North Atlantic Postglacial Deep Water Ventilation Sediment Data ----------------------------------------------------------------------- World Data Center for Paleoclimatology, Boulder and NOAA Paleoclimatology Program ----------------------------------------------------------------------- NOTE: PLEASE CITE CONTRIBUTORS WHEN USING THIS DATA!!!!! NAME OF DATA SET: North Atlantic Postglacial Deep Water Ventilation Sediment Data LAST UPDATE: 7/2006 (Original receipt by WDC Paleo) CONTRIBUTOR: Lloyd Keigwin, Woods Hole Oceanographic Institution IGBP PAGES/WDCA CONTRIBUTION SERIES NUMBER: 2006-068 SUGGESTED DATA CITATION: Keigwin, L.D. and M.A. Schlegel. 2006. North Atlantic Postglacial Deep Water Ventilation Sediment Data. IGBP PAGES/World Data Center for Paleoclimatology Data Contribution Series # 2006-068. NOAA/NCDC Paleoclimatology Program, Boulder CO, USA. ORIGINAL REFERENCE: Keigwin, L.D. and M.A. Schlegel. 2002. Ocean ventilation and sedimentation since the glacial maximum at 3 km in the western North Atlantic. Geochemistry, Geophysics, Geosystems, Vol. 3, No. 6, 1034, 22 June 2002. ABSTRACT: Stable isotope, sedimentological, and radiocarbon data from cores at ~3 km water depth on the Blake Ridge, western subtropical North Atlantic, reveal the history of deep water ventilation since the last glacial maximum (LGM). Bulk sediment accumulation rates varied locally by a factor of 2 under the influence of bottom currents in this sediment drift environment, but the sand flux, mostly foraminifera, was nearly identical at a given time. This suggests that the rain rate of foraminifera (mostly planktonic) was constant, that transport of foraminifera was negligible, and that current- controlled differences in clay and silt transport drive bulk accumulation. In two of the cores, flux peaks in the benthic foraminifera Cibicidoides and Uvigerina peregrina occurred during the Younger Dryas (YD) cold event, and at 18.2, 19.6, 21.1, 25.0, and 28.1 ka. Radiocarbon measurements on those benthic foraminifera show the ventilation age of bottom waters was ~1000 years during the YD, and for older events it was as great as 2000 years. These results contrast with Holocene ventilation, which was ~500 years and 700 years at 1500 years and ~7100 years before present, respectively. GEOGRAPHIC REGION: Western North Atlantic PERIOD OF RECORD: 20 - 1 KYrBP FUNDING SOURCE: National Science Foundation (USA) grants OCE-9510075 and ATM-9905550. DESCRIPTION: Stable isotope, sedimentological, and radiocarbon data from cores GGC39 and GGC40 on the Blake Ridge, western subtropical North Atlantic, interpreted as proxies for deep water ventilation since the last glacial maximum (LGM). Core 39JPC: 31° 40'N 75° 25'W Core 40GGC: 31° 43'N 75° 28'W DATA: 1. GGC39 Cibicidoides isotopes Column 1: Depth, midpoint (cm.) Column 2: Calendar Age (Years BP) Column 3: avg d13C Cibicidoides, per mil Column 4: avg d18O Cibicidoides, per mil Depth Age d13C d18O 7 1197 1.42 2.67 15 2294 1.07 2.58 27 3843 1.07 2.62 31 4334 1.26 2.63 35 4813 0.99 2.7 39 5279 1.22 2.56 43 5734 1.02 2.69 47 6176 1.23 2.63 51 6607 1.12 2.65 67 8218 1.31 2.47 71 8594 1.41 2.62 83 9656 1.34 2.78 87 9990 1.19 2.79 95 10628 1.2 2.79 99 10932 1.23 2.77 107 11513 1.03 2.39 111 11789 1.04 2.51 115 12057 1.02 2.73 117 12187 -0.13 2.86 119 12316 0.92 2.78 121 12442 0.7 2.89 123 12566 0.6 3 125 12688 1.07 3.43 127 12808 0.91 3.19 129 12925 0.84 2.92 131 13041 0.94 3.37 133 13155 0.83 3.05 135 13266 0.82 3.33 137 13376 1.01 3.33 139 13484 0.9 3.38 141 13589 0.92 3.41 143 13693 0.96 3.39 145 13795 0.94 3.65 147 13895 0.9 3.42 149 13993 0.94 3.63 154 14231 0.99 3.66 155 14277 0.96 3.52 157 14368 0.92 3.58 159 14457 1.1 3.51 161 14545 1.06 2.98 163 14631 0.98 3.47 165 14715 0.89 3.6 167 14797 0.85 3.35 169 14878 0.39 3.42 171 14957 0.87 3.3 175 15110 0.46 3.57 179 15258 0.6 2.94 183 15399 0.87 3.24 185 15467 0.73 3.46 195 15787 0.75 3.38 391 18530 0.32 4.43 2. GGC39 Ruber isotopes Column 1: Depth, midpoint (cm.) Column 2: Calendar Age (Years BP) Column 3: avg d13C G. ruber, per mil Column 4: avg d18O G. ruber, per mil Depth Age d18O d13C 7 1197 -1.067 0.486 11 1752 -1.179 0.883 15 2294 -1.201 0.536 19 2823 -1.394 0.718 23 3339 -1.172 0.506 27 3843 -1.214 0.684 31 4334 -0.996 0.564 35 4813 -1.317 0.599 39 5279 -1.136 0.789 43 5734 -1.424 0.772 47 6176 -1.233 0.713 51 6607 -1.409 0.587 55 7027 -1.332 0.715 59 7435 -1.229 0.203 63 7832 -1.59 0.178 67 8218 -1.316 0.76 71 8594 -1.329 0.287 75 8958 -0.994 0.76 79 9313 -1.295 0.393 83 9656 -1.073 0.754 87 9990 -0.973 0.88 91 10314 -1.053 0.526 95 10628 -0.923 0.527 99 10932 -0.958 0.329 103 11227 -0.997 0.513 107 11513 -1.044 0.323 111 11789 -0.939 0.181 115 12057 -0.949 0.481 117 12187 -0.932 119 12316 -0.895 0.288 121 12442 -0.76 123 12566 -0.697 0.492 125 12688 -0.616 127 12808 -0.458 0.187 129 12925 -0.509 131 13041 -0.45 0.26 133 13155 -0.508 135 13266 -0.891 137 13376 -0.874 -0.121 139 13484 -0.593 -0.159 141 13589 -0.539 143 13693 -0.4 0.087 145 13795 -0.68 -0.2 147 13895 -0.69 0.14 149 13993 -0.88 -0.33 154 14231 -0.6 -0.47 155 14277 -0.52 0.13 157 14368 -0.5 -0.33 159 14457 -0.85 0.22 161 14545 -0.95 -0.03 163 14631 -0.5 -0.025 165 14715 -0.37 -0.035 167 14797 -0.99 0.09 169 14878 -0.38 0.045 171 14957 -0.327 0.513 173 15034 -0.202 175 15110 0.091 0.091 177 15185 0.111 179 15258 -0.058 0.272 181 15329 -0.057 183 15399 -0.251 0.322 185 15467 -0.277 187 15534 -0.437 0.557 191 15663 -0.279 0.165 195 15787 -0.011 0.302 199 15906 -0.189 0.247 203 16019 0.069 0.26 207 16127 0.001 0.257 211 16230 0.06 0.441 215 16329 -0.139 0.232 217 16376 -0.044 0.422 223 16512 -0.368 0.479 227 16598 -0.344 0.231 231 16679 -0.54 0.199 235 16756 -0.424 0.255 239 16830 -0.332 0.201 243 16900 0.225 0.261 247 16966 0.422 0.054 251 17030 0.022 0.177 253 17060 255 17090 0.159 0.464 259 17148 0.419 0.009 263 17202 0.565 0.216 267 17255 0.082 -0.295 271 17305 0.279 0.185 275 17352 0.302 0.1 279 17398 0.196 -0.11 283 17441 0.369 0.071 287 17483 0.294 -0.058 291 17524 0.388 0.041 295 17563 0.535 0.039 299 17601 0.162 0.347 303 17638 0.323 -0.172 311 17709 0.403 -0.022 319 17778 0.478 0.037 327 17847 0.441 -0.029 335 17916 0.66 0.306 337 17934 0.446 339 17951 0.653 341 17969 0.518 343 17987 0.38 -0.05 351 18061 0.503 0.128 359 18140 0.508 0.098 367 18225 0.48 0.381 369 18248 0.327 371 18270 0.427 373 18294 0.479 375 18318 0.49 0.491 383 18419 0.57 0.498 387 18473 -0.099 389 18501 0.233 391 18530 0.5 0.402 393 18559 0.601 0.236 399 18652 407 18787 0.671 0.438 415 18936 0.511 0.576 423 19101 0.39 0.508 425 19145 0.414 427 19190 0.538 429 19236 0.278 431 19283 0.36 0.512 439 19482 0.611 0.499 447 19701 0.46 0.47 455 19941 0.543 0.54 3. GGC40 Ruber isotopes Column 1: Depth, midpoint (cm.) Column 2: Calendar Age (Years BP) Column 3: avg d13C G. ruber, per mil Column 4: avg d18O G. ruber, per mil Depth Age d18O d13C 10 2345 -1.61 0.84 14 3302 -1.03 0.54 18 4214 -1.38 0.17 22 5083 -1.08 0.73 26 5909 -1.24 -0.17 30 6695 -1.99 0.10 34 7442 -1.25 0.73 38 8151 -1.21 0.27 42 8823 -1.18 0.74 46 9459 -1.01 0.67 50 10061 -1.37 0.52 54 10629 -1.05 0.16 58 11166 -0.90 0.38 62 11673 -1.04 0.60 66 12150 -0.97 0.40 70 12599 -0.91 -0.16 74 13022 -0.78 0.41 78 13419 -0.37 0.63 82 13792 -0.34 0.38 86 14142 -0.48 0.43 90 14471 -0.72 0.64 94 14779 -0.02 0.27 98 15068 0.07 0.42 102 15340 0.56 0.59 106 15595 0.11 0.34 110 15834 0.65 0.30 114 16060 -0.63 0.50 118 16273 0.55 0.08 122 16474 0.33 0.46 126 16665 0.39 0.14 130 16848 0.59 0.59 132 16936 0.63 0.24 138 17191 0.33 0.38 142 17354 0.77 0.51 146 17513 0.61 0.51 150 17670 0.46 0.59 158 17981 0.72 0.50 162 18138 0.49 0.31 166 18298 0.43 0.41 170 18461 0.78 0.19 174 18629 0.59 0.59 178 18804 0.67 -0.15 182 18986 0.72 0.37 4. GGC39 Sediment Data Column 1: Depth, midpoint (cm.) Column 2: Calendar Age (Years BP) Column 3: Sedimentation Rate Column 4: Bulk Mass Accumulation Rate Column 5: Dry Mass of Sample Column 6: Sample Volume Column 7: Dry Bulk Density g/cm3 Column 8: Mass >63um Column 9: %Sand Column 10: Number of Cibicidoides Column 11: Number of C.wueller. Column 12: C.wueller./gm. Column 13: Number of U. peregrina Column 14: Cibicidoides/gm. Column 15: Uvigerina/gm. Column 16: Sand Mass/ Total Mass Column 17: Sand Mass Accumulation Rate Column 18: Sedimentation Rate x Dry Bulk Density Column 19: Uvigerina Mass Accumulation Rate Column 20: Cibicidoides Mass Accumulation Rate Depth Age sed rate bulk mass dry mass sample dry bulk de mass % sand # # C. wueller/ # Cibicidoid Uvigerina mass sand/ MAR sed rate X MAR MAR cm Yr accum. Rate of sample vol. g/cm*3 >63 um Cibicidoide C.wueller. U. peregrin per gram per gram total mass sand dry bulk dens. Uvigerina Cibicidoides 7 1197 5.847 4.172 8.68 12.16 0.71 0.5143 5.927 4 0 0 0 0.46 0 0.059 0.25 4.172046069 0 1.92 11 1752 7.205 5.598 12.99 16.72 0.78 0.7104 5.469 6 1 0.08 0 0.46 0 0.055 0.31 5.597836842 0 2.59 15 2294 7.381 5.589 12.37 16.34 0.76 0.8179 6.61 18 9 0.73 1 1.45 0.08 0.066 0.37 5.58896186 0.45 8.13 19 2823 7.562 5.619 11.29 15.2 0.74 0.5032 4.456 2 2 0.18 0 0.18 0 0.045 0.25 5.61861575 0 0.99 23 3339 7.75 5.648 11.35 15.58 0.73 0.6739 5.935 7 1 0.09 0 0.62 0 0.059 0.34 5.648297497 0 3.48 27 3843 7.945 5.951 11.38 15.2 0.75 0.5397 4.741 7 2 0.18 0 0.61 0 0.047 0.28 5.950648191 0 3.66 31 4334 8.147 6.544 12.21 15.2 0.8 0.5484 4.492 8 5 0.41 0 0.66 0 0.045 0.29 6.544131349 0 4.29 35 4813 8.357 6.523 12.46 15.96 0.78 0.5348 4.293 4 4 0.32 0 0.32 0 0.043 0.28 6.52332968 0 2.09 39 5279 8.575 6.631 12.93 16.72 0.77 0.5502 4.255 6 5 0.39 0 0.46 0 0.043 0.28 6.631367524 0 3.08 43 5734 8.801 7.086 13.16 16.34 0.81 0.5418 4.118 11 4 0.3 0 0.84 0 0.041 0.29 7.085666787 0 5.92 47 6176 9.036 7.358 13 15.96 0.81 0.5918 4.554 10 4 0.31 0 0.77 0 0.046 0.34 7.358055564 0 5.66 51 6607 9.28 7.217 12.12 15.58 0.78 0.6469 5.339 8 4 0.33 0 0.66 0 0.053 0.39 7.217433633 0 4.77 55 7027 9.534 7.658 12.82 15.96 0.8 0.6209 4.843 2 0 0 0 0.16 0 0.048 0.37 7.658143684 0 1.19 59 7435 9.798 7.016 9.52 13.3 0.72 0.3995 4.195 3 1 0.11 0 0.32 0 0.042 0.29 7.015883684 0 2.21 63 7832 10.073 6.679 9.57 14.44 0.66 0.3253 3.398 1 0 0 0 0.1 0 0.034 0.23 6.678524564 0 0.7 67 8218 10.359 6.865 7.81 11.78 0.66 0.3818 4.891 4 3 0.38 0 0.51 0 0.049 0.34 6.864552275 0 3.52 71 8594 10.658 5.831 8.73 15.96 0.55 0.7415 8.493 8 3 0.34 1 0.92 0.11 0.085 0.5 5.830647218 0.67 5.34 75 8958 10.969 6.876 7.38 11.78 0.63 0.1895 2.566 4 3 0.41 0 0.54 0 0.026 0.18 6.87629663 0 3.72 79 9313 11.293 5.557 7.29 14.82 0.49 0.2523 3.459 5 0 0 0 0.69 0 0.035 0.19 5.557420938 0 3.81 83 9656 11.631 7.925 10.87 15.96 0.68 0.2913 2.679 8 5 0.46 0 0.74 0 0.027 0.21 7.925039831 0 5.83 87 9990 11.984 8.151 10.85 15.96 0.68 0.2378 2.191 11 2 0.18 0 1.01 0 0.022 0.18 8.150696842 0 8.26 91 10314 12.353 8.037 10.63 16.34 0.65 0.1862 1.751 1 0 0 0 0.09 0 0.018 0.14 8.037236775 0 0.76 95 10628 12.739 8.453 10.34 15.58 0.66 0.1597 1.545 5 2 0.19 0 0.48 0 0.015 0.13 8.452874326 0 4.09 99 10932 13.142 8.306 10.57 16.72 0.63 0.2072 1.961 11 5 0.47 1 1.04 0.09 0.02 0.16 8.305869761 0.79 8.65 103 11227 13.563 9.308 10.95 15.96 0.69 0.2235 2.04 9 3 0.27 0 0.82 0 0.02 0.19 9.308246109 0 7.65 107 11513 14.004 9.297 10.85 16.34 0.66 0.1947 1.795 9 7 0.65 1 0.83 0.09 0.018 0.17 9.297233317 0.86 7.71 111 11789 14.466 9.446 9.43 14.44 0.65 0.1672 1.773 7 5 0.53 1 0.74 0.11 0.018 0.17 9.446177784 1 7.01 115 12057 14.95 10.054 9.97 14.82 0.67 0.1791 1.797 8 4 0.4 2 0.8 0.2 0.018 0.18 10.05412719 2.02 8.07 117 12187 15.329 10.793 11.24 15.96 0.7 23 19 1.69 4 2.05 0.36 10.79263409 3.84 22.09 119 12316 15.589 11.808 12.38 16.34 0.76 0.354 2.86 24 14 1.13 4 1.94 0.32 0.029 0.34 11.80823818 3.82 22.9 121 12442 15.855 11.942 12.02 15.96 0.75 26 9 0.75 4 2.16 0.33 11.94231184 3.97 25.83 123 12566 16.128 12.591 12.46 15.96 0.78 0.5812 4.665 69 43 3.45 13 5.54 1.04 0.047 0.59 12.59055158 13.14 69.73 125 12688 16.407 12.498 12.16 15.96 0.76 89 54 4.44 36 7.32 2.96 12.49810421 37.01 91.49 127 12808 16.694 12.766 11.62 15.2 0.76 0.6863 5.904 96 68 5.85 22 8.26 1.89 0.059 0.75 12.76618736 24.16 105.44 129 12925 16.987 12.397 11.92 16.34 0.73 72 49 4.11 21 6.04 1.76 12.39655953 21.83 74.85 131 13041 17.288 12.406 11.18 15.58 0.72 0.4633 4.144 74 60 5.37 18 6.62 1.61 0.041 0.51 12.405638 19.97 82.11 133 13155 17.597 13.056 12.12 16.34 0.74 55 33 2.72 21 4.54 1.73 13.05624169 22.62 59.23 135 13266 17.913 13.231 12.35 16.72 0.74 0.2621 2.122 62 52 4.21 8 5.02 0.65 0.021 0.28 13.23130032 8.57 66.42 137 13376 18.237 12.637 11.59 16.72 0.69 49 38 3.28 16 4.23 1.38 12.63664853 17.45 53.45 139 13484 18.57 12.707 10.92 15.96 0.68 0.2242 2.053 27 19 1.74 24 2.47 2.2 0.021 0.26 12.70695301 27.92 31.42 141 13589 18.911 13.356 12.08 17.1 0.71 35 23 1.9 32 2.9 2.65 13.35558963 35.39 38.71 143 13693 19.261 14.08 12.5 17.1 0.73 0.1997 1.598 46 33 2.64 33 3.68 2.64 0.016 0.22 14.079791 37.17 51.81 145 13795 19.62 15.023 12.8 16.72 0.77 31 16 1.25 38 2.42 2.97 15.02349868 44.59 36.38 147 13895 19.989 15.477 12.36 15.96 0.77 0.1502 1.215 38 4 0.32 30 3.08 2.43 0.012 0.19 15.47657092 37.57 47.59 149 13993 20.368 16.049 13.17 16.72 0.79 25 13 0.99 13 1.9 0.99 16.04869273 15.84 30.45 150 0 153 14185 16.92 38 25 1.48 45 2.25 2.66 154 14231 21.053 17.638 13.69 16.34 0.84 71 40 2.92 44 5.19 3.21 17.63787871 56.69 91.48 154 14231 17.94 34 41 2.29 59 1.9 3.29 155 14277 21.669 17.705 13.35 16.34 0.82 0.247 1.85 43 24 1.8 50 3.22 3.74 0.019 0.33 17.70545611 66.31 57.02 157 14368 21.985 17.518 13.32 16.72 0.8 47 25 1.88 44 3.53 3.3 17.51791624 57.86 61.8 159 14457 22.418 17.303 12.03 15.58 0.77 0.2422 2.014 33 19 1.58 14 2.74 1.16 0.02 0.35 17.30286854 20.14 47.48 161 14545 22.862 18.249 13.04 16.34 0.8 20 7 0.54 4 1.53 0.31 18.2486051 5.6 27.98 163 14631 23.318 18.085 12.97 16.72 0.78 0.3219 2.482 49 21 1.62 21 3.78 1.62 0.025 0.45 18.08525671 29.29 68.34 165 14715 23.787 19.024 13.07 16.34 0.8 38 19 1.45 12 2.91 0.92 19.02377699 17.47 55.32 167 14797 24.269 20.162 13.57 16.34 0.83 0.2826 2.082 13 10 0.74 2 0.96 0.15 0.021 0.42 20.16198416 2.97 19.31 169 14878 24.764 20.604 13.6 16.34 0.83 9 7 0.51 5 0.66 0.37 20.60428453 7.58 13.64 171 14957 25.273 22.039 14.25 16.34 0.87 0.4994 3.505 13 6 0.42 22 0.91 1.54 0.035 0.77 22.03901495 34.03 20.11 173 15034 25.797 22.905 14.17 15.96 0.89 39 19 2.75 1.34 22.90518216 30.71 63.04 175 15110 26.335 21.327 13.23 16.34 0.81 1.7044 12.88 32 12 2.42 0.91 0.129 2.75 21.3266761 19.34 51.57 177 15185 26.889 22.893 13.91 16.34 0.85 19 16 1.37 1.15 22.89284042 26.33 31.27 179 15258 27.459 21.828 12.99 16.34 0.79 1.1493 8.848 8 7 0.62 0.54 0.088 1.93 21.82822452 11.76 13.44 181 15329 28.045 23.869 14.55 17.1 0.85 4 8 0.27 0.55 23.86875509 13.12 6.56 183 15399 28.648 22.91 13.37 16.72 0.8 0.6776 5.068 13 4 0.97 0.3 0.051 1.16 22.90966167 6.85 22.27 185 15467 29.268 23.907 13.35 16.34 0.82 13 6 0.97 0.45 23.90661826 10.75 23.29 187 15534 29.906 24.119 14.1 17.48 0.81 0.3767 2.672 0 0 0 0 0.027 0.64 24.11864152 0 0 191 15663 30.898 24.953 13.81 17.1 0.81 0.3042 2.203 0 0 0 0 0.022 0.55 24.95257432 0 0 195 15787 32.29 25.635 13.58 17.1 0.79 0.2258 1.663 5 1 0.37 0.07 0.017 0.43 25.63467222 1.89 9.44 199 15906 33.766 26.74 13.54 17.1 0.79 0.277 2.046 0 0 0 0 0.02 0.55 26.73951261 0 0 203 16019 35.33 24.313 12.03 17.48 0.69 0.0826 0.687 0 2 0 0.17 0.007 0.17 24.31302265 4.04 0 207 16127 36.989 25.308 7.28 10.64 0.68 0.0686 0.942 4 1 0.55 0.14 0.009 0.24 25.30791552 3.48 13.91 207 16127 36.989 26.127 11.54 16.34 0.71 26.12727296 207 16127 36.989 18.07 6 0.33 211 16230 38.747 26.688 10.21 14.82 0.69 0.108 1.058 0 4 0 0.39 0.011 0.28 26.68758451 10.46 0 215 16329 40.612 24.98 8.88 14.44 0.62 0.0903 1.017 0 1 0 0.11 0.01 0.25 24.97975496 2.81 0 217 16376 42.085 30.843 11.7 15.96 0.73 0.0962 0.822 1 3 0.09 0.26 0.008 0.25 30.84334762 7.91 2.64 223 16512 44.143 30.619 8.43 12.16 0.69 0.0442 0.524 0 1 0 0.12 0.005 0.16 30.619124 3.63 0 227 16598 46.9 33.447 10.3 14.44 0.71 0.0678 0.658 0 3 0 0.29 0.007 0.22 33.44710526 9.74 0 231 16679 49.247 33.697 7.28 10.64 0.68 0.0262 0.36 0 0 0 0 0.004 0.12 33.69716718 0 0 235 16756 51.729 31.746 9.09 14.82 0.61 0.135 1.484 4 4 0.44 0.44 0.015 0.47 31.74561957 13.96 13.96 235 16756 51.729 37.946 11.99 16.34 0.73 37.94578579 239 16830 54.349 39.038 12.56 17.48 0.72 0.1289 1.027 0 3 0 0.24 0.01 0.4 39.03769276 9.33 0 243 16900 57.111 42.207 9.83 13.3 0.74 0.1213 1.234 0 1 0 0.1 0.012 0.52 42.20717603 4.29 0 247 16966 60.017 46.414 13.52 17.48 0.77 0.1224 0.905 1 8 0.07 0.59 0.009 0.42 46.41360446 27.47 3.43 251 17030 63.066 49.875 13.82 17.48 0.79 0.1606 1.162 0 4 0 0.29 0.012 0.58 49.87481526 14.43 0 253 17060 65.451 49.239 12.86 17.1 0.75 49.23867247 255 17090 67.08 45.022 11.22 16.72 0.67 0.168 1.497 2 2 0.18 0.18 0.015 0.67 45.02223445 8.02 8.02 259 17148 69.58 48.948 11.76 16.72 0.7 0.1873 1.592 0 2 0 0.17 0.016 0.78 48.94778218 8.32 0 259 17148 69.58 48.316 12.14 17.48 0.69 48.31630423 263 17202 73.031 51.81 11.32 15.96 0.71 0.1244 1.099 0 1 0 0.09 0.011 0.57 51.80991193 4.58 0 263 17202 73.031 31.22 4 0.13 267 17255 76.594 54.528 10.82 15.2 0.71 0.1091 1.008 0 1 0 0.09 0.01 0.55 54.5283772 5.04 0 271 17305 80.251 59.571 12.69 17.1 0.74 0.1776 1.399 0 0 0 0 0.014 0.83 59.57111512 0 0 275 17352 83.975 64.125 11.03 14.44 0.76 0.1417 1.285 0 0 0 0 0.013 0.82 64.12514768 0 0 279 17398 87.736 60.834 8.17 11.78 0.69 0.1314 1.609 0 0 0 0 0.016 0.98 60.83352075 0 0 283 17441 91.496 65.854 9.3 12.92 0.72 0.1148 1.235 0 1 0 0.11 0.012 0.81 65.85445845 7.08 0 287 17483 95.21 72.951 13.68 17.86 0.77 0.1335 0.976 0 1 0 0.07 0.01 0.71 72.95133068 5.33 0 291 17524 98.823 67.496 11.94 17.48 0.68 0.0926 0.776 0 0 0 0 0.008 0.52 67.49644821 0 0 295 17563 102.28 72.179 10.46 14.82 0.71 0.1045 0.999 0 2 0 0.19 0.01 0.72 72.17917544 13.8 0 295 17563 102.28 19.65 3 0.15 299 17601 105.515 79.025 12.24 16.34 0.75 0.1557 1.272 0 0 0 0 0.013 1.01 79.02518158 0 0 303 17638 108.464 79.731 12.01 16.34 0.74 0.1732 1.442 0 0 0 0 0.014 1.15 79.73099692 0 0 311 17709 112.14 75.383 11.75 17.48 0.67 0.2434 2.071 0 3 0 0.26 0.021 1.56 75.38271487 19.25 0 319 17778 115.541 83.678 12.93 17.86 0.72 0.2798 2.163 0 0 0 0 0.022 1.81 83.6779492 0 0 327 17847 116.808 76.57 11.21 17.1 0.66 0.1027 0.916 0 0 0 0 0.009 0.7 76.57003481 0 0 335 17916 115.798 83.954 11.3 15.58 0.73 0.219 1.939 1 1 0.09 0.09 0.019 1.63 83.95355 7.43 7.43 335 17916 115.798 28.16 8 7 0.28 0.25 337 17934 114.136 35.12 2 4 0.06 0.11 339 17951 113.214 40.94 9 7 0.22 0.17 341 17969 112.174 41.4 4 3 0.1 0.07 343 17987 111.023 76.493 10.21 14.82 0.69 0.1552 1.52 1 0 0.1 0 0.015 1.16 76.4927494 0 7.49 343 17987 111.023 33.02 2 4 0.06 0.12 351 18061 107.633 77.049 10.06 14.06 0.72 0.103 1.023 0 1 0 0.1 0.01 0.79 77.04869263 7.66 0 359 18140 101.304 77.95 12.87 16.72 0.77 0.3671 2.853 1 1 0.08 0.08 0.029 2.22 77.94955033 6.06 6.06 359 18140 101.304 24.29 8 0.33 367 18225 94.16 74.12 13.16 16.72 0.79 0.3673 2.791 1 0 0.08 0 0.028 2.07 74.12002632 0 5.63 367 18225 94.16 32.5 7 3 0.22 0.09 369 18248 89.546 37.46 1 9 0.03 0.24 371 18270 87.663 38.54 0 6 0 0.16 373 18294 85.779 45.39 5 11 0.11 0.24 375 18318 83.901 71.101 15.14 17.86 0.85 0.5696 3.763 2 5 0.13 0.33 0.038 2.68 71.10069514 23.49 9.4 375 18318 83.901 40.05 10 6 0.25 0.15 383 18419 79.214 65.275 15.34 18.62 0.82 0.181 1.18 0 6 0 0.39 0.012 0.77 65.27539905 25.53 0 387 18473 73.834 46.2 2 36 0.04 0.78 389 18501 71.221 44.71 2 41 0.04 0.92 391 18530 69.512 54.522 14.9 19 0.78 0.3345 2.245 1 25 0.07 1.68 0.022 1.22 54.52192013 91.46 3.66 391 18530 69.512 34.61 3 38 0.09 1.1 393 18559 67.834 34 7 82 0.21 2.41 399 18652 64.563 48.503 9.42 12.54 0.75 0.1626 1.726 1 6 0.11 0.64 0.017 0.84 48.50256761 30.89 5.15 407 18787 59.193 50.239 12.9 15.2 0.85 0.2309 1.79 0 10 0 0.78 0.018 0.9 50.23850104 38.94 0 415 18936 53.607 44.939 13.06 15.58 0.84 0.2338 1.79 0 10 0 0.77 0.018 0.8 44.93938808 34.41 0 423 19101 48.583 40.383 13.27 15.96 0.83 0.1892 1.426 1 27 0.08 2.04 0.014 0.58 40.38324893 82.19 3.04 423 19101 48.583 34.65 0 51 0 1.47 425 19145 45.729 43.68 0 82 0 1.88 427 19190 44.637 42.16 0 87 0 2.06 429 19236 43.576 45.64 2 60 0.04 1.31 431 19283 42.545 35.239 14.16 17.1 0.83 0.1943 1.372 1 18 0.07 1.27 0.014 0.48 35.23945126 44.78 2.49 431 19283 42.545 41.17 0 58 0 1.41 439 19482 40.085 33.58 15.6 18.62 0.84 0.2701 1.732 0 20 0 1.28 0.017 0.58 33.57990631 43.06 0 447 19701 36.521 32.385 13.48 15.2 0.89 0.2617 1.942 0 13 0 0.96 0.019 0.63 32.38451621 31.24 0 455 19941 33.35 27.227 13.03 15.96 0.82 0.1992 1.529 0 15 0 1.15 0.015 0.42 27.22684806 31.34 0 4. GGC40 Sediment Data Column 1: Depth, midpoint (cm.) Column 2: Calendar Age (Years BP) Column 3: Dry Mass of Sample Column 4: Dry Bulk Density Column 5: Sedimentation Rate Column 6: Mass Accumulation Rate Column 7: % Sand Column 8: Sand Mass, g Column 9: Mass Accumulation Rate of Sand Depth Age Sample Dry bulk Sed. MAR Sand Sand MAR yrBP mass,g density rate bulk sediment % mass, g sand 9 2345 9.889 0.865 4.182 3.62 13.19 1.305 0.477 13 3302 9.345 0.876 4.386 3.84 8.04 0.751 0.309 17 4214 10.314 0.902 4.604 4.15 8.02 0.827 0.333 21 5083 10.767 0.921 4.838 4.46 6.03 0.649 0.269 25 5909 10.992 0.941 5.088 4.79 5.45 0.599 0.261 29 6695 10.544 0.965 5.357 5.17 6.69 0.705 0.346 33 7442 10.9 0.954 5.571 5.31 6.36 0.693 0.338 35 7801 5.721 37 8151 10.897 0.953 5.955 5.68 4.58 0.499 0.26 41 8823 9.958 0.912 6.288 5.73 6.36 0.633 0.365 45 9459 9.823 0.879 6.646 5.84 4.95 0.486 0.289 49 10061 9.752 0.853 7.032 6 3.37 0.328 0.202 53 10629 9.555 0.836 7.449 6.23 3.28 0.313 0.204 57 11166 9.011 0.771 7.897 6.09 1.81 0.163 0.11 61 11673 9.127 0.798 8.381 6.69 2.14 0.195 0.143 65 12150 9.869 0.827 8.902 7.36 2.97 0.293 0.219 69 12599 8.958 0.802 9.465 7.59 3.92 0.351 0.297 73 13022 9.895 0.866 10.071 8.72 6.42 0.636 0.56 77 13419 9.685 0.887 10.722 9.51 9.39 0.909 0.893 81 13792 9.82 0.879 11.423 10.04 9.67 0.949 0.97 85 14142 9.917 0.887 12.174 10.8 4.6 0.456 0.497 89 14471 10.402 0.931 12.978 12.08 5.05 0.525 0.609 93 14779 11.167 0.999 13.834 13.82 9.91 1.106 1.369 97 15068 12.16 1.088 14.741 16.04 15.16 1.843 2.431 101 15340 11.879 1.039 15.697 16.31 3.89 0.462 0.635 105 15595 10.622 0.973 16.697 16.24 7.26 0.771 1.178 109 15834 11.129 1.019 17.732 18.07 2.67 0.298 0.483 113 16060 11.203 0.98 18.791 18.42 5.73 0.642 1.055 117 16273 9.106 0.919 19.859 18.26 3.81 0.347 0.695 121 16474 5.675 0.827 20.915 17.31 6.38 0.362 1.104 125 16665 10.346 1.314 21.936 28.82 2.39 0.247 0.689 129 16848 10.122 0.972 22.668 22.03 4.57 0.463 1.007 131 16936 23.126 133 17022 11.126 1.019 23.76 24.2 5.66 0.629 1.369 137 17191 10.452 1.029 24.501 25.21 13.55 1.416 3.415 141 17354 9.884 0.998 25.088 25.03 23.93 2.365 5.99 145 17513 8.902 0.855 25.495 21.79 6.7 0.597 1.46 149 17670 9.195 0.804 25.706 20.68 4.63 0.426 0.957 157 17981 10.408 0.999 25.5 25.49 4.32 0.45 1.102 161 18138 10.052 0.989 25.095 24.83 5.3 0.533 1.316 165 18298 11.357 1.016 24.51 24.91 3.04 0.345 0.757 169 18461 12.173 1.042 23.771 24.77 2.09 0.255 0.518 173 18629 10.583 0.926 22.907 21.21 2.38 0.252 0.505 177 18804 10.456 0.915 21.95 20.08 3.42 0.358 0.687 181 18986 7.763 0.899 9.533 8.57 4.75 0.369 0.407