Wishbone Hill, Sutton-Alpine, Alaska - AK166 Additional Site Information Riley E. Whitney, Alexander K. Stewart Notes: Samples taken from birch trees growing atop boulders in conjunction with landscape stability work Reference: Whitney, Riley E. and Stewart, Alexander K. 2019. BOULDER-TOP BIRCH TREES AS A MEANS OF DATING A ROCK FALL EVENT: WISHBONE HILL, SOUTHCENTRAL ALASKA. GSA Annual Meeting in Phoenix, Arizona, USA - 2019 COFECHA output: Chronology file name : AK166.CRN Measurement file name : AK166.RWL Date checked : 18JUL19 Checked by : B. Bauer Beginning year : 1938 Ending year : 2017 Principal investigators: Riley E. Whitney Alexander K. Stewart Site name : Wishbone Hill Site location : Alaska Species information : BEAK ALASKA PAPER BIRCH Latitude : 6144 Longitude : -14857 Elevation : 305M Series intercorrelation: 0.599 Avg mean sensitivity : 0.333 Avg standard deviation : 0.871 Avg autocorrelation : 0.715 Number dated series : 54 Segment length tested : 50 Number problem segments: 8 Pct problem segments : 6.61 PART 5: CORRELATION OF SERIES BY SEGMENTS: Wishbone Hill 10:12 Thu 18 Jul 2019 Page 5 ----------------------------------------------------------------------------------------------------------------------------------- Correlations of 50-year dated segments, lagged 25 years Flags: A = correlation under .3281 but highest as dated; B = correlation higher at other than dated position Seq Series Time_span 1925 1950 1975 1974 1999 2024 --- -------- --------- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- 1 WBH52a 1950 2017 .72 .69 2 WBH52b 1953 2017 .69 .71 3 WBH53a 1949 2017 .34 .36 .42 4 WBH54a 1950 2017 .75 .79 5 WBH54b 1955 2017 .84 .87 6 WBH55a 1974 2017 .60 7 WBH55b 1949 2017 .45 .58 .67 8 WBH56a 1950 2016 .44 .64 9 WBH56b 1950 2014 .41 .51 10 WBH57a 1965 2017 .37 .34 11 WBH58a 1950 2017 .73 .71 12 WBH58b 1951 2017 .66 .68 13 WBH59a 1949 2017 .63 .64 .75 14 WBH59b 1949 2017 .66 .66 .73 15 WBH60a 1975 2017 .56 16 WBH60b 1979 2017 .45 17 WBH61a 1953 2017 .44 .58 18 WBH61b 1959 2017 .52 .53 19 WBH62b 1965 2017 .55 .53 20 WBH63a 1951 2017 .78 .77 21 WBH63b 1955 2017 .79 .82 22 WBH64a 1941 2017 .22B .26B .39B 23 WBH64b 1938 2017 .39 .44 .70 24 WBH65a 1963 2017 .76 .76 25 WBH65b 1963 2017 .76 .76 26 WBH66a 1950 2017 .81 .82 27 WBH66b 1950 2017 .77 .81 28 WBH67a 1952 2017 .40 .35B 29 WBH68a 1945 2017 .77 .80 .82 30 WBH68b 1942 2017 .48 .79 .78 31 WBH69a 1948 2017 .45 .46 .62 32 WBH69b 1948 2017 .55 .55 .70 33 WBH70a 1953 2016 .40 .65 34 WBH70b 1967 2017 .61 .61 35 WBH71a 1959 2017 .27A .33B 36 WBH71b 1956 2017 .22A .32A 37 WBH72a 1950 2017 .55 .58 38 WBH72b 1950 2017 .62 .72 39 WBH73a 1949 2017 .72 .71 .73 40 WBH73b 1949 2017 .73 .72 .75 41 WBH74a 1944 2017 .75 .77 .81 42 WBH74b 1954 2017 .72 .81 43 WBH75a 1953 2017 .74 .76 44 WBH75b 1947 2017 .49 .46 .71 45 WBH76a 1955 2017 .80 .82 46 WBH76b 1955 2017 .83 .84 47 WBH77a 1950 2017 .75 .70 48 WBH77b 1952 2017 .52 .65 49 WBH78a 1949 2017 .43 .42 .47 50 WBH78b 1949 2017 .50 .47 .56 51 WBH79a 1954 2017 .57 .68 52 WBH79b 1954 2017 .47 .62 53 WBH80a 1953 2017 .74 .81 54 WBH80b 1956 2017 .72 .79 Av segment correlation .53 .60 .66 PART 7: DESCRIPTIVE STATISTICS: Wishbone Hill 10:12 Thu 18 Jul 2019 Page 9 ----------------------------------------------------------------------------------------------------------------------------------- Corr //-------- Unfiltered --------\\ //---- Filtered -----\\ No. No. No. with Mean Max Std Auto Mean Max Std Auto AR Seq Series Interval Years Segmt Flags Master msmt msmt dev corr sens value dev corr () --- -------- --------- ----- ----- ----- ------ ----- ----- ----- ----- ----- ----- ----- ----- -- 1 WBH52a 1950 2017 68 2 0 .683 1.29 3.88 1.000 .874 .346 2.48 .430 .036 1 2 WBH52b 1953 2017 65 2 0 .696 1.29 3.20 .869 .767 .383 2.49 .700 -.090 2 3 WBH53a 1949 2017 69 3 0 .351 .95 2.59 .462 .463 .436 2.67 .428 -.063 2 4 WBH54a 1950 2017 68 2 0 .719 2.19 5.05 1.305 .841 .285 2.59 .465 -.059 1 5 WBH54b 1955 2017 63 2 0 .848 2.54 6.06 1.752 .848 .299 2.68 .433 -.013 1 6 WBH55a 1974 2017 44 1 0 .603 2.36 4.40 1.029 .788 .242 2.74 .651 -.024 1 7 WBH55b 1949 2017 69 3 0 .512 1.87 5.13 1.263 .873 .336 2.84 .559 -.033 1 8 WBH56a 1950 2016 67 2 0 .520 1.12 2.17 .466 .566 .333 2.56 .530 -.019 2 9 WBH56b 1950 2014 65 2 0 .466 1.45 2.89 .636 .633 .336 2.56 .583 .021 1 10 WBH57a 1965 2017 53 2 0 .353 1.61 3.27 .654 .529 .345 2.60 .593 -.052 1 11 WBH58a 1950 2017 68 2 0 .686 1.82 4.77 1.198 .811 .335 2.74 .570 -.110 1 12 WBH58b 1951 2017 67 2 0 .649 1.49 4.21 1.081 .882 .301 2.53 .450 .015 1 13 WBH59a 1949 2017 69 3 0 .661 .93 2.04 .448 .565 .353 2.51 .541 -.007 1 14 WBH59b 1949 2017 69 3 0 .620 1.20 2.97 .592 .674 .328 2.66 .539 -.037 1 15 WBH60a 1975 2017 43 1 0 .556 2.26 3.95 .905 .772 .247 2.82 .566 .001 1 16 WBH60b 1979 2017 39 1 0 .452 2.00 4.07 .851 .811 .203 2.74 .576 -.025 1 17 WBH61a 1953 2017 65 2 0 .482 1.86 4.36 1.024 .735 .330 2.44 .416 -.032 1 18 WBH61b 1959 2017 59 2 0 .526 1.92 5.00 1.047 .754 .322 2.54 .482 -.083 1 19 WBH62b 1965 2017 53 2 0 .536 2.44 4.65 1.283 .918 .204 2.53 .539 .054 1 20 WBH63a 1951 2017 67 2 0 .766 2.09 4.64 1.077 .754 .302 2.51 .463 -.004 1 21 WBH63b 1955 2017 63 2 0 .783 1.73 4.02 1.005 .807 .301 2.55 .513 -.037 2 22 WBH64a 1941 2017 77 3 3 .354 1.80 3.32 .710 .692 .280 2.59 .542 -.030 1 23 WBH64b 1938 2017 80 3 0 .484 2.06 5.79 1.425 .879 .330 2.62 .442 -.041 1 24 WBH65a 1963 2017 55 2 0 .754 1.78 5.22 1.051 .747 .354 2.54 .442 .095 1 25 WBH65b 1963 2017 55 2 0 .750 1.93 5.52 1.386 .763 .405 2.61 .423 .058 1 26 WBH66a 1950 2017 68 2 0 .756 1.94 7.24 1.467 .778 .373 2.80 .499 .004 1 27 WBH66b 1950 2017 68 2 0 .779 2.03 5.52 1.228 .696 .370 2.61 .499 -.005 1 28 WBH67a 1952 2017 66 2 1 .385 .98 2.98 .516 .404 .425 2.65 .404 -.005 1 29 WBH68a 1945 2017 73 3 0 .762 1.47 3.42 .729 .630 .381 2.55 .514 -.002 1 30 WBH68b 1942 2017 76 3 0 .520 1.42 3.42 .862 .786 .335 2.53 .477 -.008 1 31 WBH69a 1948 2017 70 3 0 .514 1.07 2.42 .506 .634 .337 2.62 .528 -.085 1 32 WBH69b 1948 2017 70 3 0 .594 1.06 2.33 .477 .596 .341 2.73 .566 -.001 1 33 WBH70a 1953 2016 64 2 0 .439 1.56 3.14 .733 .593 .422 2.46 .496 -.107 3 34 WBH70b 1967 2017 51 2 0 .614 2.25 3.75 .775 .664 .247 2.48 .599 -.014 1 35 WBH71a 1959 2017 59 2 2 .281 1.51 3.33 .995 .910 .297 2.43 .357 -.080 1 36 WBH71b 1956 2017 62 2 2 .266 1.26 2.63 .688 .845 .276 2.45 .404 -.084 1 37 WBH72a 1950 2017 68 2 0 .491 1.21 3.32 .662 .715 .395 2.69 .599 -.064 1 38 WBH72b 1950 2017 68 2 0 .605 1.08 3.62 .828 .853 .382 2.84 .449 -.051 1 39 WBH73a 1949 2017 69 3 0 .703 1.53 2.86 .617 .638 .284 2.48 .367 -.017 1 40 WBH73b 1949 2017 69 3 0 .751 1.45 2.66 .671 .733 .339 2.45 .387 .081 1 41 WBH74a 1944 2017 74 3 0 .766 1.50 3.00 .746 .590 .392 2.59 .454 .009 1 42 WBH74b 1954 2017 64 2 0 .747 1.56 3.88 .691 .627 .330 2.59 .490 .029 1 43 WBH75a 1953 2017 65 2 0 .711 1.62 5.55 1.244 .877 .338 2.53 .394 -.022 1 44 WBH75b 1947 2017 71 3 0 .510 1.65 3.65 .942 .858 .305 2.32 .329 -.086 2 45 WBH76a 1955 2017 63 2 0 .786 1.83 4.59 1.030 .714 .334 2.53 .518 -.069 2 46 WBH76b 1955 2017 63 2 0 .829 1.72 4.01 .971 .714 .370 2.52 .467 -.071 2 47 WBH77a 1950 2017 68 2 0 .622 1.90 3.88 .885 .664 .327 2.46 .458 -.005 2 48 WBH77b 1952 2017 66 2 0 .533 1.45 6.31 1.067 .790 .324 2.71 .451 -.075 1 PART 7: DESCRIPTIVE STATISTICS: Wishbone Hill 10:12 Thu 18 Jul 2019 Page 10 ----------------------------------------------------------------------------------------------------------------------------------- Corr //-------- Unfiltered --------\\ //---- Filtered -----\\ No. No. No. with Mean Max Std Auto Mean Max Std Auto AR Seq Series Interval Years Segmt Flags Master msmt msmt dev corr sens value dev corr () --- -------- --------- ----- ----- ----- ------ ----- ----- ----- ----- ----- ----- ----- ----- -- 49 WBH78a 1949 2017 69 3 0 .409 1.16 2.62 .562 .704 .317 2.56 .441 -.016 1 50 WBH78b 1949 2017 69 3 0 .505 1.08 2.37 .524 .706 .324 2.62 .407 -.060 1 51 WBH79a 1954 2017 64 2 0 .608 1.21 2.46 .475 .490 .331 2.62 .604 .005 1 52 WBH79b 1954 2017 64 2 0 .500 1.27 2.36 .451 .287 .362 2.72 .610 -.033 1 53 WBH80a 1953 2017 65 2 0 .780 1.49 3.24 .758 .796 .297 2.65 .513 -.045 1 54 WBH80b 1956 2017 62 2 0 .713 1.28 3.89 .638 .659 .308 2.63 .570 -.001 1 --- -------- --------- ----- ----- ----- ------ ----- ----- ----- ----- ----- ----- ----- ----- -- Total or mean: 3488 121 8 .599 1.58 7.24 .871 .715 .333 2.84 .492 -.026