Spot	 
%
206Pbc	ppm
U	ppm
Th	232Th
/238U	%
Dis-
cor-
dant	4corr
207r
/206r	err	4corr
207r
/235	err	4corr
206r
/238	err	err
corr	(1)
206Pb
/238U
Age	(1)
207Pb
/206Pb
Age	
490-1	0.47	156	170	1.12	5 	0.0739 	±0.0020 	 1.727	±0.080	0.1683	±0.0066	.848	1,003	± 36	1,054  	± 49  	
490-2	0.19	139	79	0.59	14 	0.1904 	±0.0022 	11.58 	±0.47 	0.441 	±0.017 	.961	2,354	± 78	2,747  	± 19  	
490-3	0.33	60	53	0.90	1 	0.1940 	±0.0023 	14.28 	±0.60 	0.533 	±0.022 	.962	2,755	± 91	2,779  	± 19  	
490-4	0.06	168	4	0.03	0 	0.1825 	±0.0011 	12.91 	±0.51 	0.513 	±0.020 	.988	2,670	± 85	2,676  	± 10  	
490-5	0.20	84	63	0.78	1 	0.1738 	±0.0017 	11.69 	±0.48 	0.487 	±0.019 	.971	2,560	± 84	2,596  	± 16  	
490-6	0.16	291	104	0.37	-3 	0.08603	±0.00090	 2.83 	±0.11 	0.2383	±0.0091	.967	1,378	± 48	1,343  	± 20  	
490-7	-- 	85	47	0.57	7 	0.1178 	±0.0018 	 5.16 	±0.22 	0.318 	±0.013 	.936	1,780	± 63	1,922  	± 27  	
490-8	0.65	169	95	0.58	8 	0.0754 	±0.0025 	 1.775	±0.087	0.1692	±0.0066	.796	1,008	± 36	1,098  	± 59  	
490-9	1.27	139	111	0.82	-16 	0.0644 	±0.0036 	 1.411	±0.089	0.1555	±0.0062	.634	  932	± 35	  801  	±100  	
490-10	0.29	64	68	1.10	4 	0.0860 	±0.0019 	 2.63 	±0.12 	0.2207	±0.0090	.880	1,286	± 47	1,344  	± 42  	
490-11	6.01	30	29	1.01	4 	0.071  	±0.015  	 1.96 	±0.35 	0.1839	±0.0088	.264	1,088	± 48	1,132  	±350  	
490-12	0.17	166	185	1.15	-5 	0.0999 	±0.0013 	 4.18 	±0.17 	0.303 	±0.012 	.953	1,707	± 58	1,625  	± 23  	
490-13	0.07	336	138	0.42	-5 	0.0798 	±0.0014 	 2.37 	±0.10 	0.2154	±0.0083	.910	1,257	± 44	1,194  	± 35  	
490-14	0.18	229	37	0.17	8 	0.1961 	±0.0015 	13.25 	±0.52 	0.490 	±0.019 	.982	2,569	± 82	2,795  	± 12  	
490-15	0.09	201	117	0.60	4 	0.1978 	±0.0015 	14.21 	±0.56 	0.521 	±0.020 	.983	2,703	± 86	2,809  	± 12  	
490-16	1.40	54	67	1.27	12 	0.1044 	±0.0048 	 3.87 	±0.24 	0.265 	±0.012 	.733	1,516	± 61	1,729  	± 77  	
490-17	0.58	49	44	0.92	13 	0.1418 	±0.0024 	 6.96 	±0.32 	0.355 	±0.015 	.932	1,958	± 72	2,255  	± 29  	
490-18	0.41	45	41	0.93	-3 	0.1718 	±0.0033 	12.04 	±0.55 	0.507 	±0.021 	.915	2,645	± 91	2,579  	± 31  	
490-19	1.72	50	37	0.76	-10 	0.0691 	±0.0060 	 1.74 	±0.15 	0.1775	±0.0076	.495	1,053	± 41	  957  	±150  	
490-20	9.86	120	82	0.71	10 	0.071  	±0.012  	 2.17 	±0.28 	0.1911	±0.0079	.317	1,128	± 43	1,251  	±240  	
490-21	0.00	183	236	1.33	8 	0.0754 	±0.0014 	 1.727	±0.075	0.1662	±0.0065	.897	  991	± 36	1,078  	± 38  	
490-22	2.88	39	13	0.33	-27 	0.069  	±0.011  	 2.18 	±0.30 	0.2182	±0.0094	.319	1,273	± 51	1,003  	±260  	
490-23	0.12	72	90	1.28	2 	0.1885 	±0.0018 	13.46 	±0.55 	0.517 	±0.021 	.973	2,688	± 88	2,730  	± 16  	
																	
 Spot	 
%
206Pbc	ppm
U	ppm
Th	232Th
/238U	%
Dis-
cor-
dant	4corr
207r
/206r	err	4corr
207r
/235	err	4corr
206r
/238	err	err
corr	(1)
206Pb
/238U
Age	(1)
207Pb
/206Pb
Age	
490-24	0.07	88	69	0.80	3 	0.1907 	±0.0018 	13.47 	±0.55 	0.512 	±0.020 	.974	2,665	± 87	2,748  	± 15  	
490-25	0.31	161	190	1.22	-4 	0.0728 	±0.0018 	 1.795	±0.081	0.1780	±0.0070	.864	1,056	± 38	1,018  	± 46  	
490-26	0.04	511	185	0.37	1 	0.09082	±0.00077	 3.09 	±0.12 	0.2469	±0.0094	.978	1,422	± 49	1,444  	± 16  	
490-27	0.01	721	248	0.36	3 	0.09165	±0.00056	 3.12 	±0.12 	0.2469	±0.0094	.988	1,423	± 49	1,460  	± 12  	
490-28	0.46	88	27	0.32	-5 	0.0718 	±0.0029 	 1.745	±0.096	0.1751	±0.0070	.731	1,040	± 39	  994  	± 76  	
490-29	0.24	248	10	0.04	-3 	0.0733 	±0.0013 	 1.801	±0.076	0.1776	±0.0069	.916	1,054	± 38	1,028  	± 34  	
490-30	0.21	223	258	1.20	4 	0.0743 	±0.0011 	 1.759	±0.073	0.1711	±0.0066	.938	1,018	± 36	1,057  	± 29  	
490-31	0.09	168	24	0.15	7 	0.1544 	±0.0013 	 8.84 	±0.35 	0.415 	±0.016 	.979	2,238	± 73	2,396  	± 14  	
490-32	0.17	167	53	0.33	-4 	0.0864 	±0.0013 	 2.91 	±0.12 	0.2439	±0.0095	.936	1,407	± 49	1,352  	± 28  	
490-33	0.05	534	76	0.15	-2 	0.07382	±0.00068	 1.813	±0.071	0.1780	±0.0068	.973	1,056	± 37	1,038  	± 18  	
490-34	0.02	400	188	0.48	-1 	0.08709	±0.00085	 2.87 	±0.11 	0.2393	±0.0092	.971	1,383	± 48	1,363  	± 18  	
490-35	0.01	596	177	0.31	10 	0.1737 	±0.0015 	10.43 	±0.41 	0.435 	±0.017 	.976	2,330	± 75	2,594  	± 14  	
490-36	0.07	332	468	1.46	41 	0.18267	±0.00084	 7.02 	±0.28 	0.279 	±0.011 	.993	1,584	± 55	2,678	±  7.6	
490-37	0.02	390	141	0.37	-143 	0.151  	±0.020  	29.8  	±4.2  	1.431 	±0.058 	.290	5,726	±150	2,359  	±230  	
490-38	0.08	210	118	0.58	-29 	0.1042 	±0.0058 	 5.83 	±0.40 	0.405 	±0.016 	.582	2,194	± 74	1,702  	±100  	
490-39	0.01	128	54	0.44	-1 	0.2055 	±0.0014 	16.16 	±0.65 	0.570 	±0.022 	.984	2,909	± 92	2,871  	± 11  	
490-40	1.19	93	28	0.31	-8 	0.0746 	±0.0035 	 2.09 	±0.12 	0.2001	±0.0081	.702	1,176	± 43	1,093  	± 82  	
490-41	0.12	163	62	0.40	1 	0.1184 	±0.0014 	 5.62 	±0.23 	0.344 	±0.013 	.961	1,905	± 65	1,934  	± 20  	
490-42	0.27	153	64	0.43	3 	0.1177 	±0.0017 	 5.45 	±0.23 	0.335 	±0.013 	.946	1,864	± 64	1,925  	± 24  	
490-43	0.85	491	206	0.43	2 	0.0766 	±0.0015 	 2.016	±0.085	0.1886	±0.0072	.910	1,114	± 39	1,135  	± 35  	
490-44	0.21	255	174	0.71	4 	0.1800 	±0.0012 	12.12 	±0.47 	0.488 	±0.019 	.986	2,561	± 82	2,655  	± 11  	
490-45	0.14	262	82	0.32	7 	0.1855 	±0.0017 	12.13 	±0.49 	0.474 	±0.018 	.973	2,501	± 81	2,703  	± 15  	
490-46	1.49	154	62	0.42	12 	0.0746 	±0.0042 	 1.70 	±0.11 	0.1620	±0.0065	.636	  968	± 36	1,102  	± 97  	
																	
 Spot	 
%
206Pbc	ppm
U	ppm
Th	232Th
/238U	%
Dis-
cor-
dant	4corr
207r
/206r	err	4corr
207r
/235	err	4corr
206r
/238	err	err
corr	(1)
206Pb
/238U
Age	(1)
207Pb
/206Pb
Age	
490-46	1.49	154	62	0.42	12 	0.0746 	±0.0042 	 1.70 	±0.11 	0.1620	±0.0065	.636	  968	± 36	1,102  	± 97  	
490-47	0.62	76	43	0.59	20 	0.0845 	±0.0032 	 2.09 	±0.11 	0.1782	±0.0074	.766	1,057	± 40	1,320  	± 67  	
490-48	0.32	266	185	0.72	3 	0.1049 	±0.0019 	 4.30 	±0.18 	0.297 	±0.011 	.907	1,674	± 57	1,719  	± 33  	
490-49	0.15	187	78	0.43	6 	0.0946 	±0.0019 	 3.26 	±0.14 	0.2499	±0.0097	.895	1,438	± 50	1,523  	± 37  	
490-50	0.25	201	99	0.51	9 	0.0793 	±0.0012 	 2.004	±0.085	0.1827	±0.0072	.937	1,082	± 39	1,186  	± 29  	
490-51	1.06	635	234	0.38	54 	0.2458 	±0.0020 	 8.70 	±0.34 	0.2561	±0.0098	.980	1,470	± 50	3,161  	± 12  	
490-52	2.39	50	20	0.43	-23 	0.0777 	±0.0073 	 2.86 	±0.26 	0.259 	±0.011 	.465	1,483	± 57	1,205  	±160  	
490-53	0.75	145	51	0.37	0 	0.0839 	±0.0030 	 2.64 	±0.13 	0.2261	±0.0089	.778	1,314	± 47	1,308  	± 62  	
490-54	0.69	363	127	0.36	29 	0.0982 	±0.0019 	 2.65 	±0.11 	0.1943	±0.0075	.913	1,145	± 40	1,603  	± 32  	
490-55	1.59	133	50	0.39	-20 	0.0654 	±0.0039 	 1.57 	±0.10 	0.1698	±0.0068	.616	1,011	± 37	  843  	±110  	
490-56	0.39	921	193	0.22	8 	0.08290	±0.00085	 2.291	±0.090	0.1994	±0.0076	.970	1,172	± 41	1,277  	± 19  	
490-57	0.10	244	375	1.59	6 	0.1896 	±0.0012 	12.77 	±0.51 	0.488 	±0.019 	.988	2,563	± 83	2,740  	± 10  	
490-58	2.12	49	29	0.62	6 	0.097  	±0.013  	 3.57 	±0.49 	0.262 	±0.012 	.326	1,501	± 60	1,603  	±240  	
490-59	3.24	73	36	0.51	-11 	0.054  	±0.010  	 0.71 	±0.11 	0.0895	±0.0040	.284	  553	± 24	  500  	±330  	

Errors are 1-sigma; Pbc and Pb* indicate the common and radiogenic portions, respectively.
Error in Standard calibration was 1.5%
(1) Common Pb corrected using measured 204Pb.