Table 2. Analytical Results of 10Be Geochronology

Sample	Location, Latitude/Longitude	Altitude, m	Quartz,a g	Thickness, cm	Be Carrier,b g	10Be/9Be10-12	Measured 10Be,c 106 atoms (g SiO2)-1	10Be Model Age,d years
KF-031605-1	36degrees52.20/117degrees15.60	401	30.04	5	0.7684	1.8440 +/- 0.0292	1.379 +/- 0.022	219,400 +/- 3,500
KF-031605-2	36degrees52.58/117degrees15.75	393	30.04	5	0.7556	0.6673 +/- 0.0155	0.491 +/- 0.011	76,900 +/- 1,800
KF-031605-3	36degrees52.53/117degrees15.63	391	30	5	0.7288	1.1220 +/- 0.0221	0.797 +/- 0.016	124,000 +/- 2,400
KF-031605-4	36degrees52.57/117degrees15.59	398	30.03	5	0.877	0.4678 +/- 0.0178	0.399 +/- 0.015	62,500 +/- 2,400
KF-031605-5	36degrees52.55/117degrees15.51	399	30	5	0.7602	0.6047 +/- 0.0157	0.448 +/- 0.012	70,000 +/- 1,800
KF-031605-7	36degrees52.43/117degrees15.55	377	30.01	5	0.7626	0.5615 +/- 0.0231	0.417 +/- 0.017	65,200 +/- 2,700
KF-031605-8	36degrees52.37/117degrees15.50	372	30.03	5	0.7605	0.6112 +/- 0.0216	0.453 +/- 0.016	70,800 +/- 2,500
KF-031605-9	36degrees52.33/117degrees15.36	371	30.05	5	0.7621	0.7415 +/- 0.0209	0.550 +/- 0.015	86,400 +/- 2,400
KF-031605-10	36degrees52.27/117degrees15.34	361	30.05	5	0.7586	0.6057 +/- 0.0181	0.447 +/- 0.013	69,900 +/- 2,100
KF-RWC-03	36degrees52.20/117degrees15.20	355	30.04	5	0.7615	0.5990 +/- 0.0179	0.444 +/- 0.013	69,400 +/- 2,100
Q2C-1	36degrees54.49/117degrees17.39	500	15.29	5	0.992	0.2837 +/- 0.0921	0.538 +/- 0.017	72,100 +/- 2,300
Q2C-2	36degrees54.50/117degrees17.39	500	15.3855	5	0.9886	0.2224 +/- 0.0817	0.418 +/- 0.015	55,700 +/- 2,000
Q2C-3	36degrees54.48/117degrees17.37	500	15.3095	5	0.984	0.3235 +/- 0.0101	0.608 +/- 0.019	81,900 +/- 2,500
Q2C-4	36degrees54.48/117degrees17.35	500	15.3363	5	0.9965	0.2549 +/- 0.0984	0.484 +/- 0.019	64,800 +/- 2,500
Q2C-5	36degrees54.46/117degrees17.37	500	15.2311	5	0.9933	0.2439 +/- 0.0827	0.465 +/- 0.016	62,300 +/- 2,100
Q2C-6	36degrees54.48/117degrees17.33	500	14.9566	5	0.9899	0.1416 +/- 0.0219	0.274 +/- 0.042	36,500 +/- 5,600

aA density of 2.7 g cm-3 was used for the quartzite surface samples.
bBe carrier concentration is 437 mug mL-1.
cPropagated uncertainties include error in the blank, carrier, and counting statistics.
dPropagated error in the model ages include a 6% uncertainty in the production rate of 10Be and 3% uncertainty in the 10Be decay constant.