Figure DR1

DR2007103

Figure DR2

DR2007103

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Quartz arenite Feldspathic sandstone

UMG3-1 1117.4 7.4 1114.9 7.8 1116.4 7.8 1170 23 UMG4-1 1023.2 14.0 1022.7 14.7 1022.2 15.3 1033 33

UMG3-2 1192.3 8.3 1188.7 8.7 1188.6 8.7 1257 31 UMG4-2 1554.8 18.7 1548.6 20.7 1547.2 21.2 1614 22

UMG3-3 1025.1 5.8 1022.6 6.1 1024.7 6.0 1085 22 UMG4-3 1470.4 20.8 1470.7 22.8 1469.5 22.1 1467 30

UMG3-4 1828.1 12.5 1821.0 14.3 1823.3 13.4 1881 16 UMG4-4 1819.9 25.6 1814.1 29.5 1820.2 26.5 1858 26

UMG3-5 1873.3 10.1 1869.3 11.6 1872.8 11.3 1902 13 UMG4-5 1469.1 9.8 1468.2 10.8 1468.9 11.7 1479 19

UMG3-6 1141.1 7.8 1138.6 8.2 1140.6 8.1 1193 23 UMG4-6 2261.5 9.1 2156.9 21.3 2267.6 9.7 2598 7

UMG3-7 1042.5 13.2 1046.4 13.8 1044.2 14.5 946 74 UMG4-7 2598.1 21.0 2548.7 32.2 2597.0 24.2 2699 13

UMG3-8 1085.5 17.2 1077.8 17.3 1078.0 18.2 1248 118 UMG4-8 1031.3 13.8 1023.8 14.5 1026.9 14.9 1185 46

UMG3-9 2505.4 10.5 2463.3 15.7 2498.7 11.6 2621 7 UMG4-9 2695.7 28.2 2658.1 44.6 2697.0 33.7 2761 16

UMG3-10 1895.0 31.6 1909.3 36.9 1897.8 36.0 1793 32 UMG4-10 1750.7 13.3 1748.3 15.3 1750.6 13.7 1769 19

UMG3-11 895.1 7.8 887.9 8.1 894.8 8.1 1101 46 UMG4-11 1096.4 5.6 1092.1 6.0 1102.4 5.9 1179 20

UMG3-12 1049.7 8.1 1046.7 8.5 1046.4 8.6 1117 27 UMG4-12 1056.2 11.3 1051.1 11.9 1057.8 11.9 1159 43

UMG3-13 1799.0 17.4 1788.5 19.7 1796.8 18.7 1879 22 UMG4-13 1015.5 12.4 1011.2 13.1 1010.4 13.2 1109 44

UMG3-14 1159.7 37.3 1155.5 39.0 1159.2 37.6 1241 20 UMG4-14 1215.4 6.0 1206.2 6.5 1205.0 6.4 1358 16

UMG3-15 1080.2 35.6 1074.3 37.0 1080.1 37.6 1205 26 UMG4-15 1041.8 3.9 1040.9 4.1 1041.8 4.1 1061 14

UMG3-16 991.0 32.7 993.7 34.1 990.6 35.3 921 34 UMG4-16 1080.6 15.9 1087.3 16.5 1085.7 17.3 941 107

UMG3-17 987.8 33.3 982.3 34.4 985.6 35.5 1124 37 UMG4-17 1147.3 8.4 1144.6 8.9 1146.7 8.7 1195 25

UMG3-18 1270.1 40.3 1267.5 42.7 1265.7 44.0 1312 16 UMG4-18 1300.6 16.0 1300.4 17.3 1300.3 16.8 1304 33

UMG3-19 1017.8 34.1 1014.4 35.4 1017.1 38.3 1098 37 UMG4-19 943.8 8.0 942.0 8.4 941.9 8.5 988 33

UMG3-20 1016.3 33.4 1014.2 34.7 1015.9 34.0 1067 30 UMG4-19 1437.0 12.5 1442.2 13.8 1434.8 13.2 1375 28

UMG3-21 1194.1 38.4 1197.0 40.6 1194.2 40.3 1138 25 UMG4-21 1148.5 24.2 1143.8 25.8 1146.9 25.6 1230 81

UMG3-22 987.3 32.4 987.3 33.7 986.6 34.3 988 27 UMG4-22 1059.2 6.6 1056.7 6.9 1057.1 7.5 1112 24

UMG3-23 1502.2 47.9 1507.4 52.1 1502.2 49.5 1439 30 UMG4-23 1345.3 18.6 1324.9 20.1 1332.1 22.0 1596 39

UMG3-24 982.7 33.4 977.1 34.6 981.4 36.5 1123 56 UMG4-24 1032.8 6.6 1033.2 6.9 1033.3 6.9 1025 29

UMG3-25 1727.2 55.4 1741.2 62.5 1725.7 65.2 1601 46 UMG4-25 2824.1 22.0 2796.5 38.5 2823.0 24.2 2862 11

UMG3-26 1588.4 49.5 1583.1 54.1 1586.9 52.7 1642 17 UMG4-26 1046.2 7.2 1045.0 7.7 1045.1 7.5 1073 25

UMG3-27 1047.1 34.5 1048.5 36.1 1047.2 35.7 1013 31 UMG4-27 1893.5 7.9 1751.4 23.9 1865.2 11.0 2577 9

UMG3-28 1072.4 34.4 1073.7 35.9 1071.7 35.8 1042 15 UMG4-28 2445.5 20.1 2424.3 28.0 2442.2 22.2 2501 14

UMG3-29 994.7 32.1 992.8 33.3 993.9 33.2 1042 16 UMG4-29 1062.1 8.3 1064.4 8.9 1064.6 9.9 1013 29

UMG3-30 1994.3 61.0 2001.8 71.6 1994.3 63.1 1949 17 UMG4-30 1156.2 9.5 1154.5 10.2 1151.9 10.2 1186 28

Arkosic sandstone Arkosic sandstone

UMG2A-1 2489.1 26.9 2430.8 38.0 2488.8 29.5 2630 9 UMG1-1 2723.1 36.9 2760.9 62.7 2719.8 40.1 2659 16

UMG2A-2 1514.4 15.8 1395.6 24.4 1539.5 17.9 2415 14 UMG1-2 2910.5 55.5 2977.5 115.5 2927.3 58.4 2835 29

UMG2A-3 2611.6 30.5 2609.5 45.8 2606.0 40.5 2616 12 UMG1-3 1307.2 15.5 1147.4 26.9 1349.7 18.7 2679 14

UMG2A-4 2082.5 21.1 1971.0 30.7 2086.7 21.9 2529 9 UMG1-4 2660.9 36.2 2663.4 56.3 2661.2 39.0 2656 16

UMG2A-5 2818.3 35.3 2803.9 60.6 2813.4 37.9 2838 13 UMG1-5 2658.8 36.0 2630.6 54.8 2660.7 39.7 2711 17

UMG2A-6 2201.6 22.7 2081.1 34.3 2214.5 25.5 2614 13 UMG1-6 1885.3 27.5 1713.9 39.0 1977.0 32.4 2685 18

UMG2A-7 1722.1 17.6 1589.9 28.2 1734.7 18.3 2503 15 UMG1-7 2663.4 43.0 2664.4 66.6 2685.1 48.9 2662 28

UMG2A-8 2692.6 32.8 2689.5 51.7 2689.8 34.6 2698 13 UMG1-8 2269.9 24.2 2130.7 37.1 2295.7 25.4 2699 8

UMG2A-9 2072.8 23.3 1941.3 33.9 2118.2 25.8 2594 12 UMG1-9 2206.1 31.9 2059.9 44.1 2215.6 34.7 2691 60

UMG2A-10 2276.9 23.0 2170.0 33.9 2286.4 24.6 2613 8 UMG1-10 1989.5 23.1 1823.9 36.0 2042.1 25.8 2684 11

UMG2A-11 1969.3 21.3 1830.7 32.8 1959.5 28.4 2584 13 UMG1-11 1253.1 16.4 1103.1 26.0 1324.8 19.9 2642 19

UMG2A-12 2484.2 31.2 2422.7 43.9 2452.6 37.9 2634 18 UMG1-12 1723.5 22.4 1569.3 32.6 1760.5 26.7 2600 18

UMG2A-13 1842.4 19.0 1700.1 31.0 1870.6 21.2 2567 13 UMG1-13 2356.6 28.5 2232.7 41.7 2373.4 31.7 2702 14

UMG2A-14 1850.3 19.2 1710.5 30.6 1879.8 21.2 2558 12 UMG1-14 1726.4 19.5 1555.0 32.9 1744.9 20.7 2672 13

UMG2A-15 2421.0 24.3 2347.3 34.4 2426.8 24.7 2616 7 UMG1-15 2652.7 30.5 2647.7 46.8 2656.6 35.3 2662 11

UMG2A-16 1042.4 13.4 1039.7 14.0 1041.5 14.5 1100 28 UMG1-16 2597.0 37.6 2557.7 55.2 2601.5 41.3 2678 19

UMG2A-17 1606.4 17.2 1455.1 30.1 1595.8 22.8 2583 20 UMG1-17 2601.1 32.8 2574.0 48.3 2598.4 39.2 2657 14

UMG2A-18 2279.2 23.1 2167.7 34.7 2312.9 26.1 2627 9 UMG1-18 2599.0 40.8 2555.9 59.8 2601.6 49.2 2687 20

UMG2A-19 2197.0 22.5 2071.6 34.0 2196.8 25.2 2626 7 UMG1-19 1694.0 20.3 1516.7 33.1 1678.2 21.9 2696 12

UMG2A-20 2598.3 39.0 2594.1 57.0 2603.2 43.5 2607 39 UMG1-20 2581.4 29.2 2451.9 46.6 2593.6 31.6 2843 10

UMG2A-21 2113.2 21.5 1976.5 33.4 2114.8 22.9 2626 9 UMG1-21 2629.9 39.3 2602.0 58.8 2628.6 41.6 2684 18

UMG2A-22 2111.3 23.2 1983.0 33.9 2119.0 27.3 2598 11 UMG1-22 2618.8 29.4 2608.4 43.9 2612.0 33.0 2640 23

Analytical Notes

U-Pb measurements of zircons were made at the U.S.G.S.-Stanford Microanalytical Center using the SHRIMP RG ion microprobe (e.g., Compston et al, 1984 and Compston and Williams, 1992; Ludwig, 199a,b; Steiger and Jaeger, 1977).

Common Pb correcxtions were made using model Pb compositions (Stacey and Kramers, 1975)

All grains were imaged prior to analysis (CL in addition to reflected and transmitted light) and data are reported for “whole” grains only (no data are reported for overgrowths).

Ludwig, K., 1999a, Isoplot/ex version 2.00: A geochronological toolkit for Microsoft Excel. Berkeley Geochronology Center Special Publication No. 1, 46 p.

Ludwig, K., 1999b, Squid, version 1.02. Berkeley Geochronology Center Special Publication No. 2, 16 p.

Stacey, J. and Kramers, J., 1975, Approximation of terrestrial lead isotope evolution by a two stage model: Earth and Planetary Science Letters, v. 26, p. 381-399.Steiger, R. and Jager, E., 1977, Subcommission on geochronology: Convention on use of decay constants in geo- and cosmochronology: Earth and Planetary Science Letters, v. 36, p. 359-362.

Table DR1DR2007103

40Ar/39Ar dataData Power 36Ar (A) 37Ar (Ca) 39Ar (K) *40Ar 40Ar* 40Ar*/39Ar(K) Cumulative Calculated age Error in ageFile (Watts) Volts Volts Volts Volts % 39Ar (%) (Ma) (± 2s)

UMG2b total fusion2558 Fused 0.0005 0.0000 0.0367 5.8895 97.57 160.57 100.0 868.32 24.3

2560 Fused 0.0006 0.0000 0.0277 3.8203 95.62 137.72 100.0 767.50 35.1 2572 Fused 0.0004 0.0000 0.0166 2.7029 95.57 162.53 100.0 876.72 21.6 2573 Fused 0.0003 0.0000 0.0087 2.3834 96.31 273.70 100.0 1298.32 35.7 2574 Fused 0.0002 0.0000 0.0082 1.4496 95.93 177.39 100.0 939.11 30.9 2575 Fused 0.0000 0.0000 0.0205 2.6769 99.45 130.51 100.0 734.45 12.7 2577 Fused 0.0006 0.0000 0.0285 4.5178 96.33 158.76 100.0 860.52 17.4 2578 Fused 0.0007 0.0000 0.0238 3.6624 94.90 153.94 100.0 839.63 18.1 2590 Fused 0.0005 0.0000 0.0193 4.4293 96.77 229.16 100.0 1141.02 19.6 2592 Fused 0.0015 0.1939 0.0702 11.9947 96.40 170.96 100.0 912.39 28.6 2595 Fused 0.0004 0.0000 0.0205 2.6454 96.15 128.92 100.0 727.10 18.0 2596 Fused 0.0003 0.0000 0.0332 5.3599 98.33 161.67 100.0 873.05 16.7 2597 Fused 0.0007 0.0000 0.0365 4.8172 96.01 131.98 100.0 741.22 11.0 2599 Fused 0.0009 0.0000 0.0210 3.1198 92.27 148.49 100.0 815.73 21.2 3403 Fused 0.0002 0.0000 0.0107 1.5067 96.73 141.03 100.0 782.45 30.9 3408 Fused 0.0002 0.0000 0.0088 1.8570 96.61 211.65 100.0 1075.22 45.4 3409 Fused 0.0002 0.0000 0.0156 1.7467 97.33 112.00 100.0 646.77 20.0 3434 Fused 0.0001 0.0000 0.0083 1.7540 98.25 211.16 100.0 1073.37 224.1 3435 Fused 0.0001 0.0518 0.0036 0.6035 97.17 168.23 100.0 900.91 535.3

UMG2b step heat 3150-01 0.21 W 0.0001 0.0000 0.0092 1.4428 97.30 156.58 49.5 851.12 38.6 3151-02 Fused 0.0000 0.2067 0.0094 1.6979 99.21 180.53 50.5 952.02 87.3

TFA 902.8 ± 49.0 3188-01 0.11 W 0.0000 0.1117 0.0029 0.4313 99.76 146.46 46.2 806.70 76.9 3189-02 0.42 W 0.0000 0.1132 0.0023 0.3781 99.98 162.24 36.6 875.47 102.5 3190-03 Fused 0.0001 0.0000 0.0011 0.1377 86.45 125.09 17.3 709.22 244.9

TFA 815.9 ± 66.4 3430-01 0.11 W 0.0000 0.0000 0.0026 0.3930 99.98 152.95 61.4 835.30 338.3 3431-02 Fused 0.0000 0.0000 0.0016 0.1246 91.23 76.97 38.6 468.21 506.3

TFA 702.1 ± 274.7 3127-01 0.21 W 0.0000 0.0000 0.0224 8.4554 99.99 376.84 100.0 1617.24 24.2

Lost fusion step

UMG4 total fusion 3042 fused 0.0038 0.0000 0.0608 5.1453 81.99 84.58 100.0 508.54 11.4 3044 fused 0.0030 0.0000 0.0668 4.4748 83.42 67.03 100.0 414.19 50.6 3045 fused 0.0022 0.0000 0.0636 4.3942 86.98 69.10 100.0 425.54 20.5 3046 fused 0.0009 0.3645 0.0345 21.1393 98.78 613.17 100.0 2186.81 23.7 3048 fused 0.0028 0.0000 0.0610 23.2477 96.51 380.83 100.0 1628.51 38.53050 fused 0.0010 0.0000 0.0222 1.1709 79.43 52.86 100.0 334.19 12.13069 fused 0.0000 0.6654 0.0130 7.3244 100.00 564.72 100.0 2083.78 161.13072 fused 0.0004 0.0000 0.0255 9.8021 98.88 384.72 100.0 1639.43 16.13074 fused 0.0016 0.0000 0.0230 1.7350 78.21 75.37 100.0 459.66 20.63097 fused 0.0000 0.0000 0.0221 8.7742 99.97 397.48 100.0 1674.78 30.63098 fused 0.0003 0.1225 0.0189 14.1313 99.31 748.98 100.0 2447.70 32.23099 fused 0.0001 0.0185 0.0125 4.9928 99.42 400.26 100.0 1682.41 35.23099 fused 0.0001 0.0000 0.0124 5.0119 99.63 403.88 100.0 1692.28 34.03100 fused 0.0008 0.1642 0.0386 14.5374 98.45 376.15 100.0 1615.27 22.33059 fused 0.0007 0.0000 0.0452 9.9914 98.06 220.96 100.0 1110.51 28.83062 fused 0.0032 0.0000 0.0500 3.4605 78.57 69.27 100.0 426.51 30.33063 fused 0.0011 0.0000 0.0469 3.7206 91.89 79.39 100.0 481.13 25.0

Table DR2DR2007103

3108-003 Fused 0.0000 0.0000 0.0003 0.2889 96.04 1095.28 1.1 2980.13 5988.6TFA 1762.4 ± 88.3

3412-001 0.21 W 0.0000 0.0000 0.0097 3.8880 99.99 399.88 98.3 1681.36 50.3 3413-001 0.42 W 0.0000 3.0218 0.0000 0.2381 100.00 0.00 0.0 0.00 0.0 3414-003 fused 0.0000 0.0000 0.0002 0.0749 97.15 458.14 1.7 1834.06 2751.4

TFA 1748.6 ± 69.2 3437-001 0.11 W 0.0000 0.0000 0.0018 0.8404 99.51 455.73 27.2 1827.99 686.4 3438-002 fuse 0.0001 0.0000 0.0049 3.3691 99.38 681.28 72.8 2322.36 306.1

TFA 2200.9 ± 298.1 3441-001 0.11 W 0.0004 0.0000 0.0055 0.3470 73.82 63.05 63.7 392.04 141.5 3442-002 fused 0.0001 0.0000 0.0031 0.1268 83.06 40.40 36.3 260.78 190.3

TFA 345.5 ± 113.2

Notes:Sample irradiation at the Oregon State Reactor FacilitySingle mica grains degassed using a CO2 laser, gas extraction into a stainless steel line and cleaned using two GP-50 SAES gettersArgon gas was analyzed using a MAP 215-50 mass spectrometer in multiplyer modeAges calulcated using GA1550 biotite with an age of 98.79 ± 0.96 Ma, and 40K decay constant of 5.543E-10 y-1Correction factors for interfering neutron reactions were determined by analyzing K-glass and optical grade CaF2:

(40Ar/39Ar)K = 2.66 x 10-2, (36Ar/37Ar)Ca = 2.70 x 10-4, and (39Ar/37Ar)Ca = 6.76 x 10-4

Data corrected for line blanks and mass spectrometer discriminationErrors in summary age information at 2-sigma

Table DR2DR2007103

Hf isotopic data for Uinta Mountain Group zircons (see Table footnote for analytical methods and constants).176Hf/177Hf 2 S.E. εHf (present) 176Lu/177Hf 176Hf/177Hf εHf (@1.1Ga)

UMG-30.282207 0.000020 -22.5 0.0006 0.282195 2.20.282231 0.000019 -21.6 0.0008 0.282214 2.90.282197 0.000018 -22.8 0.0005 0.282187 1.90.282237 0.000019 -26.5 0.0012 0.282218 3.00.282186 0.000020 -21.4 0.0009 0.282173 1.40.282212 0.000034 -23.2 0.0006 0.282193 2.10.282146 0.000034 -22.9 0.0009 0.282135 0.00.282220 0.000024 -25.2 0.0005 0.282207 2.60.282221 0.000019 -22.6 0.0006 0.282192 2.10.282127 0.000012 -22.6 0.0014 0.282118 -0.60.282246 0.000027 -25.9 0.0005 0.282236 3.60.282240 0.000011 -21.7 0.0005 0.282200 2.40.282225 0.000020 -21.9 0.0019 0.282214 2.90.282292 0.000023 -22.4 0.0005 0.282269 4.80.282091 0.000019 -20.1 0.0011 0.282085 -1.70.282139 0.000015 -27.2 0.0003 0.282125 -0.30.282171 0.000014 -25.5 0.0007 0.282158 0.90.282212 0.000016 -24.4 0.0006 0.282199 2.3

UMG-40.282193 0.000031 -23.6 0.0019 0.282154 0.70.282189 0.000012 -23.7 0.0007 0.282175 1.50.282287 0.000240 -20.3 0.0021 0.282244 3.90.282178 0.000016 -24.1 0.0012 0.282154 0.70.282184 0.000016 -23.9 0.0005 0.282174 1.50.282146 0.000014 -25.2 0.0014 0.282116 -0.60.282220 0.000017 -22.6 0.0006 0.282207 2.60.282168 0.000018 -24.5 0.0006 0.282156 0.80.282073 0.000033 -27.8 0.0006 0.282061 -2.60.282118 0.000024 -26.2 0.0009 0.282100 -1.20.282138 0.000015 -25.5 0.0009 0.282119 -0.50.282338 0.000016 -18.5 0.0007 0.282324 6.70.282165 0.000011 -24.6 0.0057 0.282046 -3.10.282208 0.000018 -23.1 0.0015 0.282176 1.50.282192 0.000022 -23.6 0.0009 0.282174 1.40.282209 0.000018 -23.0 0.0005 0.282199 2.30.282112 0.000012 -26.4 0.0006 0.282099 -1.2

Procedure and constants used for Hf isotopic measurementsNu-Plasma MC-ICP-MS and New Wave 213 nm laser were used for the laser ablation experiments. The analyses were performed on spots and raster lines with 50 to 60 microns beam size, 8 to 10Hz, and 70% power. The analyses were performed with on-line Lu and Yb isobaric interference corrections, using 176Lu/175Lu=0.02653 and 176Yb/172Yb=0.5870,

both ratios within the range of published values (Vervoort et al., 2004). All isotopic ratios were corrected for mass-bias using 178Hf/177Hf=1.46718. Multiple analyses of FC-1 zircon standard performed during the sample analyzes yielded 176Hf/177Hf=0.282168 (+/-0.000016, 2 s.e.; n=24),

indistinguishable from multi-grain dissolution analyses of this standard (176Hf/177Hf=0.282174; +/-0.000013, 2 s.e.) and recently published data by Woodhead and Hergt, (2005).

Measured and mass-bias corrected 176Lu/177Hf ratios were used to calculate initial 176Hf/177Hf ratios, following Griffin et al., 2002. DM and CHUR from Nowell et al., 1998 and Patchett et al, 2004.

The Low Lu/Hf ratios yieled differences between the present-day measured and calculated initial 176Hf/177Hf ratios in most cases were less than 1 epsilon unit, 176Lu decay (1.867x10E-11) constant from Soderlund et al., 2004.

References:Griffin, W.L., Wang, X., Jackson, S.E., Pearson, N.J., O’RReilly, S.Y., Xu, X., and Zhou, X., 2002, Zircon chemistry and magma mixing, SE China:

In situ analysis of Hf isotopes, Tonglu and Pingtam igneous complexes. Lithos, 2002, 237-269.Nowell, G.M., Kempton, P.D., Noble, S.R., Fitton, J.G., Saunders, A.D., Mahoney, J.J., and Taylor, R.N., 1998, High-precision Hf isotopic measurements

of MORB and OIB by thermal ionization mass-spectrometry: insights into the depleted mantle. Chem. Geol., 149, 211-233.Patchett, P.J., Vervoort, J.D., Soderlund, U., and Salters, V.J.M., 2004, Lu-Hf and Sm-Nd isotopic systematics in chondrites and their

constraints on the Lu-Hf properties of the Earth. Earth Planet. Sci. Lett., 222, 29-41.Soderlund, U., Patchett, P. J., Vervoort, J. D., Isachsen, C.E., 2004, The 176Lu decay constant determined by Lu-Hf and U-Pb isotope

systematics of Precambrian mafic intrusions. Earth Planet. Sci. Lett. 219, p.311-324. Vervoort, J.D., Patchett, P.J., Soderlund, U., and Baker, M., 2004, Isotopic composition of Yb and the determination of Lu concentrations and

Lu/Hf ratios by isotope dilution using MC-ICPMS. Geochemistry, Geophysics, Geosystems, doi:10.1029/2004GC000721.Woodhead, J.D. and Hergt J.M. 2005, A preliminary appraisal of seven natural zircon reference materials for in situ Hf isotope determination.

Geostandards and Geoanalytical Research, 29, 183-195.

Table DR3DR2007103