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	
474-31	1.35	106	48	0.47	-3 	.0692	.0040	1.49	0.10	.1558	.0063	.574	933	35	904	118	
474-25	2.03	66	25	0.40	-5 	.0692	.0086	1.51	0.20	.1581	.0066	.318	946	37	905	256	
474-53	1.13	87	32	0.38	0 	.0717	.0051	1.63	0.13	.1647	.0067	.499	983	37	978	144	
474-46	0.51	335	102	0.32	10 	.0729	.0017	1.52	0.07	.1512	.0059	.865	908	33	1,012	46	
474-6	0.95	76	38	0.51	-4 	.0730	.0032	1.79	0.11	.1778	.0073	.679	1,055	40	1,013	90	
474-39	1.04	67	37	0.57	-3 	.0746	.0050	1.89	0.15	.1840	.0076	.525	1,089	42	1,058	135	
474-33	0.57	75	89	1.23	23 	.0781	.0058	1.59	0.14	.1476	.0063	.499	887	35	1,150	147	
474-21	2.16	344	170	0.51	33 	.0794	.0046	1.42	0.10	.1299	.0050	.556	787	29	1,183	114	
474-50	1.24	51	53	1.06	22 	.0796	.0076	1.71	0.18	.1555	.0067	.413	931	37	1,187	188	
474-15	0.06	619	195	0.33	10 	.0825	.0006	2.19	0.09	.1928	.0074	.983	1,136	40	1,257	14	
474-24	2.43	39	35	0.92	31 	.0825	.0126	1.63	0.26	.1436	.0068	.295	865	38	1,257	299	
474-14	0.10	764	248	0.33	5 	.0829	.0006	2.34	0.09	.2050	.0079	.982	1,202	42	1,267	14	
474-4	0.22	357	119	0.34	5 	.0835	.0011	2.39	0.10	.2077	.0080	.946	1,217	43	1,280	26	
474-41	1.21	31	10	0.31	25 	.0842	.0074	1.89	0.19	.1633	.0074	.459	975	41	1,296	171	
474-42	0.30	446	147	0.34	10 	.0842	.0014	2.31	0.10	.1988	.0077	.916	1,169	41	1,297	33	
474-35	0.07	219	96	0.45	12 	.0854	.0011	2.33	0.10	.1980	.0077	.953	1,165	42	1,325	24	
474-48	0.14	452	222	0.51	3 	.0856	.0009	2.62	0.11	.2222	.0086	.966	1,293	45	1,330	20	
474-30	0.51	214	125	0.60	3 	.0861	.0018	2.65	0.12	.2231	.0088	.880	1,298	46	1,342	41	
474-1	0.70	92	35	0.39	1 	.0870	.0033	2.79	0.15	.2328	.0093	.729	1,349	49	1,359	73	
474-34	0.69	91	64	0.73	22 	.0874	.0032	2.17	0.12	.1800	.0073	.738	1,067	40	1,369	71	
474-2	0.24	422	112	0.27	19 	.0878	.0010	2.27	0.09	.1878	.0072	.957	1,109	39	1,378	22	
474-20	0.18	267	94	0.36	17 	.0886	.0013	2.40	0.10	.1966	.0077	.936	1,157	42	1,396	28	
474-11	0.05	245	141	0.59	4 	.0887	.0010	2.82	0.11	.2305	.0090	.964	1,337	47	1,397	21	
																	
 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	
474-29	0.18	570	227	0.41	20 	.0896	.0015	2.37	0.10	.1919	.0074	.913	1,131	40	1,417	33	
474-12	2.30	37	31	0.88	-7 	.0904	.0069	3.35	0.30	.2689	.0116	.488	1,535	59	1,434	147	
474-19	0.21	231	79	0.35	6 	.0936	.0015	3.16	0.13	.2450	.0095	.925	1,413	49	1,500	30	
474-32	1.65	169	53	0.32	-10 	.0945	.0086	3.87	0.39	.2969	.0119	.400	1,676	59	1,517	173	
474-51	0.70	121	117	1.00	1 	.0972	.0024	3.64	0.17	.2714	.0108	.853	1,548	55	1,571	46	
474-9	0.03	23	23	1.03	36 	.0979	.0037	2.29	0.14	.1699	.0079	.778	1,011	43	1,584	70	
474-37	0.46	89	96	1.11	8 	.0989	.0030	3.51	0.18	.2577	.0104	.796	1,478	53	1,603	57	
474-36	0.03	257	335	1.34	1 	.1023	.0009	4.13	0.16	.2932	.0114	.976	1,657	57	1,666	16	
474-43	0.64	95	26	0.28	15 	.1037	.0030	3.58	0.18	.2507	.0101	.817	1,442	52	1,691	52	
474-38	0.47	167	55	0.34	4 	.1040	.0019	4.12	0.18	.2871	.0113	.910	1,627	56	1,698	33	
474-52	0.08	237	341	1.49	0 	.1054	.0010	4.46	0.18	.3067	.0120	.969	1,725	59	1,721	18	
474-8	0.17	174	102	0.61	1 	.1055	.0014	4.39	0.18	.3014	.0118	.946	1,698	58	1,723	25	
474-10	0.12	291	22	0.08	12 	.1070	.0010	3.97	0.16	.2693	.0105	.974	1,537	53	1,750	17	
474-17	0.13	158	42	0.28	2 	.1074	.0013	4.55	0.19	.3074	.0121	.958	1,728	59	1,756	21	
474-26	0.47	223	63	0.29	19 	.1085	.0024	3.73	0.17	.2497	.0099	.875	1,437	51	1,774	40	
474-40	0.90	45	18	0.43	12 	.1095	.0056	4.18	0.28	.2768	.0118	.638	1,575	60	1,791	94	
474-7	0.20	238	83	0.36	15 	.1128	.0011	4.31	0.17	.2771	.0108	.969	1,577	54	1,844	18	
474-54	0.77	140	402	2.97	11 	.1129	.0030	4.53	0.22	.2910	.0118	.835	1,647	59	1,847	48	
474-22	2.39	40	10	0.27	23 	.1261	.0139	4.79	0.57	.2754	.0117	.358	1,568	59	2,045	195	
474-45	0.13	407	164	0.42	9 	.1287	.0009	6.07	0.24	.3419	.0132	.985	1,896	63	2,080	12	
474-28	0.23	74	9	0.12	30 	.1372	.0055	5.06	0.29	.2676	.0111	.717	1,529	56	2,192	70	
474-44	0.03	785	115	0.15	8 	.1762	.0007	11.01	0.42	.4533	.0174	.994	2,410	77	2,618	7	
474-49	0.36	112	117	1.08	2 	.1839	.0018	12.84	0.53	.5063	.0201	.970	2,641	86	2,688	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	
474-18	--	237	139	0.60	25 	.1847	.0011	9.31	0.37	.3657	.0142	.989	2,009	67	2,696	10	
474-13	0.06	266	212	0.82	9 	.1925	.0011	12.60	0.49	.4747	.0184	.989	2,504	80	2,764	9	
474-47	0.17	220	100	0.47	10 	.1931	.0012	12.65	0.50	.4749	.0185	.988	2,505	81	2,769	10	
474-3	0.19	81	26	0.33	10 	.1951	.0021	12.79	0.53	.4756	.0190	.967	2,508	83	2,786	17	
474-23	0.48	67	29	0.45	-1 	.1992	.0024	15.19	0.65	.5531	.0227	.958	2,838	94	2,820	20	
474-5	0.04	215	34	0.16	16 	.2101	.0012	13.39	0.53	.4623	.0179	.990	2,449	79	2,907	9	
474-27	--	29	17	0.60	25 	.2439	.0110	14.82	0.96	.4407	.0204	.715	2,354	91	3,146	72	
474-16	96.90	61	10	0.16	--	.0000	.0000	0.00	0.00	.1152	1.059	.000	703	6125			
474-52a	1.93	76	61	0.83	2 	.1094	.0077	4.69	0.36	.3111	.0097	.405	1,746	47	1,790	128	

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.