyrtis) robusta	Tristylospyris triceros
Core, section, interval (cm)	(mbsf)	(mcd)	Preservation	Abundance	Zone	Podocyrtis (Podocyrtis) papalis	Podocyrtis (Podocyrtoges) ampla	Pterocanium prismatium	Sethochytris triconiscus	Spongaster pentas	Spongaster tetras tetras	Spongatractus pachystylus	Stichocorys peregrina	Theocorythium trachelium trachelium	Theocorythium vetulum	Theocorys anaclasta	Theocotyle venezuelensis	Theocotylissa ficus	Theocyrtis annosa	Theocyrtis tuberosa	Thyrsocyrtis (Pentalacorys) lochites	Thyrsocyrtis (Pentalacorys) tetracantha	Thyrsocyrtis (Pentalacorys) triacantha	Thyrsocyrtis (Thyrsocyrtis) bromia	Thyrsocyrtis (Thyrsocyrtis) rhizodon	Thyrsocyrtis (Thyrsocyrtis) robusta	Tristylospyris triceros
199-1222A-
1H-CC	5.37	5.37	M	F	?									P		(P)							(P)		(P)	(P)
2H-CC	15.30	14.74	M	F	?		(P)		(P)			(P)								(P)	(P)		(P)
3H-2, 14-16	16.54	18.42			RN12			P			?		P
3H-2, 110-112	17.50	19.38			RN10			P					P		P
3H-3, 42-44	18.32	20.20			RN10			P		P			P		P
3H-4, 18-20	19.58	21.46	G	C	RN10?			P					P		P
3H-4, 88-90	20.28	22.16	M	C	RN9								P		P
3H-CC	24.78	26.66	P	R	?
4H-CC	34.40	37.84		T	?
5H-3, 45-47	37.35	42.23
5H-4, 45-47	38.85	43.73		B	?
5H-5, 45-47	40.35	45.23
5H-6, 45-47	41.85	46.73		F/C	RP22
5H-7, 45-47	43.35	48.23		P/M
5H-CC	43.90	48.78	M	C	RP21	(P)						(P)							P			(P)	(P)
6H-1, 45-47	43.85	49.19
6H-2, 45-47	45.35	50.69
6H-3, 45-47	46.85	52.19
6H-4, 45-47	48.35	53.69
6H-5, 45-47	49.85	55.19
6H-6, 45-47	51.35	56.69
6H-CC	53.45	58.79		T	?																		(P)
7H-2, 45-47	54.85	64.58	P	R																			P				P
7H-3, 45-47	56.35	66.08	P	R	?
7H-4, 45-47	57.85	67.58	M/P	C	RP20															P							(P)
7H-5, 45-47	59.35	69.08	M	C	RP20		(P)					P					(P)			P			P	P	P		P
7H-6, 45-47	60.85	70.58	P	R	RP18?																	P	P		P		P
7H-7, 66-68	62.56	72.29	G	A	RP15	P			P			P											P				P
7H-CC	62.72	72.45			RP15	P			P			P										P	P		P		P
8H-2, 45-47	64.35	74.08	P	R	RP15																		P		P
8H-3, 45-47	65.85	75.58	P	R	RP15																		P
8H-CC	71.08	80.81		T	?
10X-CC	81.50	81.50		B
12X-CC	97.70	97.70

Notes: Preservation: G = good, M = moderate, P = poor. Abundance: A = abundant, C = common, F = few, R = rare, T = trace, P = present, (P) = present, reworked, + = very rare, — = absent. Magnetostratigraphically-derived ages for the boundaries between Zones RN12 and RN11, between RN11 and RN10, and between RN10 and RN9 are already well established (Shackleton et al., 1995), and the magnetics at Site 1222 do not suggest any changes to those ages. An age of 24.6 Ma was determined by Sanfilippo and Nigrini (1996) for the RP21/RP20 zonal boundary and is not changed herein. Subsequent assumed downhole ages for zonal boundaries are approximations (Sanfilippo and Nigrini, 1998). The ages calculated from the geomagnetic reversals in Site 1220 are generally somewhat older than the Sanfilippo and Nigrini (1998) ages.