Table T1. Overview of the fossil, magnetic reversal and additional datums used in developing the age models for the Leg 189 sites.

Age (Ma)	Event	1170 (mbsf)	Age (Ma)	Event	1171 (mbsf)	Age (Ma)	Event	1172 (mbsf)	Age (Ma)	Event	1168 (mbsf)
14.076	MR-Onset C5ACn	283.50	14.076	MR-Onset C5ACn	159.35	14.076	MR-Onset C5ACn	285.20	14.000	NF-FO Triquetrorhabdulus rugosus	244.30
14.178	MR-Termination C5ADn	286.00	14.178	MR-Termination C5ADn	161.30	14.178	MR-Termination C5ADn	287.30	15.100	PF-FO Orbulina suturalis	255.26
14.380	D-FO Actinocyclus ingens var. nodus	291.42	14.612	MR-Onset C5ADn	167.20	14.612	MR-Onset C5ADn	291.90	16.300	PF- FO Praeorbulina curva	264.90
14.612	MR-Onset C5ADn	292.00	19.048	MR-Termination C6n	207.20	14.800	MR-Termination C5Bn.1n	293.30	17.400	NF-FO Calcidiscus premacintyrei	280.35
14.800	MR-Termination C5Bn.1n	294.00	20.131	MR-Onset C6n	223.50	14.888	MR-Onset C5Bn.1n	293.90	18.200	NF-FO Sphenolithus heteromorphus	293.80
14.888	MR-Onset C5Bn.1n	296.00	21.700	1170-benthic ¹³C	240.23	15.034	MR-Termination C5Bn.2n	296.30	18.300	NF-LO Sphenolithus belemnos	299.55
15.034	MR-Termination C5Bn.2n	297.50		Top of gap	247.38	15.155	MR-Onset C5Bn.2n	298.80	19.200	NF-FO Sphenolithus belemnos	313.90
16.014	MR-Termination C5Cn.1n	308.00		Bottom of gap	248.90	16.014	MR-Termination C5Cn.1n	302.30	21.400	PF-LO Tenuitella munda	341.10
16.293	MR-Onset C5Cn.1n	310.50	22.400	1170-benthic ¹⁸O	249.36	16.726	MR-Onset C5Cn.3n	314.10	22.600	PF-FO Globoturborotalita woodi	373.97
16.327	MR-Termination C5Cn.2n	311.00	22.800	1170-bulk ¹³C	251.00	17.277	MR-Termination C5Dn	316.90	23.200	PF-FO Globoquadrina dehiscens	407.64
16.488	MR-Onset C5Cn.2n	312.00	23.150	1170-benthic ¹³C	251.90	18.281	MR-Termination C5En	320.20	23.750	1170-Mi1 peaks	414.00
17.615	MR-Onset C5Dn	323.00		Top of gap	253.84	18.781	MR-Onset C5En	324.00	23.900	1170-Mi1 peaks	420.00
18.781	MR-Onset C5En	338.00		Bottom of gap	258.50	19.048	MR-Termination C6n	325.80	24.730	MR-1-Termination C7n.1n	428.05
19.048	MR-Termination C6n	341.00	23.880	1170-benthic ¹⁸O	258.56	20.131	MR-Onset C6n	333.10	25.183	MR-1-Onset C7n.2n	462.65
21.634	1090 Mi-1a	365.76		Top of gap	264.88	21.790	1170-bulk ¹³C	339.86	25.496	MR-1-Termination C7An	472.00
21.700	1090 Mi-1a	366.59		Bottom of gap	268.10	22.490	1170-benthic ¹³C	342.51	27.027	MR-1-Termination C9n	509.35
21.859	MR-Onset C6AAn	370.50	26.400	1170-bulk ¹³C	268.76	22.810	1170-bulk ¹³C	342.86	27.972	MR-1-Onset C9n	546.20
22.151	MR-Termination C6AAr.1n	372.20	26.900	1170-benthic ¹³C	269.26	23.150	1170-benthic ¹³C	343.26	28.283	MR-1-Termination C10n.1n	572.90
22.459	MR-Termination C6AAr.2n	374.90	30.240	D-FO Rocella vigilans-~top MPC	272.90	23.950	1170-benthic ¹⁸O	344.37	28.512	MR-1-Onset C10n.1n	597.80
22.493	MR-Onset C6AAr.2n	375.40				26.340	1170-bulk ¹³C	347.31	28.578	MR-1-Termination C10n.2n	602.45
22.588	MR-Termination C6Bn.1n	375.80				29.401	MR-Termination C11n.1n	356.10	29.401	MR-1-Termination C11n.1n	706.10
	Top of gap	376.58				29.662	MR-Onset C11n.1n	356.80	29.662	MR-1-Onset C11n.1n	716.70
22.804	MR-Termination C6Bn.2n-bottom of gap	377.40				29.765	MR-Termination C11n.2n	357.30	29.765	MR-1-Termination C11n.2n	718.48
23.535	MR-Onset C6Cn.1n	380.00				30.098	MR-Onset C11n.2n-~top MPC	358.60	30.098	MR-1-Onset C11n.2n	729.90
23.677	MR-Termination C6Cn.2n	382.00							30.479	MR-1-Termination C12n	733.95
23.800	MR-Onset C6Cn.2n	382.90							30.939	MR-1-Onset C12n	740.00
24.118	MR-Onset C6Cn.3n	386.00
24.730	MR-Termination C7n.1n	393.40
24.781	MR-Onset C7n.1n	394.00
25.496	MR-Termination C7An	395.00
25.648	MR-Onset C7An	396.20
25.823	MR-Termination C8n.1n	397.00
26.100	NF-LO Chiasmolithus altus	397.46
26.554	MR-Onset C8n.2n	398.60
27.027	MR-Termination C9n	402.00
27.972	MR-Onset C9n	403.00
28.283	MR-Termination C10n.1n	406.50
29.401	MR-Termination C11n.1n	440.00
30.240	D-FO Rocella vigilans - ~top MPC	458.55

Table T1. Overview of the fossil, magnetic reversal and additional datums used in developing the age models for the Leg 189 sites.

Age
(Ma)

Event

1170
(mbsf)

Age
(Ma)

Event

1171
(mbsf)

Age
(Ma)

Event

1172 (mbsf)

Age
(Ma)

Event

1168
(mbsf)

14.076 MR-Onset C5ACn 283.50 14.076 MR-Onset C5ACn 159.35 14.076 MR-Onset C5ACn 285.20 14.000 NF-FO Triquetrorhabdulus rugosus 244.30

14.178 MR-Termination C5ADn 286.00 14.178 MR-Termination C5ADn 161.30 14.178 MR-Termination C5ADn 287.30 15.100 PF-FO Orbulina suturalis 255.26

14.380 D-FO Actinocyclus ingens var. nodus 291.42 14.612 MR-Onset C5ADn 167.20 14.612 MR-Onset C5ADn 291.90 16.300 PF- FO Praeorbulina curva 264.90

14.612 MR-Onset C5ADn 292.00 19.048 MR-Termination C6n 207.20 14.800 MR-Termination C5Bn.1n 293.30 17.400 NF-FO Calcidiscus premacintyrei 280.35

14.800 MR-Termination C5Bn.1n 294.00 20.131 MR-Onset C6n 223.50 14.888 MR-Onset C5Bn.1n 293.90 18.200 NF-FO Sphenolithus heteromorphus 293.80

14.888 MR-Onset C5Bn.1n 296.00 21.700 1170-benthic ¹³C 240.23 15.034 MR-Termination C5Bn.2n 296.30 18.300 NF-LO Sphenolithus belemnos 299.55

15.034 MR-Termination C5Bn.2n 297.50
Top of gap 247.38 15.155 MR-Onset C5Bn.2n 298.80 19.200 NF-FO Sphenolithus belemnos 313.90

16.014 MR-Termination C5Cn.1n 308.00
Bottom of gap 248.90 16.014 MR-Termination C5Cn.1n 302.30 21.400 PF-LO Tenuitella munda 341.10

16.293 MR-Onset C5Cn.1n 310.50 22.400 1170-benthic ¹⁸O 249.36 16.726 MR-Onset C5Cn.3n 314.10 22.600 PF-FO Globoturborotalita woodi 373.97

16.327 MR-Termination C5Cn.2n 311.00 22.800 1170-bulk ¹³C 251.00 17.277 MR-Termination C5Dn 316.90 23.200 PF-FO Globoquadrina dehiscens 407.64

16.488 MR-Onset C5Cn.2n 312.00 23.150 1170-benthic ¹³C 251.90 18.281 MR-Termination C5En 320.20 23.750 1170-Mi1 peaks 414.00

17.615 MR-Onset C5Dn 323.00
Top of gap 253.84 18.781 MR-Onset C5En 324.00 23.900 1170-Mi1 peaks 420.00

18.781 MR-Onset C5En 338.00
Bottom of gap 258.50 19.048 MR-Termination C6n 325.80 24.730 MR-1-Termination C7n.1n 428.05

19.048 MR-Termination C6n 341.00 23.880 1170-benthic ¹⁸O 258.56 20.131 MR-Onset C6n 333.10 25.183 MR-1-Onset C7n.2n 462.65

21.634 1090 Mi-1a 365.76
Top of gap 264.88 21.790 1170-bulk ¹³C 339.86 25.496 MR-1-Termination C7An 472.00

21.700 1090 Mi-1a 366.59
Bottom of gap 268.10 22.490 1170-benthic ¹³C 342.51 27.027 MR-1-Termination C9n 509.35

21.859 MR-Onset C6AAn 370.50 26.400 1170-bulk ¹³C 268.76 22.810 1170-bulk ¹³C 342.86 27.972 MR-1-Onset C9n 546.20

22.151 MR-Termination C6AAr.1n 372.20 26.900 1170-benthic ¹³C 269.26 23.150 1170-benthic ¹³C 343.26 28.283 MR-1-Termination C10n.1n 572.90

22.459 MR-Termination C6AAr.2n 374.90 30.240 D-FO Rocella vigilans-~top MPC 272.90 23.950 1170-benthic ¹⁸O 344.37 28.512 MR-1-Onset C10n.1n 597.80

22.493 MR-Onset C6AAr.2n 375.40

26.340 1170-bulk ¹³C 347.31 28.578 MR-1-Termination C10n.2n 602.45

22.588 MR-Termination C6Bn.1n 375.80

29.401 MR-Termination C11n.1n 356.10 29.401 MR-1-Termination C11n.1n 706.10

Top of gap 376.58

29.662 MR-Onset C11n.1n 356.80 29.662 MR-1-Onset C11n.1n 716.70

22.804 MR-Termination C6Bn.2n-bottom of gap 377.40

29.765 MR-Termination C11n.2n 357.30 29.765 MR-1-Termination C11n.2n 718.48

23.535 MR-Onset C6Cn.1n 380.00

30.098 MR-Onset C11n.2n-~top MPC 358.60 30.098 MR-1-Onset C11n.2n 729.90

23.677 MR-Termination C6Cn.2n 382.00

30.479 MR-1-Termination C12n 733.95

23.800 MR-Onset C6Cn.2n 382.90

30.939 MR-1-Onset C12n 740.00

24.118 MR-Onset C6Cn.3n 386.00

24.730 MR-Termination C7n.1n 393.40

24.781 MR-Onset C7n.1n 394.00

25.496 MR-Termination C7An 395.00

25.648 MR-Onset C7An 396.20

25.823 MR-Termination C8n.1n 397.00

26.100 NF-LO Chiasmolithus altus 397.46

26.554 MR-Onset C8n.2n 398.60

27.027 MR-Termination C9n 402.00

27.972 MR-Onset C9n 403.00

28.283 MR-Termination C10n.1n 406.50

29.401 MR-Termination C11n.1n 440.00

30.240 D-FO Rocella vigilans - ~top MPC 458.55

Notes: FO = first occurrence, LO = last occurrence. D = diatom, DF = dinocyst, NF = nannofossil, PF = planktonic foraminifer, RD = radiolarian. MR = magnetic reversal. MPC = Marshall Paraconformity. Gap = recovery gap.