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	
503-1	0.30	152	95	0.64	2 	0.0948 	±0.0010 	 3.40 	±0.11 	0.2605	±0.0083	.948	1,492	± 42	1,524  	± 20  	
503-2	0.78	27	9	0.35	2 	0.2049 	±0.0036 	15.41 	±0.61 	0.545 	±0.019 	.894	2,806	± 81	2,866  	± 29  	
503-4	0.27	450	246	0.57	-1 	0.07485	±0.00075	 1.882	±0.062	0.1823	±0.0057	.953	1,080	± 31	1,065  	± 20  	
503-5	2.01	46	32	0.71	2 	0.1990 	±0.0043 	14.67 	±0.58 	0.535 	±0.018 	.835	2,761	± 74	2,818  	± 36  	
503-6	2.66	45	34	0.78	5 	0.0806 	±0.0066 	 2.16 	±0.19 	0.1947	±0.0067	.388	1,147	± 36	1,211  	±160  	
503-7	1.31	139	60	0.44	-2 	0.0860 	±0.0031 	 2.81 	±0.14 	0.2370	±0.0076	.658	1,371	± 39	1,338  	± 71  	
503-8	0.64	121	34	0.29	1 	0.1965 	±0.0013 	14.61 	±0.47 	0.539 	±0.017 	.978	2,779	± 71	2,798  	± 11  	
503-9	2.61	332	149	0.46	41 	0.1783 	±0.0018 	 6.71 	±0.22 	0.2729	±0.0085	.951	1,555	± 43	2,637  	± 17  	
503-10	0.66	60	20	0.34	-3 	0.1957 	±0.0021 	15.23 	±0.53 	0.565 	±0.019 	.951	2,885	± 76	2,791  	± 18  	
503-11	2.63	35	20	0.60	14 	0.0815 	±0.0078 	 2.02 	±0.21 	0.1794	±0.0064	.346	1,064	± 35	1,233  	±190  	
503-12	0.91	26	14	0.56	-4 	0.2082 	±0.0032 	17.05 	±0.65 	0.594 	±0.021 	.914	3,005	± 84	2,891  	± 25  	
503-13	0.45	112	74	0.68	-1 	0.2222 	±0.0014 	18.37 	±0.59 	0.599 	±0.019 	.982	3,027	± 77	2,997	±  9.9	
503-14	1.21	105	68	0.67	-9 	0.0969 	±0.0026 	 4.04 	±0.17 	0.3021	±0.0097	.766	1,702	± 48	1,566  	± 51  	
503-15	1.21	45	59	1.37	2 	0.1877 	±0.0025 	13.29 	±0.48 	0.514 	±0.017 	.928	2,672	± 73	2,722  	± 22  	
503-16	0.54	335	86	0.27	9 	0.19187	±0.00082	12.52 	±0.39 	0.473 	±0.015 	.991	2,497	± 64	2,758	±  7.0	
503-17	0.80	128	134	1.09	2 	0.1841 	±0.0013 	12.79 	±0.42 	0.504 	±0.016 	.976	2,631	± 69	2,690  	± 12  	
503-18	0.92	168	67	0.41	7 	0.0765 	±0.0021 	 1.833	±0.077	0.1737	±0.0055	.760	1,033	± 30	1,109  	± 54  	
503-19	1.27	48	52	1.11	2 	0.1856 	±0.0031 	12.99 	±0.48 	0.508 	±0.017 	.897	2,647	± 73	2,703  	± 27  	
503-20	0.60	56	73	1.35	2 	0.1956 	±0.0022 	14.26 	±0.50 	0.529 	±0.017 	.947	2,737	± 73	2,790  	± 18  	
503-21	0.91	86	65	0.79	5 	0.0937 	±0.0021 	 3.21 	±0.13 	0.2483	±0.0081	.817	1,429	± 42	1,503  	± 43  	
503-22	0.44	157	25	0.16	5 	0.1569 	±0.0013 	 9.32 	±0.31 	0.431 	±0.014 	.967	2,309	± 62	2,422  	± 14  	
503-23	1.37	26	32	1.30	-3 	0.1829 	±0.0044 	13.41 	±0.58 	0.532 	±0.019 	.833	2,748	± 80	2,679  	± 39  	
503-24	0.23	258	214	0.86	0 	0.18635	±0.00076	13.40 	±0.43 	0.522 	±0.016 	.992	2,706	± 70	2,710	±  6.7	
																	
 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	
503-25	1.92	21	22	1.04	1 	0.1758 	±0.0046 	12.03 	±0.54 	0.496 	±0.018 	.814	2,598	± 78	2,613  	± 43  	
503-26	2.99	37	36	0.99	7 	0.2042 	±0.0069 	14.29 	±0.73 	0.507 	±0.019 	.749	2,646	± 83	2,860  	± 55  	
503-27	1.37	74	97	1.34	-67 	0.175  	±0.011  	23.4  	±1.8  	0.969 	±0.039 	.521	4,368	±130	2,611  	±110  	
503-28	1.46	85	88	1.07	4 	0.0987 	±0.0022 	 3.68 	±0.15 	0.2704	±0.0091	.837	1,543	± 46	1,600  	± 41  	
503-29	1.12	162	307	1.96	5 	0.1847 	±0.0021 	12.44 	±0.43 	0.488 	±0.016 	.945	2,563	± 69	2,696  	± 19  	
503-30	1.60	108	44	0.42	-9 	0.0986 	±0.0054 	 4.23 	±0.27 	0.311 	±0.011 	.526	1,744	± 52	1,598  	±100  	
503-31	5.96	83	78	0.96	-18 	0.075  	±0.012  	 2.25 	±0.38 	0.2167	±0.0077	.213	1,264	± 41	1,075  	±330  	
503-32	1.91	70	38	0.56	1 	0.2052 	±0.0037 	15.67 	±0.61 	0.554 	±0.019 	.883	2,841	± 79	2,868  	± 30  	
503-33	0.98	235	477	2.09	9 	0.1008 	±0.0022 	 3.60 	±0.14 	0.2588	±0.0084	.827	1,484	± 43	1,639  	± 41  	
503-34	0.29	188	92	0.50	-1 	0.2236 	±0.0013 	18.64 	±0.61 	0.605 	±0.019 	.985	3,049	± 78	3,007	±  9.1	
503-35	0.50	81	69	0.87	1 	0.1952 	±0.0022 	14.30 	±0.51 	0.531 	±0.018 	.948	2,747	± 76	2,786  	± 19  	
503-36	1.60	22	11	0.51	12 	0.1861 	±0.0068 	11.41 	±0.68 	0.445 	±0.021 	.790	2,372	± 93	2,708  	± 60  	
503-38	0.70	33	21	0.65	5 	0.2000 	±0.0040 	14.21 	±0.61 	0.515 	±0.020 	.887	2,680	± 84	2,826  	± 32  	
503-39	2.53	117	60	0.53	-1 	0.0758 	±0.0063 	 1.94 	±0.17 	0.1861	±0.0064	.384	1,100	± 35	1,089  	±170  	
503-40	3.60	58	23	0.40	0 	0.0755 	±0.0084 	 1.90 	±0.22 	0.1827	±0.0068	.315	1,082	± 37	1,083  	±220  	
503-41	4.84	30	23	0.79	0 	0.211  	±0.012  	16.5  	±1.2  	0.569 	±0.022 	.566	2,904	± 92	2,913  	± 93  	
503-42	0.67	122	47	0.39	3 	0.1881 	±0.0024 	13.17 	±0.46 	0.508 	±0.016 	.929	2,648	± 70	2,726  	± 21  	
503-43	1.64	62	56	0.94	18 	0.227  	±0.029  	14.8  	±2.0  	0.473 	±0.017 	.277	2,496	± 77	3,033  	±210  	
503-44	1.84	66	57	0.90	-1 	0.1837 	±0.0029 	13.22 	±0.49 	0.522 	±0.018 	.905	2,707	± 75	2,686  	± 26  	
503-45	1.71	114	40	0.37	-45 	0.0829 	±0.0044 	 3.76 	±0.24 	0.329 	±0.012 	.566	1,831	± 58	1,267  	±100  	
503-46	1.42	98	74	0.77	45 	0.37   	±0.14   	19.7  	±7.3  	0.382 	±0.016 	.116	2,085	± 77	3,808  	±560  	
503-47	3.58	45	25	0.57	-74 	0.113  	±0.012  	10.2  	±1.3  	0.650 	±0.043 	.528	3,228	±170	1,856  	±190  	
503-48	1.01	111	196	1.82	38 	0.201  	±0.020  	 8.75 	±0.93 	0.315 	±0.011 	.334	1,767	± 55	2,836  	±160  	
																	
 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	
503-49	1.35	181	33	0.19	-119 	0.0984 	±0.0037 	 9.77 	±0.53 	0.721 	±0.029 	.730	3,498	±110	1,594  	± 70  	
503-50	3.55	44	25	0.59	22 	0.1653 	±0.0060 	 8.07 	±0.42 	0.354 	±0.013 	.721	1,954	± 64	2,510  	± 61  	
503-51	1.80	92	34	0.38	20 	0.1913 	±0.0026 	10.75 	±0.40 	0.408 	±0.014 	.929	2,204	± 64	2,753  	± 23  	
503-52	1.07	81	41	0.53	7 	0.1987 	±0.0027 	13.81 	±0.50 	0.504 	±0.017 	.929	2,631	± 73	2,816  	± 22  	
503-53	4.61	25	15	0.61	-1 	0.175  	±0.012  	12.2  	±1.0  	0.505 	±0.022 	.532	2,637	± 96	2,606  	±120  	
503-54	0.47	285	120	0.44	12 	0.1864 	±0.0043 	11.50 	±0.46 	0.447 	±0.014 	.810	2,383	± 64	2,711  	± 38  	
503-55	1.52	98	53	0.56	-42 	0.1954 	±0.0059 	22.9  	±1.3  	0.849 	±0.041 	.843	3,964	±140	2,788  	± 50  	
503-56	10.17	51	119	2.41	-5 	0.157  	±0.027  	10.5  	±2.0  	0.486 	±0.038 	.416	2,552	±160	2,427  	±290  	

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.