Exposure Ages - Reedy Glacier
Sample Latitude Longitude Altitude Scaling1 Scaling1 Thickness Horizon Be-10 prod'n rate2 [Be-10]3 Exposure age4 Internal error [Al] qtz
(deg S) (deg W) (m) (spallation) (muons) correction correction (atom/g/yr) (E+4 atom/g) (kyr) (kyr) (ppm)
Quartz Hills
Reedy 3 limit (glacial maximum deposits; W to E)
03-RDY-005-QZH 85.90023 132.78708 1403 4.570 2.202 0.970 0.989 21.9 ± 1.3 71.8 ± 1.5 33 ± 2.1 0.71 22.3 ± 0.8
03-RDY-007-QZH 85.90123 132.75317 1401 4.562 2.200 0.941 0.991 21.3 ± 1.3 30.3 ± 0.7 14.3 ± 0.9 0.33 76.1 ± 0.5
03-RDY-008-QZH 85.90123 132.75317 1400 4.558 2.199 0.945 0.991 21.4 ± 1.3 123.7 ± 2.4 58.7 ± 3.7 1.2 70.9 ± 0.6
03-RDY-009-QZH 85.90322 132.69650 1363 4.424 2.162 0.929 0.983 20.2 ± 1.2 31.9 ± 0.7 15.8 ± 1 0.37 152.8 ± 2.4
03-RDY-021-QZH 85.90260 132.69640 1353 4.387 2.153 0.949 0.963 20.1 ± 1.2 68.8 ± 1.9 34.6 ± 2.3 0.97 225.2 ± 1.7
03-RDY-019-QZH 85.90360 132.68273 1359 4.408 2.158 0.929 0.990 20.3 ± 1.2 33.7 ± 1 16.7 ± 1.1 0.5 33.9 ± 0.5
03-RDY-024-QZH 85.90448 132.54638 1391 4.525 2.190 0.933 0.999 21.1 ± 1.3 36.3 ± 0.9 17.3 ± 1.1 0.41 49.2 ± 0.4
03-RDY-025-QZH 85.90448 132.54638 1391 4.525 2.190 0.949 0.999 21.5 ± 1.3 115.4 ± 2.2 54.4 ± 3.4 1.1 26.9 ± 0.2
03-RDY-026-QZH 85.90453 132.51820 1392 4.529 2.191 0.953 0.999 21.6 ± 1.3 130.1 ± 1.9 61.1 ± 3.8 0.89 35.6 ± 0.9
03-RDY-027-QZH 85.90453 132.49523 1399 4.553 2.197 0.937 0.989 21.1 ± 1.3 32.8 ± 0.8 15.6 ± 1 0.36 50.5 ± 2.5
03-RDY-077-QZH 85.90452 132.49380 1390 4.523 2.189 0.957 0.989 21.4 ± 1.3 35.3 ± 0.7 16.5 ± 1 0.35 256.9 ± 3.4
03-RDY-028-QZH 85.90452 132.49345 1394 4.537 2.193 0.943 0.962 20.6 ± 1.2 195.1 ± 2.7 96.9 ± 6 1.4 56.9 ± 1.2
Recessional deposits below Quartz Hills bench (by altitude)
03-RDY-056-QZH 85.89955 132.57832 1310 4.235 2.111 0.945 0.999 20 ± 1.2 26.6 ± 0.8 13.3 ± 0.9 0.43 83.8 ± 1.5
03-RDY-057-QZH 85.89955 132.57832 1310 4.235 2.111 0.941 0.999 19.9 ± 1.2 17.9 ± 1.4 9.01 ± 0.88 0.7 27.1 ± 3.3
03-RDY-058-QZH 85.89955 132.57832 1310 4.235 2.111 0.925 0.999 19.6 ± 1.2 19.3 ± 0.5 9.86 ± 0.63 0.23 36.5 ± 0.5
03-RDY-055-QZH 85.89935 132.58710 1309 4.233 2.110 0.921 0.999 19.5 ± 1.2 26.4 ± 0.6 13.6 ± 0.9 0.32 54.4 ± 0.1
03-RDY-048-QZH 85.89832 132.59722 1302 4.210 2.104 0.974 0.999 20.5 ± 1.2 16.7 ± 0.4 8.18 ± 0.52 0.19 63.9 ± 0.8
03-RDY-045-QZH 85.89838 132.59863 1296 4.188 2.098 0.957 0.998 20 ± 1.2 20.2 ± 0.5 10.1 ± 0.6 0.24 37.6 ± 0.7
03-RDY-046-QZH 85.89838 132.59863 1296 4.188 2.098 0.949 0.999 19.9 ± 1.2 28.8 ± 0.5 14.5 ± 0.9 0.28 76.7 ± 0.7
03-RDY-053-QZH 85.89878 132.59013 1294 4.180 2.096 0.941 0.998 19.7 ± 1.2 479.9 ± 7.9 259 ± 16.9 4.6 73 ± 0.2
03-RDY-050-QZH 85.89867 132.58910 1293 4.178 2.095 0.949 0.998 19.8 ± 1.2 70.2 ± 1.2 35.7 ± 2.2 0.62 139.2 ± 0.8
03-RDY-052-QZH 85.89867 132.58910 1293 4.178 2.095 0.941 0.998 19.6 ± 1.2 20.8 ± 0.6 10.6 ± 0.7 0.3 57.8 ± 0.7
03-RDY-033-QZH 85.89733 132.60530 1290 4.169 2.093 0.974 0.998 20.3 ± 1.2 19.5 ± 0.5 9.63 ± 0.62 0.23 29.5 ± 0.5
03-RDY-036-QZH 85.89753 132.60825 1282 4.140 2.085 0.949 0.998 19.6 ± 1.2 100.3 ± 1.9 51.7 ± 3.3 1 54.4 ± 1.7
03-RDY-037-QZH 85.89753 132.60825 1282 4.140 2.085 0.957 0.998 19.8 ± 1.2 15.1 ± 0.4 7.63 ± 0.49 0.19 258.7 ± 2.4
03-RDY-032-QZH 85.89758 132.61042 1280 4.133 2.083 0.933 0.998 19.3 ± 1.1 28.9 ± 0.7 15.1 ± 1 0.35 22.4 ± 2
03-RDY-030-QZH 85.89788 132.61377 1280 4.132 2.082 0.933 0.998 19.3 ± 1.1 23.5 ± 0.6 12.2 ± 0.8 0.29 47.8 ± 1
03-RDY-029-QZH 85.89803 132.61128 1276 4.120 2.079 0.961 0.997 19.8 ± 1.2 16 ± 0.9 8.11 ± 0.67 0.47 32.8 ± 0.6
03-RDY-038-QZH 85.89690 132.62010 1272 4.107 2.075 0.945 0.998 19.4 ± 1.1 13.8 ± 0.8 7.11 ± 0.59 43.5 ± 0.3
03-RDY-041-QZH 85.89717 132.61902 1266 4.087 2.070 0.953 0.998 19.5 ± 1.2 493 ± 8.8 269.4 ± 17.8 5.1 25.7 ± 0.5
03-RDY-042-QZH 85.89627 132.63007 1246 4.019 2.051 0.953 0.998 19.1 ± 1.1 17.4 ± 1.3 9.1 ± 0.86 0.68 37 ± 0.7
03-RDY-043-QZH 85.89627 132.63007 1246 4.019 2.051 0.949 0.998 19.1 ± 1.1 19.9 ± 1.1 10.5 ± 0.8 0.56 94.6 ± 0.4
Recessional deposits on bluff overlooking glacier (by altitude)
04-RDY-105-QZHL 85.91008 132.34532 1310 4.236 2.111 0.941 0.908 18.1 ± 1.1 21.7 ± 0.8 12 ± 0.9 0.47 75.3 ± 0.3
04-RDY-102-QZHL 85.90997 132.34222 1284 4.147 2.087 0.929 0.808 15.6 ± 0.9 67.1 ± 1.7 43.5 ± 2.8 1.1 72.9 ± 1
04-RDY-103-QZHL 85.90997 132.34222 1284 4.147 2.087 0.929 0.791 15.3 ± 0.9 27.2 ± 1 17.9 ± 1.3 0.69 22.9 ± 0.4
Reedy 1 and older deposits
03-RDY-011-QZH 85.92895 132.51148 1739 5.942 2.550 0.978 0.997 28.9 ± 1.7 5512 ± 42 4593 ± 951 122 62.1 ± 2.3
03-RDY-012-QZH 85.92906 132.50626 1743 5.962 2.555 0.965 0.997 28.7 ± 1.7 4181 ± 44 2428 ± 270 47 55.7 ± 3.9
03-RDY-013-QZH 85.92905 132.50617 1743 5.960 2.555 0.982 0.997 29.2 ± 1.7 3649 ± 44 1869 ± 180 36 67.3 ± 30.4
03-RDY-016-QZH 85.92905 132.50617 1742 5.955 2.553 0.952 0.997 28.2 ± 1.7 3955 ± 62 2254 ± 243 62 86.1 ± 2.6
03-RDY-069-QZH 85.93980 132.40382 1798 6.214 2.616 0.982 0.950 29 ± 1.7 4281 ± 56 2482 ± 282 61 74.6 ± 2.2
03-RDY-070-QZH 85.93795 132.40998 1784 6.148 2.600 0.982 0.959 28.9 ± 1.7 4617 ± 48 2890 ± 365 62 126.6 ± 1.4
03-RDY-072-QZH 85.93775 132.41812 1778 6.121 2.593 0.956 0.959 28.1 ± 1.7 4271 ± 48 2628 ± 309 57 457.2 ± 4.9
03-RDY-073-QZH 85.93812 132.42310 1778 6.121 2.593 0.978 0.959 28.7 ± 1.7 5630 ± 43 5131 ± 1256 162 115.2 ± 0.5
Caloplaca Hills
Reedy 3 limit (glacial maximum deposits; W to E)
03-RDY-117-CPH 86.08975 130.96432 1528 5.048 2.327 0.949 0.934 22.4 ± 1.3 24.1 ± 0.9 10.8 ± 0.8 0.4 315.7 ± 2.4
03-RDY-128-CPH 86.09003 130.96353 1529 5.052 2.328 0.945 0.942 22.5 ± 1.3 271.7 ± 4.4 124.2 ± 7.9 2.1 52.7 ± 0.9
03-RDY-127-CPH 86.08998 130.95963 1525 5.035 2.324 0.945 0.944 22.5 ± 1.3 34.7 ± 0.8 15.5 ± 1 0.36 59.6 ± 1.4
03-RDY-124-CPH 86.08908 130.93792 1516 4.999 2.314 0.949 0.949 22.5 ± 1.3 26.7 ± 0.6 11.9 ± 0.8 0.28 55.2 ± 0.9
03-RDY-121-CPH 86.08825 130.90778 1517 5.005 2.316 0.951 0.956 22.8 ± 1.3 105.2 ± 2 46.7 ± 2.9 0.91 54.9 ± 0.3
Polygon Spur area
Polygon Spur
Recessional deposits (by distance from glacier margin; farthest to closest)
04-RDY-154-PGN 86.01080 126.24662 1654 5.569 2.459 0.970 0.986 26.6 ± 1.6 56.1 ± 2.8 21.2 ± 1.7 1.1 46.1 ± 0.7
04-RDY-157-PGN 86.01013 126.24988 1660 5.595 2.465 0.957 0.987 26.4 ± 1.6 17.6 ± 1.6 6.69 ± 0.74 0.62 141.3 ± 9.7
04-RDY-159-PGN 86.01117 126.25185 1656 5.578 2.461 0.949 0.984 26 ± 1.5 119.8 ± 2.7 46.5 ± 3 1.1 168.6 ± 2.3
04-RDY-160-PGN 86.01145 126.25898 1657 5.582 2.462 0.953 0.967 25.7 ± 1.5 14.1 ± 0.8 5.5 ± 0.46 0.33 108.1 ± 0.4
Mim's Spur
Reedy 3 limit (glacial maximum deposits; approx. N to S along moraine)
04-RDY-168-MIM 86.04250 125.74313 1924 6.820 2.758 0.937 0.971 31 ± 1.8 28.2 ± 1.4 9.12 ± 0.7 0.44 94.4 ± 1.4
04-RDY-169-MIM 86.04247 125.74425 1923 6.815 2.757 0.970 0.949 31.3 ± 1.9 28.9 ± 1.3 9.23 ± 0.69 0.42 88.8 ± 1.4
04-RDY-170-MIM 86.04237 125.74607 1917 6.785 2.750 0.929 0.972 30.6 ± 1.8 28.6 ± 1.4 9.37 ± 0.73 0.47 100 ± 1
04-RDY-174-MIM-RPT 86.04386 125.70660 1988 7.145 2.832 0.970 0.971 33.6 ± 2 28.1 ± 0.7 8.38 ± 0.54 0.2 47.7 ± 2.3
04-RDY-178-MIM-RPT 86.04395 125.71752 1966 7.032 2.806 0.953 0.959 32.1 ± 1.9 25.7 ± 0.6 8.03 ± 0.52 0.2 61.2 ± 0.8
04-RDY-179-MIM 86.04405 125.71328 1970 7.052 2.811 0.953 0.964 32.4 ± 1.9 29.8 ± 0.9 9.22 ± 0.62 0.29 106.3 ± 0.9
Mim's Spur
Recessional deposits (by distance below Reedy 3 limit)
04-RDY-181-MIM 86.04250 125.75835 1895 6.676 2.724 0.921 0.996 30.6 ± 1.8 23.8 ± 0.7 7.78 ± 0.52 0.24 69.4 ± 1
04-RDY-183-MIM 86.04262 125.75902 1892 6.662 2.721 0.945 0.994 31.2 ± 1.9 52.2 ± 1.7 16.8 ± 1.1 0.53 71.2 ± 0.6
04-RDY-186-MIM 86.04400 125.80575 1826 6.344 2.646 0.961 0.991 30.2 ± 1.8 420.2 ± 18 143.8 ± 10.9 6.4 67.7 ± 0.4
Hatcher Bluffs
Reedy 3 limit (upper limit of deposit on N spur)
04-RDY-210-HCH 86.32798 126.08850 1956 6.981 2.795 0.983 0.989 33.9 ± 2 25 ± 1.2 7.39 ± 0.57 0.37 260 ± 2
04-RDY-211-HCH 86.32798 126.08850 1956 6.981 2.795 0.945 0.943 31.1 ± 1.8 11.3 ± 0.7 3.63 ± 0.32 0.23 59.6 ± 0.6
Recessional deposits below Reedy 3 limit
04-RDY-212-HCH 86.32785 126.13314 1943 6.915 2.780 0.976 0.994 33.5 ± 2 15.4 ± 1.5 4.61 ± 0.52 0.45 96 ± 0.8
Nunataks beside lower Reedy Glacier
Langford Peak
Summit erratics
04-RDY-074-LNG 85.54638 135.36480 1060 3.434 1.882 0.949 0.999 16.3 ± 1 12.2 ± 0.4 7.46 ± 0.49 0.22 44.5 ± 0.6
04-RDY-076-LNG 85.54642 135.37515 1050 3.405 1.873 0.957 0.981 16 ± 1 12.5 ± 0.3 7.8 ± 0.5 0.19 27 ± 0.5
Racine Nunatak
Recessional deposits (by altitude)
04-RDY-061-RCN 85.46152 136.24397 853 2.865 1.706 0.949 1.000 13.6 ± 0.8 9.9 ± 0.29 7.27 ± 0.48 0.21 56.7 ± 0.5
04-RDY-064-RCN 85.46327 136.23030 806 2.747 1.668 0.945 0.989 12.9 ± 0.8 8.4 ± 0.27 6.53 ± 0.44 0.21 47.7 ± 0.8
Pip's Peak
Recessional deposits (by altitude)
04-RDY-041-UNN 85.43522 135.93657 898 2.982 1.743 0.949 1.000 14.2 ± 0.8 10.6 ± 0.3 7.48 ± 0.48 0.18 37.7 ± 1.6
04-RDY-040-UNN 85.43520 135.93548 896 2.977 1.741 0.961 1.000 14.4 ± 0.9 10.1 ± 0.2 7.03 ± 0.45 0.17 42.7 ± 0.5
04-RDY-042-UNN 85.43533 135.94978 896 2.977 1.741 0.941 1.000 14 ± 0.8 10.2 ± 0.2 7.26 ± 0.46 0.17 41.6 ± 0.5
04-RDY-039-UNN 85.42880 135.88902 811 2.759 1.672 0.953 1.000 13.2 ± 0.8 8.92 ± 0.28 6.77 ± 0.45 0.21 62.4 ± 1.5
04-RDY-038-UNN 85.42870 135.88933 810 2.757 1.671 0.941 1.000 13 ± 0.8 8.79 ± 0.22 6.76 ± 0.44 0.17 23.6 ± 0.8
04-RDY-036-UNN 85.42590 135.88608 773 2.666 1.641 0.937 0.995 12.5 ± 0.7 8.56 ± 0.21 6.88 ± 0.44 0.17 74.1 ± 1
04-RDY-037-UNN 85.42660 135.88468 773 2.666 1.641 0.937 0.986 12.4 ± 0.7 4.89 ± 0.15 3.96 ± 0.26 0.12 69.4 ± 0.3
04-RDY-035-UNN 85.42443 135.88128 745 2.599 1.619 0.949 0.975 12.1 ± 0.7 0.63 ± 0.07 0.52 ± 0.07 0.06 28.1 ± 0.5
Cohen Nunatak
Recessional deposits (by altitude)
03-RDY-139-CHN 85.39980 136.22203 745 2.599 1.619 0.949 1.000 12.4 ± 0.7 8.54 ± 0.31 6.9 ± 0.48 0.25 50.4 ± 1.1
03-RDY-151-CHN 85.39982 136.21527 724 2.551 1.603 0.961 0.997 12.3 ± 0.7 8.24 ± 0.22 6.72 ± 0.44 0.18 68.2 ± 0.6
03-RDY-146-CHN 85.39970 136.19603 680 2.448 1.568 0.937 0.991 11.4 ± 0.7 5.68 ± 0.17 4.98 ± 0.33 0.15 64.8 ± 0.7
03-RDY-141-CHN 85.39973 136.18645 641 2.363 1.538 0.949 0.966 10.9 ± 0.6 1.63 ± 0.17 1.49 ± 0.18 0.16 52.6 ± 2.6
03-RDY-142-CHN 85.39973 136.18645 641 2.363 1.538 0.937 0.966 10.7 ± 0.6 1.89 ± 0.09 1.76 ± 0.13 0.08 58.8 ± 1.1
Outcrops in glacier shear margin (by altitude)
04-RDY-031-BRK 85.41232 135.84777 750 2.611 1.623 0.978 1.000 12.8 ± 0.8 0.75 ± 0.08 0.59 ± 0.07 0.06 59.8 ± 0.9
04-RDY-032-BRK 85.41232 135.84782 749 2.609 1.622 0.941 1.000 12.3 ± 0.7 0.83 ± 0.05 0.68 ± 0.06 0.04 52.9 ± 0
04-RDY-016-SKL 85.40540 135.91125 736 2.578 1.612 0.953 0.999 12.3 ± 0.7 4.56 ± 0.14 3.7 ± 0.25 0.11 36 ± 0.3
04-RDY-015-SKL 85.40537 135.91193 735 2.576 1.611 0.987 1.000 12.8 ± 0.8 4.66 ± 0.15 3.66 ± 0.25 0.12 37.3 ± 0.2
04-RDY-022-SKL-RPT 85.40572 135.86155 728 2.559 1.605 0.949 0.998 12.2 ± 0.7 1.01 ± 0.08 0.83 ± 0.08 0.06 164.3 ± 2
04-RDY-003-JGN 85.38615 136.27515 633 2.345 1.532 0.933 0.972 10.7 ± 0.6 0.57 ± 0.05 0.54 ± 0.06 0.05 74.6 ± 0.3
Drifting moraine below Cohen Ntk
04-RDY-068-DRM 85.38845 136.19483 637 2.354 1.535 0.949 0.989 11.1 ± 0.7 0.32 ± 0.05 0.28 ± 0.05 0.04 32.8 ± 0.5
04-RDY-070-DRM 85.39452 136.19140 631 2.341 1.531 0.945 0.986 11 ± 0.6 0.36 ± 0.05 0.33 ± 0.05 0.05 65.3 ± 0.7

1 Correction factor relative to 1013.25 mbar and latitude > 60¡, based on estimated mean annual air pressure, as described by Stone (2000).

2 Assumed 10Be production rates: spallation: 4.95 ± 0.30 atom/g SiO2/yr, negative muon capture: 0.11 ± 0.02 atom/g SiO2/yr, at 1013.25 mbar and latitude > 60¡ (Stone, 2000).

3 Measured relative to LLNL working 10Be/9Be standards.  Uncertainties propagated at ±1s level including all known sources of analytical error.

4 Calculated simple exposure ages.  If pre-exposed samples are old erratics that were overrun and buried during previous glaciations, these are lower limits to the cumulative exposure time.  Uncertainties are ±1s (68% confidence) including 10Be measurement uncertainties (see above) and assumed ±6% error in 10Be production rate.