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	
521-1	1.46	186	147	0.82	-9 	.0954	.0027	3.89	0.20	.2960	.0124	.824	1671	62	1535	54	
521-2	0.57	317	117	0.38	-2 	.0784	.0024	2.17	0.11	.2008	.0083	.800	1179	45	1157	62	
521-3	1.21	192	172	0.92	-4 	.0919	.0039	3.39	0.20	.2677	.0112	.704	1529	57	1465	80	
521-4	1.53	83	37	0.46	-6 	.1066	.0057	4.88	0.34	.3322	.0144	.629	1849	70	1742	98	
521-5	0.60	320	352	1.14	-5 	.0773	.0033	2.15	0.13	.2015	.0084	.697	1183	45	1130	85	
521-6	3.86	182	31	0.17	21 	.0985	.0124	2.95	0.39	.2173	.0097	.336	1268	52	1596	235	
521-7	0.46	134	33	0.26	5 	.1191	.0021	5.43	0.25	.3305	.0140	.921	1841	68	1943	32	
521-8	0.92	230	2	0.01	1 	.0779	.0044	2.06	0.14	.1914	.0080	.596	1129	43	1145	112	
521-9	2.22	191	84	0.45	22 	.0973	.0096	2.82	0.30	.2102	.0090	.399	1230	48	1572	185	
521-10	0.74	648	426	0.68	-2 	.0774	.0036	2.10	0.13	.1963	.0081	.657	1156	43	1132	94	
521-11	4.66	24	8	0.32	-3 	.1075	.0183	4.78	0.85	.3227	.0164	.287	1803	80	1757	311	
521-12	0.89	151	43	0.29	-3 	.1010	.0034	4.17	0.22	.2995	.0126	.783	1689	62	1642	62	
521-13	2.14	72	17	0.25	3 	.0985	.0074	3.69	0.32	.2718	.0119	.505	1550	60	1597	140	
521-14	0.38	386	116	0.31	-5 	.1018	.0013	4.33	0.19	.3088	.0127	.958	1735	63	1657	23	
521-15	0.63	232	115	0.51	-2 	.1073	.0030	4.74	0.24	.3203	.0133	.833	1791	65	1754	51	
521-16	1.28	213	97	0.47	-10 	.1016	.0047	4.57	0.28	.3264	.0137	.673	1821	66	1653	85	
521-17	14.77	8	4	0.46	13 	.0999	.0513	3.36	1.74	.2437	.0181	.143	1406	94	1622	956	
521-18	0.48	259	111	0.44	-3 	.1042	.0030	4.50	0.23	.3134	.0131	.821	1757	64	1699	54	
521-19	0.42	243	93	0.39	9 	.0936	.0016	3.04	0.14	.2358	.0098	.922	1365	51	1501	33	
521-20	0.93	231	79	0.35	-6 	.0763	.0035	2.09	0.13	.1985	.0083	.678	1167	45	1102	90	
521-21	0.09	1152	382	0.34	-3 	.0923	.0006	3.36	0.14	.2640	.0108	.986	1510	55	1473	13	
521-22	0.83	201	80	0.41	-5 	.0929	.0044	3.50	0.22	.2733	.0114	.664	1557	58	1485	89	
521-23	0.52	446	182	0.42	1 	.0972	.0016	3.66	0.16	.2728	.0112	.927	1555	57	1572	31	
																	
 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	
521-24	2.27	85	52	0.63	-7 	.0901	.0096	3.33	0.38	.2678	.0117	.380	1530	60	1427	204	
521-25	0.33	319	173	0.56	-4 	.1065	.0016	4.77	0.21	.3251	.0134	.938	1815	65	1741	28	
521-26	0.47	143	93	0.67	-4 	.1095	.0039	5.07	0.28	.3356	.0142	.763	1865	68	1791	65	
521-27	0.06	2099	746	0.37	-4 	.0784	.0003	2.21	0.09	.2044	.0083	.994	1199	45	1158	9	
521-28	3.64	48	24	0.53	-8 	.0905	.0153	3.39	0.60	.2717	.0128	.268	1550	65	1437	322	
521-29	0.70	58	17	0.30	8 	.1191	.0050	5.28	0.32	.3214	.0142	.725	1797	69	1943	75	
521-30	2.39	206	52	0.26	6 	.0889	.0059	2.78	0.22	.2272	.0095	.532	1320	50	1402	128	
521-31	1.19	326	60	0.19	27 	.1040	.0055	3.05	0.21	.2127	.0089	.618	1243	47	1697	98	
521-32	2.26	62	77	1.28	-5 	.0996	.0061	4.11	0.31	.2997	.0132	.581	1690	65	1616	115	
521-33	0.13	1141	35	0.03	-3 	.0791	.0006	2.26	0.09	.2073	.0085	.985	1215	45	1175	14	
521-34	0.10	683	137	0.21	9 	.1036	.0019	3.87	0.17	.2708	.0111	.915	1545	56	1689	33	
521-35	0.66	187	71	0.39	-6 	.0999	.0018	4.21	0.19	.3054	.0128	.915	1718	63	1623	34	
521-36	0.09	831	210	0.26	-3 	.1086	.0006	4.93	0.20	.3293	.0135	.992	1835	65	1776	10	
521-37	0.36	351	107	0.32	-5 	.1005	.0011	4.22	0.18	.3045	.0126	.965	1714	62	1632	21	
521-38	0.46	245	60	0.25	-1 	.1074	.0018	4.70	0.21	.3176	.0132	.925	1778	64	1755	31	
521-39	0.40	225	57	0.26	-4 	.1073	.0014	4.86	0.21	.3282	.0136	.953	1830	66	1755	24	
521-40	0.45	176	62	0.37	-3 	.0998	.0017	4.06	0.18	.2954	.0124	.926	1669	61	1620	32	
521-41	0.92	197	82	0.43	11 	.0874	.0097	2.51	0.30	.2084	.0089	.361	1221	48	1369	213	
521-42	1.60	199	38	0.20	-12 	.0735	.0052	1.97	0.16	.1948	.0082	.514	1147	44	1028	143	
521-43	1.02	118	31	0.27	-2 	.1086	.0037	4.86	0.27	.3248	.0138	.781	1813	67	1775	62	
521-44	0.49	259	61	0.24	-5 	.0993	.0014	4.11	0.18	.3000	.0125	.948	1691	62	1612	26	
521-45	0.41	328	189	0.60	-5 	.1098	.0029	5.13	0.25	.3386	.0140	.847	1880	67	1796	47	
521-46	0.32	221	75	0.35	1 	.0960	.0029	3.57	0.18	.2698	.0112	.814	1540	57	1548	56	
																	
 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	
521-47	2.69	62	51	0.85	-30 	.0858	.0080	3.65	0.38	.3088	.0139	.433	1735	68	1335	181	
521-48	2.27	91	48	0.54	-9 	.0756	.0127	2.10	0.36	.2013	.0090	.257	1182	48	1083	337	
521-49	6.45	15	16	1.13	14 	.0982	.0288	3.21	0.96	.2373	.0143	.202	1372	75	1590	548	
521-50	0.80	198	103	0.54	-11 	.0837	.0042	2.85	0.19	.2468	.0104	.642	1422	54	1286	98	
521-51	0.75	2748	1948	0.73	10 	.0773	.0015	1.82	0.08	.1708	.0070	.906	1016	38	1129	38	
521-52	0.32	535	137	0.26	4 	.1104	.0008	4.72	0.20	.3099	.0127	.984	1740	63	1806	13	
521-53	0.84	184	139	0.78	-4 	.1055	.0022	4.64	0.22	.3191	.0134	.898	1785	65	1722	38	
521-54	1.36	138	66	0.49	5 	.1026	.0057	3.97	0.28	.2806	.0120	.608	1595	60	1672	103	
521-55	3.45	37	22	0.61	-25 	.0835	.0181	3.23	0.72	.2807	.0142	.227	1595	71	1280	423	
521-56	0.57	306	263	0.89	-10 	.0896	.0019	3.38	0.16	.2741	.0114	.892	1561	57	1416	40	
521-57	0.53	194	101	0.54	-3 	.0818	.0023	2.48	0.13	.2197	.0092	.832	1281	49	1240	55	
521-58	0.48	227	39	0.18	-5 	.1043	.0015	4.61	0.20	.3205	.0133	.945	1792	65	1702	26	
521-59	2.30	54	17	0.33	-3 	.0937	.0083	3.52	0.35	.2720	.0123	.455	1551	63	1503	168	
521-60	0.26	147	95	0.67	2 	.1046	.0019	4.27	0.20	.2959	.0125	.921	1671	62	1707	33	
521-61	7.51	20	8	0.41	-40 	.0734	.0357	2.52	1.24	.2491	.0147	.120	1434	76	1026	983	
521-62	1.03	49	27	0.56	10 	.1141	.0056	4.66	0.31	.2962	.0135	.679	1672	67	1866	89	
521-63	0.38	109	71	0.68	-7 	.1016	.0021	4.43	0.21	.3162	.0136	.898	1771	66	1654	39	
521-64	0.52	246	133	0.56	-3 	.0779	.0034	2.15	0.13	.2004	.0084	.697	1178	45	1145	86	
521-65	0.23	686	356	0.54	-3 	.0777	.0012	2.15	0.09	.2005	.0082	.939	1178	44	1140	30	
521-66	0.48	130	29	0.23	-7 	.1099	.0037	5.26	0.29	.3470	.0147	.781	1920	71	1797	62	
521-67	0.24	916	251	0.28	-1 	.0933	.0007	3.40	0.14	.2644	.0108	.984	1512	55	1495	14	
521-68	0.14	453	138	0.32	-4 	.1062	.0009	4.72	0.20	.3219	.0132	.981	1799	65	1736	15	
521-69	0.99	147	26	0.18	2 	.0761	.0054	1.90	0.16	.1814	.0077	.518	1075	42	1097	141	
																	
 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	
521-70	0.60	213	77	0.37	3 	.0809	.0028	2.25	0.12	.2015	.0084	.772	1184	45	1220	68	
521-71	1.19	85	21	0.25	-1 	.1141	.0043	5.35	0.31	.3399	.0147	.757	1886	71	1866	68	
521-72	0.90	125	149	1.23	7 	.0814	.0045	2.17	0.15	.1938	.0083	.614	1142	45	1231	108	
521-73	0.37	201	91	0.47	-1 	.1025	.0018	4.24	0.19	.3000	.0125	.920	1691	62	1669	33	
521-74	3.58	61	51	0.86	21 	.0859	.0106	2.12	0.28	.1787	.0083	.351	1060	45	1337	238	
521-75	0.26	221	99	0.46	-2 	.1089	.0012	4.90	0.21	.3265	.0136	.967	1822	66	1780	20	
521-18A	7.75	20	3	0.14	-34 	.0798	.0215	3.11	0.85	.2822	.0128	.167	1603	64	1192	531	
521-18B	24.19	14	6	0.46	39 	.1054	.0721	2.55	1.76	.1755	.0143	.119	1042	79	1721	1257	
521-52A	0.43	481	86	0.18	-2 	.1083	.0015	4.84	0.14	.3238	.0085	.888	1808	41	1772	25	
521-28A	17.27	22	6	0.29	-216 	.0555	.0494	1.81	1.62	.2369	.0145	.069	1370	76	434	1983	
521-1A	1.59	130	90	0.71	2 	.1058	.0052	4.40	0.25	.3012	.0085	.503	1697	42	1729	89	
521-2A	1.58	210	99	0.48	-1 	.0961	.0076	3.66	0.31	.2759	.0078	.335	1571	39	1550	149	
521-32A	6.83	68	75	1.13	-16 	.0878	.0197	3.42	0.78	.2820	.0102	.158	1602	51	1379	432	

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.