Data Repository Item													
TData Set S2. (U-Th)/He and U/Pb data for double-dated zircons from Blue Lead sand sample													
			(U-Th)/He data								U-Pb data		
Analysis	Ft	corr age	+/-	half-width	mass	U	Th	Th/U	U	Th	age	+/-	Th/U
		(Ma)		(mm)	(mg)	(ppm)	(ppm)		(ppm)	(ppm)	(Ma)		
													
BL-S1z14	0.885	74.5	1.5	94	43.0	344	144	0.43	444	230	88.5	0.8	0.52
BL-S1z18	0.871	106.3	2.2	78	37.1	163	47	0.29	153	31	147.0	2.4	0.20
BL-S1z30	0.765	113.7	2.3	39	8.1	237	53	0.23	157	28	148.4	1.6	0.18
BL-S1z47	0.869	94.4	1.9	75	35.8	426	166	0.40	332	116	109.0	1.1	0.35
BL-S1z48	0.767	98.2	2.1	53	2.9	270	205	0.78	205	82	1742.1	9.3	0.40
BL-S1z57	0.835	77.7	1.7	65	14.0	738	354	0.49	779	360	87.4	0.7	0.46
BL-S1z62	0.832	82.2	1.8	69	11.8	192	75	0.40	329	122	160.1	1.3	0.37
BL-S1z69	0.898	74.2	1.7	116	38.8	735	220	0.31	698	345	95.7	0.8	0.49
BL-S1z70	0.829	94.1	2.1	69	8.0	102	66	0.66	134	86	2499.5	10.1	0.64
BL-S1z78	0.845	99.9	2.2	65	18.7	185	61	0.34	117	36	159.2	2.0	0.30
BL-S1z100	0.822	85.4	1.8	58	12.2	269	124	0.47	104	29	110.7	1.9	0.28