Table 3. U-Th concentrations and isotope ratios for Leg 166 samples, together with age information derived from them.

Sample identifier	238U (ppm)	232Th (ppb)	232Th/230Th	234U (0)	(230Th/238U)	Raw age (ka)	Scavenging corrected age (ka)	234U (T)	MIS stage
3-1	4.080 ± 0.006	40.18 ± 0.22	6271 ± 81	144.0 ± 4.9	0.095 ± 0.002	9.5 ± 0.2	5 ± 6	146.0 ± 5.7	1
3-2	3.636 ± 0.002	29.90 ± 0.06	496 ± 2	28.6 ± 2.1	1.010 ± 0.002	387.9 ± 11.5	383 ± 13	84.5 ± 6.2	11
3-3	3.857 ± 0.002	23.63 ± 0.09	377 ± 2	-12.7 ± 3.1	0.997 ± 0.004				>11
3-4	3.324 ± 0.002	42.15 ± 0.09	790 ± 4	-19.6 ± 2.9	0.980 ± 0.002				>11
3-5	3.274 ± 0.001	28.59 ± 0.05	530 ± 2	9.2 ± 2.0	1.003 ± 0.002	505.9 ± 27.5	497 ± 28	37.6 ± 7.5	>11
3-6	3.890 ± 0.002	37.85 ± 0.10	592 ± 2	-4.7 ± 2.7	1.005 ± 0.003
5-1	4.197 ± 0.003	54.20 ± 0.49	6557 ± 286	148.2 ± 2.9	0.120 ± 0.038	12.0 ± 0.5	6 ± 8	150.7 ± 4.5	1
5-2	4.395 ± 0.003	31.97 ± 0.15	405 ± 2	113.7 ± 3.0	1.093 ± 0.005	325.1 ± 11.5	322 ± 12	282.9 ± 8.2	5
5-3	3.409 ± 0.002	44.24 ± 0.19	722 ± 3	68.7 ± 3.4	1.096 ± 0.006				7
5-4	3.704 ± 0.003	57.62 ± 0.20	793 ± 3	79.7 ± 3.9	1.198 ± 0.004				7
5-5	3.468 ± 0.003	39.21 ± 0.43	634 ± 9	45.0 ± 3.0	1.078 ± 0.020				9
5-6	3.628 ± 0.003	77.49 ± 0.63	1230 ± 11	30.7 ± 3.2	1.061 ± 0.015				11
6-1	4.016 ± 0.004	97.86 ± 0.25	8281 ± 101	146.1 ± 2.9	0.179 ± 0.003	18.4 ± 0.3	7 ± 14	149.1 ± 6.6	1
6-2	4.092 ± 0.003	43.31 ± 0.10	879 ± 4	109.5 ± 2.3	0.734 ± 0.002	114.7 ± 0.8	110 ± 6	149.4 ± 4.2	5
6-3	3.962 ± 0.003	34.85 ± 0.10	543 ± 3	42.6 ± 2.3	0.986 ± 0.003	296.0 ± 5.9	291 ± 8	97.3 ± 5.5	9
6-4	2.870 ± 0.002	31.38 ± 0.08	678 ± 3	31.0 ± 2.2	0.985 ± 0.003	318.4 ± 6.8	312 ± 10	75.2 ± 5.5	11
7-1	3.643 ± 0.004	43.68 ± 0.13	2643 ± 17	136.8 ± 3.5	0.276 ± 0.007	30.1 ± 0.3	24 ± 7	146.6 ± 4.9	1
7-2	2.625 ± 0.002	42.10 ± 0.20	1012 ± 7	-2.3 ± 3.4	0.970 ± 0.007	394.6 ± 34.2	385 ± 36	-6.9 ± 10.0	>11

Notes: All errors are 2 s.e. and are propagated to include weighing error, blank uncertainty, and in-run statistical error from the analyses. ²³⁴U(0) = [(²³⁴U/²³⁸U) - 1]/1000, where parentheses signify an activity ratio. Raw age is calculated directly from the data in the previous two columns. Scavenging corrected age = the age corrected for initial ²³⁰Th by assuming that all ²³²Th is scavenged from seawater at a ²³²Th/²³⁰Th ratio of 12,000 ± 6,000. Only those ages listed in bold give ²³⁴U(T) values that indicate little or no diagenesis; other samples have suffered diagenesis and the ages are therefore not correct. ²³⁴U(T), which equals ²³⁴U(0)·e^234·T, is an expression of the initial ²³⁴U. MIS stage = the marine oxygen isotope stage during which the sample is thought to have formed based on the diagenetic model discussed in the text and in Figure 3.