North Iceland Shelf Carbonate and Foraminiferal Oxygen Isotope Data ----------------------------------------------------------------------- World Data Center for Paleoclimatology, Boulder and NOAA Paleoclimatology Program ----------------------------------------------------------------------- NOTE: PLEASE CITE CONTRIBUTORS WHEN USING THIS DATA!!!!! NAME OF DATA SET: North Iceland Shelf Carbonate and Foraminiferal Oxygen Isotope Data LAST UPDATE: 8/2004 (Original receipt by WDC Paleo) CONTRIBUTOR: Isla S. Castañeda, Institute for Arctic and Alpine Research and Department of Geological Sciences, University of Colorado. Now at: Large Lakes Observatory, University of Minnesota. IGBP PAGES/WDCA CONTRIBUTION SERIES NUMBER: 2004-048 SUGGESTED DATA CITATION: Castañeda, I.S., et al.. 2004. North Iceland Shelf Carbonate and Foraminiferal Oxygen Isotope Data. IGBP PAGES/World Data Center for Paleoclimatology Data Contribution Series # 2004-048. NOAA/NGDC Paleoclimatology Program, Boulder CO, USA. ORIGINAL REFERENCE: Castañeda, I.S., L.M. Smith, G.B. Kristjánsdóttir, and J.T. Andrews. 2004. Temporal changes in Holocene d18O records from the northwest and central North Iceland Shelf. Journal of Quaternary Science, Volume 19, Issue 4, Pages 321 - 334. doi: 10.1002/jqs.841. ABSTRACT: The region of north Iceland is highly sensitive climatically owing to its location with respect to atmospheric and oceanographic fronts. In this study we present total carbonate and d18O records of benthic and planktic Foraminifera from nine sediment cores from the North Iceland Shelf. The results of this work indicate that the deglaciation of the Vestfirdir Peninsula was completed by 10,200 cal. yr BP. The 8200 cal. yr BP cold event is present only as a minor isotopic event, and seems not to have had much of a cooling effect on the bottom waters of the northwest Iceland shelf. The Holocene maximum warmth, attributed to a stronger North Icelandic Irminger Current, occurred between ca. 7800 and 6200 cal. yr BP. Over the past 4500 cal. yr BP a general cooling trend has occurred on the North Iceland Shelf, and superimposed on this overall cooling trend are a number of oscillations between periods when relatively warmer and cooler waters occupied the shelf. Relatively cooler waters were present at 4200-4000 cal. yr BP, 3200-2900 cal. yr BP, 2500-2350 cal. yr BP and 600-200 cal. yr BP, whereas relatively warmer waters were present on the shelf at 3750-3450 cal. yr BP, 2800-2600 cal. yr BP and 1700-1000 cal. yr BP. GEOGRAPHIC REGION: North Atlantic, Iceland Shelf PERIOD OF RECORD: 11 KYrBP - present FUNDING SOURCES: Office of Polar Studies P.A.L.E. Program; Grant Number: NSF-ATM-9531397, NSF OCE-OCE98-09001, NSF-OPP-0004233. University of Colorado, Beverly Sears Dean's Small Grants. DESCRIPTION: This dataset contains oxygen isotope data and percent total carbonate data for nine sediment cores collected from the North Iceland shelf. Methods: Cores were collected in the summer of 1997 aboard the Bjarni Saemundsson's B997 cruise. The chronologies of all cores were determined by AMS 14C dating of molluscs and foraminifera, and by tephrochronology. Foraminifera for stable isotopic analysis were picked from the sieved 1000-106 um fraction after samples were sonicated. Between 10 and 20 individuals were selected and only "clean" tests were picked. Stable isotope measurements were made at the Leibniz-Laboratory for Radiomatric Dating and Stable Isotope Research at Kiel University on a Finnigan MAT 251 mass-spectrometer with an on-line coupled Kiel carbonate device. The carbon content of the sediment was determined by analysis on a CM5012 CO2 Coulometer at the University of Colorado, Boulder. Site Locations: site # longitude latitude water depth(m) core length(cm) B997-317 18°51.900' 66°35.270' 494 248 B997-321 18°58.470' 66°53.470' 480 300 B997-324 21°09.133' 66°31.426' 282 300 B997-327 20°51.793' 66°38.485' 373 330 B997-328 21°32.903' 65°57.416 96 422 B997-329 21°17.917' 65°58.002' 111 447 B997-330 21°05.284' 65°52.006' 170 540 B997-331 21°38.422' 66°04.095' 46 210 B997-332 21°35.085' 66°08.198' 108 530 DATA: 1. Core B997-317 d18O and Carbonate Column 1: Depth in cm. Column 2: Age in Calendar years before present Column 3: d18O N. pachyderma (s) Column 4: Percent total carbonate Depth Age d18O %carb. 0.6 12 2.62 1.3 23 4.67 5.0 93 4.92 10.0 186 4.75 10.6 197 2.44 15.0 279 5.17 20.0 371 5.83 20.6 383 2.54 25.0 464 6.42 30.0 557 6.08 30.6 754 35.0 650 6.25 40.0 743 6.25 40.6 940 2.54 45.0 836 6.5 50.0 928 6.5 50.6 1109 2.32 55.0 1021 6.42 60.0 1092 7.75 60.6 1395 2.4 65.0 1234 7.67 70.0 1377 8 70.6 1680 2.47 75.0 1519 7.58 80.0 1662 7.75 80.6 1965 2.48 85.0 1805 7.58 90.0 1947 8.08 90.6 2250 2.45 95.0 2090 8.5 100.0 2233 7.92 100.6 2536 2.34 105.0 2375 8.17 110.0 2518 8 110.6 2821 2.42 114.8 2653 7.83 117.3 2725 8.17 120.0 2803 8.25 120.6 3106 2.34 125.0 2946 8.67 130.0 3088 8.17 130.6 3392 2.6 135.0 3231 6.92 140.0 3374 8.83 140.6 6958 2.54 145.0 4975 4.83 150.6 10924 2.57 152.0 7442 3.67 158.0 9558 3.92 161.9 11264 3.09 162.0 10968 0.75 165.0 11071 1.5 170.0 11243 1.08 170.6 11607 3.32 175.0 11414 0.33 180.0 11586 0.42 180.6 11951 3.29 185.0 11757 0.58 190.0 11929 0.5 190.6 12294 3.64 195.0 12101 0.25 200.0 12272 0.25 200.6 12637 3.51 205.0 12444 0.33 210.0 12616 0.33 210.6 12809 3.51 215.0 12787 0.25 215.6 13324 3.76 220.0 12959 0.25 225.0 13130 0.25 230.0 13302 0.42 230.6 13667 3.78 235.0 13474 0.42 240.0 13645 0.5 240.6 13745 3.63 2. Core B997-321 d18O and Carbonate Column 1: Depth in cm. Column 2: Age in Calendar years before present Column 3: d18O N. pachyderma (s) Column 4: Percent total carbonate Depth Age d18O %carb. 1.3 370 3.5 1.9 386 2.5 5.0 465 4.33 10.0 592 4.5 10.6 608 2.51 15.0 719 4.67 20.0 845 5.08 20.6 861 2.49 25.0 972 5.33 30.0 1099 5.33 30.6 1115 2.83 35.0 1226 5.67 40.0 1352 6.25 40.6 1368 2.67 45.0 1479 7 50.0 1606 6.25 50.6 1622 2.6 55.0 1733 6.67 60.0 1860 7.08 60.6 1875 2.71 65.0 1986 6.58 70.0 2113 6.58 70.6 2129 2.23 75.0 2240 6.75 80.0 2367 7.08 80.6 2383 2.54 85.0 2493 6.58 90.0 2620 7.5 90.6 2636 2.5 95.0 2747 7.25 100.0 2874 7.17 100.6 2890 2.42 105.0 3001 6.58 110.0 3127 7.5 110.6 3143 2.5 115.0 3254 6.25 120.0 3381 6.67 120.6 3397 2.48 125.0 3508 6.42 130.0 3634 7.5 130.6 3650 2.46 135.0 3761 6.67 140.0 3888 8.33 140.6 3904 2.65 144.3 3996 10.83 147.0 4066 10.17 150.5 4154 9.75 151.1 4170 2.65 155.0 4268 7.67 161.0 4407 6.83 161.1 4409 2.68 165.5 4467 6.83 170.5 4534 6.08 171.1 4543 2.57 175.0 4595 6.5 180.0 4662 6.83 185.0 4728 8 190.0 4795 7.5 181.1 4677 2.5905 191.1 4810 2.4805 195.0 4862 7.58 200.0 4929 7.17 201.1 4944 2.6105 205.0 4996 10.25 210.0 5063 10.83 211.1 5078 2.3705 217.5 5164 11.25 221.0 5211 7.83 221.1 5212 2.4005 225.0 5264 8.42 230.0 5331 8.08 231.1 5346 1.9928 235.0 5398 8.33 240.0 5465 8 241.1 5480 2.3828 245.0 5532 8.33 250.0 5599 6 251.1 5614 2.4928 255.0 5666 4.92 260.0 5733 6.42 261.1 5748 2.5428 265.0 5800 5.25 267.0 5827 5.08 270.0 5867 5.83 271.1 5882 2.2419 275.0 5934 5.58 280.0 6016 6.75 281.1 6168 2.5419 285.0 6690 7.75 290.0 7365 7.17 291.1 7517 2.5028 293.6 7854 2.7228 3. Core B997-324 d18O and Carbonate Column 1: Depth in cm. Column 2: Age in Calendar years before present Column 3: d18O N. pachyderma (s) Column 4: d18O T. quinqueloba Column 5: d18O M. barleeanus Column 6: Percent total carbonate Depth Age d18O pachy d18O quin d18O barlee %carb. 2 26 2.87 3 73 2.35 5 167 12.33 6 214 3.01 9 355 2.35 10 402 3.10 12 15 637 2.45 11.75 16 684 1.55 3.06 19 825 2.51 20 872 3.00 12.67 25 1108 2.49 13.08 26 1155 1.40 2.86 29 1296 2.05 30 1343 13.92 32 1437 3.07 35 1578 2.31 14.17 36 1625 1.65 3.06 39 1766 2.58 40 1813 3.05 14.58 45 2048 2.09 14.58 46 2095 1.49 49 2236 2.37 50 2283 3.03 14.42 55 2518 2.37 15.25 56 2565 1.43 2.94 59 2707 2.25 60 2754 2.95 15.33 65 2989 2.07 15.17 66 3036 1.15 2.88 69 3177 2.25 70 3224 2.97 15.67 75 3459 2.38 17.33 76 3521 1.68 2.94 79 3707 2.23 80 3769 1.81 2.89 15.5 85 4079 2.25 15 86 4140 1.58 2.94 89 4326 2.40 90 4388 1.87 2.95 15.25 95 4698 15.25 99 5104 2.25 100 5206 1.52 2.95 14.25 105 5714 15.42 110 6221 2.25 12.83 111 6323 1.40 112 6424 2.89 115 7428 12.75 120 7412 10.5 121 7548 2.11 122 7685 1.63 2.86 125 8094 2.17 8.58 126 8231 1.65 2.98 130 8777 2.75 131 8913 1.99 132 9050 1.60 3.16 135 9459 2.71 1.67 136 9596 3.21 139 10005 1.33 141 10278 2.08 142 10281 1.71 3.11 145 10291 2.03 1.58 146 10294 2.95 150 10307 0.08 151 10310 1.97 152 10327 3.00 155 10376 1.71 0.33 159 10443 0.5 161 10476 1.61 165 10542 2.78 0.75 170 10625 0.25 171 10642 2.95 174 10692 0 176 10725 0 179 10775 2.92 180 10791 1.67 185 10874 2.89 0.33 190 10957 0.25 191 10974 2.59 195 11022 2.53 0.58 200 11082 0.33 201 11094 2.86 205 11142 2.00 0.33 210 11202 0 215 11262 2.10 0 220 11323 0 225 11383 0 230 11443 0.42 231 11455 2.35 235 11503 2.55 0.58 240 11563 0.33 245 11623 0.42 250 11683 0.5 255 11743 0.33 260 11803 0.42 265 11863 0.42 270 11923 0.25 275 11983 2.45 0.75 280 12044 0.5 281 12056 2.59 4. Core B997-327 d18O and Carbonate Column 1: Depth in cm. Column 2: Age in Calendar years before present Column 3: d18O N. pachyderma (s) Column 4: Percent total carbonate Depth Age d18O %carb. 1 394 2.58 1.25 395 8.5 5 410 2.59 8.92 10 430 8.75 11 434 2.74 15 450 2.61 6.75 20 470 6.25 21 474 2.41 25 490 2.33 7 30 510 7.08 31 514 2.58 35 530 2.93 7.25 40 550 7.58 41 554 1.81 45 570 2.75 7.33 48 581 2.75 49 585 2.69 50 589 4.58 51 593 2.27 55 609 2.7 7.5 60 629 7.75 61 633 2.38 65 649 2.51 7.67 70 669 9 71 673 2.57 75 724 2.27 8.17 80 788 8.42 81 800 2.58 85 851 2.51 9.25 90 915 9.42 91 928 2.62 91 928 2.52 95 979 2.7 9 100 1042 8.92 101 1055 2.52 105 1106 2.55 9.25 110 1169 9.67 111 1182 2.47 115 1233 2.48 9.25 120 1297 10.92 121 1310 2.42 125 1360 2.68 10 130 1424 10.67 131 1437 2.59 135 1488 2.46 10.08 140 1551 10 141 1564 2.33 145 1615 2.54 11 145 1615 2.37 150 1679 11.25 151 1691 2.55 155 1742 2.85 9.75 160 1806 10.67 161 1819 2.53 163.5 1851 10.83 170 1933 10.25 171 1946 2.53 175 2018 2.59 10.17 180 2108 10.25 181 2126 2.39 185 2198 2.72 11 190 2288 11.58 191 2306 2.5 195 2378 2.36 13.17 201 2486 2.61 200 2468 11.83 205 2558 2.73 11 210 2648 10.75 211 2666 2.53 215 2738 2.61 10.75 220 2828 10.92 221 2846 2.53 221 2846 2.54 225 2918 2.34 10.83 230 3008 10.92 231 3026 2.56 235 3098 2.61 11 240 3188 12.42 241 3206 2.6 245 3278 2.49 10.58 250 3368 10.25 251 3387 2.24 255 3459 2.6 9.5 260 3549 10.08 261 3567 2.57 265 3639 2.67 11.33 270 3729 11.42 271 3747 2.63 275 3819 2.52 11.92 280 3909 13.83 281 3927 2.49 285 3999 2.67 14.75 290 4089 15.08 291 4107 2.6 295 4179 2.69 11.92 300 4269 11.92 301 4287 2.44 305 4359 10.92 5. Core B997-328 d18O and Carbonate Column 1: Depth in cm. Column 2: Age in Calendar years before present Column 3: d18O C. lobatulus Column 4: Percent total carbonate Depth Age d18O %carb. 3.75 26 2.46 5 35 6.5 10 70 1.96 6.75 13.75 96 2.09 15 105 6.25 20 141 1.99 8 25 178 7.25 30 215 2.4 5.25 33.75 243 2.44 35 253 4.5 40 291 2.13 4.92 43.75 320 2.44 45 329 3.83 50 368 4.58 53.75 398 2.39 55 408 4.5 60 448 2.32 63.75 478 2.26 65 488 6.42 70 529 2.38 6.42 73.75 560 2.45 75 571 6.5 80 613 2.09 6.75 85 655 6.08 90 698 2.03 6.58 93.75 731 1.99 95 742 7.75 100 786 2.28 6.83 103.75 819 2.02 105 830 7.17 110 875 2.06 7.17 113.75 909 2.15 115 920 7 119.75 964 2.08 6.92 123.75 1001 1.89 125 1013 7.67 128.75 1048 2.03 130 1059 8.67 133.75 1095 1.89 135 1107 7.83 138.75 1143 2.14 140 1155 8.17 143.75 1191 1.7 145 1203 8.42 148.75 1239 2.26 150 1252 7.08 153.75 1289 2.16 155 1301 7.17 158.75 1338 1.89 160 1351 7.25 165 1401 7.75 168.75 1439 1.87 170 1452 8.25 175 1503 8.33 178.75 1542 1.99 180 1555 8.75 183.75 1594 1.74 185 1607 8.17 188.75 1647 1.8 190 1660 8.5 193.75 1700 1.97 195 1713 9.42 200 1767 9.17 203.75 1808 2.18 205 1821 7.25 208.75 1862 2.01 210 1876 8.75 213.75 1917 1.93 215 1931 8.5 218.75 1973 2.09 220 1987 8.92 223.75 2029 2.13 225 2043 9.5 228.75 2085 2.13 230 2100 10 233.75 2142 2.16 235 2157 10.75 238.75 2200 1.79 240 2214 10.08 243.75 2258 2.16 245 2273 8.67 248.75 2317 2.19 250 2331 7.58 253.75 2376 2.15 255 2390 8.42 258.75 2435 2.25 260 2450 7.08 263.75 2495 2.34 265 2510 7.25 268.75 2555 2.07 270 2571 6.83 273.75 2616 2.15 275 2632 7.25 278.75 2678 2.01 280 2693 8.5 283.75 2740 1.82 285 2755 8 288.75 2802 2.43 290 2818 8.58 293.75 2865 2.2 295 2881 7.75 300 2945 7.08 305 3009 6.83 308.75 3057 2.25 310 3073 7.67 313.75 3122 2.4 315 3138 6.92 318.75 3187 2.16 320 3204 7.67 323.75 3253 2.2 325 3270 7.33 328.75 3319 1.99 330 3336 8.42 333.75 3386 2.27 335 3403 8.67 338.75 3453 2.1 340 3470 9.08 343.75 3521 1.92 345 3538 9.33 350 3607 9.67 353.75 3658 2.19 355 3676 10.33 358.75 3728 1.86 360 3745 10.58 363.75 3797 1.71 365 3815 10.25 368.75 3868 2.09 370 3885 9.25 373.75 3938 2.01 375 3956 9.25 378.75 4010 2.16 380 4028 8.83 383.75 4081 2.27 385 4099 7.67 388.75 4154 2.12 390 4172 7 393.75 4226 1.95 395 4245 6.92 398.75 4300 2.23 400 4318 6.5 405 4392 5.92 408.75 4448 1.94 410 4466 7.42 413.75 4522 2.1 415 4541 7.08 418.75 4597 2.15 420 4616 6.92 6. Core B997-329 d18O and Carbonate Column 1: Depth in cm. Column 2: Age in Calendar years before present Column 3: d18O C. lobatulus Column 4: Percent total carbonate Depth Age d18O %carb. 0 0 1.98 2 141 2.05 4 423 2.09 6 705 1.86 7 845 9.25 8 986 2.18 10 1268 2.04 12 1709 2.17 17 14 2309 2.16 16 2909 1.93 17 3209 19.92 18 3509 1.93 20 4109 2.05 22 4709 1.80 24 5309 1.88 25 5609 20 26 5674 1.96 28 5805 1.79 30 5935 1.93 14 32 6066 1.81 34 6196 1.92 35 6261 20.67 36 6327 1.77 38 6457 1.72 40 6588 1.82 16.08 42 6718 1.82 44 6849 1.92 45 6914 16.33 46 6979 1.93 48 7110 1.93 50 7240 1.89 17.5 52 7370 2.10 54 7501 1.65 55 7566 14.33 56 7631 2.09 58 7762 1.73 60 7892 2.05 13.25 64 8153 2.05 65 8219 10.33 66 8284 1.89 68 8414 2.20 70 8545 2.26 9.5 74 8806 1.99 75 8871 9.58 80 9037 1.91 11.25 84 9170 1.94 85 9203 10.17 86 9213 2.17 88 9232 2.02 90 9251 2.04 8 94 9290 2.19 95 9299 8.33 100 9347 2.23 8.67 104 9386 2.23 105 9396 8.75 110 9444 2.18 114 9482 2.15 115 9492 9.25 120 9540 1.94 7.58 122 9559 1.97 124 9578 1.98 125 9588 5.42 126 9598 2.05 128 9617 2.11 130 9636 1.96 7.17 134 9675 2.13 135 9684 7.33 140 9732 2.12 6 144 9771 2.11 145 9781 6.5 154 9867 2.19 155 9877 6.58 160 9925 2.62 6.17 164 9963 2.32 165 9973 7.75 170 10021 2.56 6.33 174 10060 2.20 175 10069 5.17 180 10117 2.38 5.25 184 10131 2.36 185 10133 3.08 190 10140 2.28 4.67 194 10146 2.12 195 10148 1.5 200 10155 2.47 1.17 204 10161 2.33 205 10163 1.25 210 10170 2.21 1.5 214 10176 2.24 215 10178 2 220 10185 2.23 1.08 224 10191 1.96 225 10193 1.67 230 10200 2.41 2.08 234 10206 2.30 235 10208 2.42 240 10215 2.25 2.67 244 10221 2.26 245 10223 2.5 250 10230 2.77 2.58 254 10236 2.41 255 10238 2.67 260 10245 2.50 2.67 264 10251 2.45 265 10253 2.58 270 10260 2.60 2.25 274 10266 2.74 275 10268 2.5 280 10275 2.08 2.17 284 10281 2.76 290 10290 2.67 1.67 294 10296 2.74 295 10297 1.92 300 10305 2.83 2.08 304 10311 2.97 305 10312 3.33 310 10320 2.68 3 314 10326 2.80 315 10327 2.42 320 10335 2.70 2.92 324 10341 2.41 325 10342 2.08 330 10350 2.62 2 334 10356 2.20 335 10357 1.67 340 10365 2.70 1.67 344 10371 1.82 347 10375 0.58 350 10380 2.58 354 10386 2.58 355 10387 1.33 360 10395 2.77 3 364 10401 2.28 365 10402 1.92 370 10410 2.66 2 374 10416 2.61 375 10417 1.5 380 10425 2.59 1.75 384 10431 2.65 385 10432 1.58 390 10440 2.77 1.67 394 10446 2.74 395 10447 1.75 400 10455 3.22 0.83 405 10462 1.75 410 10469 2.97 2.08 414 10475 2.83 420 10484 2.93 1.5 424 10490 2.69 425 10492 1.25 7. Core B997-330 d18O and Carbonate Column 1: Depth in cm. Column 2: Age in Calendar years before present Column 3: d18O C. lobatulus Column 4: Percent total carbonate Depth Age d18O %carb. 0 0 2.28 1.25 17 9.92 5 69 2.55 9 10 137 2.29 10.17 15 206 2.49 10.75 20 280 2.52 12.33 25 405 2.58 10 30 530 2.23 11.08 35 655 2.48 11.5 40 723 2.42 12.83 45 791 2.36 12.17 50 859 2.22 12.75 55 927 2.18 12.17 60 995 2.33 11.75 65 1063 2.46 12.25 70 1131 2.22 12 75 1199 2.3 13.25 80 1267 2.1 13.25 85 1335 2.26 13.17 90 1403 2.24 13.33 95 1471 2.36 13.08 100 1539 2.18 12.83 105 1607 2.4 12.92 110 1675 2.41 13.25 115 1770 2.47 13.42 120 1865 2.28 13.75 125 1960 2.43 15.25 130 2056 2.3 16.25 135 2151 2.39 14.83 140 2246 2.36 14.42 145 2327 2.41 13 150 2386 2.43 13.75 155 2445 2.42 12.92 160 2505 2.43 13.33 165 2564 2.49 13.25 170 2624 2.31 12.75 175 2683 2.28 14.08 180 2742 2.33 13.83 185 2802 2.37 14.42 190 2861 2.26 15.08 195 2920 2.34 14.33 200 2980 2.34 13.5 205 3039 2.53 12.67 210 3099 2.4 13.08 215 3158 2.44 13.42 220 3217 2.53 12.5 225 3277 2.38 13.08 230 3336 2.37 12.17 235 3395 14.33 240 3509 2.29 16.33 245 3595 2.34 15.25 250 3682 2.37 14.92 255 3768 2.21 16.17 260 3855 2.4 15.5 265 3941 2.74 14.42 270 4028 2.53 14.42 275 4114 2.59 13.33 280 4201 2.56 12.17 285 4287 2.61 11.75 290 4374 2.53 11.42 295 4460 7.25 300 4547 2.47 10.83 305 4678 2.54 10.92 310 4821 2.54 11.17 315 4965 2.33 11.67 320 5108 2.53 11.67 325 5251 2.41 10.58 330 5394 2.49 11 335 5537 2.34 11.42 340 5680 2.44 10.75 345 5823 2.41 9.92 350 5966 2.09 10 355 6109 2.26 10.08 360 6252 2.11 10.58 365 6395 2.01 9.17 370 6538 1.91 9.67 375 6681 9.42 380 6824 8.92 385 6967 2.15 8.75 390 7110 2.21 7.83 395 7253 1.81 8.83 400 7396 2.06 9.25 405 7539 2.21 9.08 410 7682 2.34 8.92 415 7826 2.24 8.58 420 7969 2.22 8.58 425 8112 2.19 8.08 430 8255 2.43 7.08 435 8398 2.46 7.25 440 8541 2.38 5.67 445 8684 2.25 7.17 450 8827 2.58 7.75 455 8970 2.51 7.67 460 9113 2.44 6.5 465 9256 2.63 7.83 470 9399 2.42 6.42 475 9542 2.27 6.25 480 9685 2.69 6.08 485 9828 2.62 6.08 490 9971 2.46 5.08 495 10114 2.53 6.25 500 10257 2.5 5.33 505 10400 2.52 5.17 510 10543 2.62 5.25 515 10686 2.46 4.33 520 10830 2.43 4.17 525 10973 2.61 4.33 528.75 11080 4.67 8. Core B997-331 d18O and Carbonate Column 1: Depth in cm. Column 2: Age in Calendar years before present Column 3: d18O C. lobatulus Column 4: Percent total carbonate Depth Age d18O %carb. 0 287 1.74 4 383 2.20 5 407 14.67 10 527 2.12 11 14 623 2.02 15 647 12.58 20 767 1.94 13 22 815 1.84 25 888 15.58 26 912 2.02 28 960 1.86 30 1008 1.69 16 34 1104 1.76 35 1128 19.17 40 1248 2.02 25.17 44 1344 1.79 45 1368 22.25 50 1488 1.75 25.58 54 1584 1.84 55 1608 29.33 60 1728 2.00 30.83 64 1824 1.73 65 1848 35.17 70 1969 1.81 30.08 74 2065 2.10 75 2089 25.67 80 2209 1.80 28.75 84 2305 1.96 85 2329 24.67 90 2449 1.91 22.92 94 2545 2.06 95 2569 25.92 100 2689 1.89 20.83 104 2785 1.84 105 2809 20.33 110 2929 1.97 22.67 114 3026 1.94 115 3050 20.08 120 3170 1.79 122 3218 12.17 124 3266 1.84 130 3410 1.85 16 134 3506 1.74 135 3530 10 140 3582 1.74 11.33 144 3623 1.82 145 3633 11 150 3685 1.96 9.92 154 3726 1.81 155 3736 10.5 160 3788 1.85 10.33 164 3829 1.71 165 3840 9.67 170 3891 1.91 11.83 174 3933 1.86 175 3943 10.67 180 3994 2.02 10.75 184 4036 1.85 185 4046 10 190 4098 2.01 12.25 194 4139 2.04 9. Core B997-332 d18O and Carbonate Column 1: Depth in cm. Column 2: Age in Calendar years before present Column 3: d18O C. lobatulus Column 4: Percent total carbonate Depth Age d18O %carb. 0 0 1.91 2 267 1.9 4 534 2.04 5 668 43.92 6 802 1.93 8 1069 1.91 10 1336 1.91 12 1603 1.82 13 1737 44.75 14 1870 1.99 16 2137 1.76 18 2405 1.83 20 2672 1.81 22 2939 2 24 3246 1.75 26 3334 1.69 27 3378 36.42 28 3422 1.68 30 3510 1.88 34 3686 1.88 36 3774 1.96 38 3862 1.88 40 3951 1.96 27.08 44 4127 1.89 46 4215 1.66 48 4303 2.04 50 4391 1.84 25.25 54 4567 1.9 55 4611 21.75 56 4655 1.81 58 4743 1.78 60 4831 2.01 16.58 64 5007 2.02 65 5051 15.75 66 5095 2.09 68 5183 1.87 70 5271 2.22 16.67 72 5359 1.79 74 5448 1.91 75 5492 14.83 76 5536 1.84 80 5712 1.92 13.75 84 5888 1.79 85 5932 12.33 90 6152 1.89 12.83 94 6328 2 95 6372 11.75 100 6592 2 12.67 102 6680 2.07 104 6768 1.88 105 6812 12.33 106 6857 2.03 108 6945 1.82 110 7033 2.13 13.83 114 7209 2.1 115 7253 14.5 120 7473 2.14 14.25 124 7649 2.09 125 7693 15.17 130 7913 1.83 15 134 8089 2.18 135 8133 12.92 140 8354 2.01 12.67 144 8530 1.9 145 8574 10.92 150 8794 2.19 8.92 154 8970 2.02 155 9014 9.08 160 9086 2.22 6 164 9144 2.22 165 9158 7.08 170 9231 2.07 5.83 174 9289 2.39 175 9303 6.17 180 9375 2.21 5.5 184 9433 2.38 185 9447 5.25 190 9520 2.12 5.83 194 9577 2.17 195 9592 5.25 200 9664 2.29 5.17 204 9722 2.15 205 9736 5.17 210 9809 2 4.75 214 9866 2.05 215 9881 4 220 9953 1.93 4.75 224 10011 2.33 225 10025 2.17 230 10098 1.95 0.83 234 10155 1.97 237 10199 0.08 240 10242 1.91 244 10278 2.09 245 10282 8 250 10300 2.38 6.17 254 10315 2.28 255 10318 5.25 260 10336 2.38 5.5 264 10351 2.46 265 10355 6.33 270 10373 2.02 5.58 274 10387 2.06 275 10391 6.5 280 10409 2.31 5.75 284 10424 2.47 285 10427 5.08 290 10446 2.7 5.25 294 10460 2.77 295 10464 3.75 300 10482 2.38 6 304 10497 2.5 305 10500 3.33 310 10518 2.37 5.83 314 10533 2.53 315 10537 5.08 320 10555 2.32 2.83 324 10569 2.78 325 10573 4 330 10591 2.85 4.08 334 10606 2.59 335 10609 4.33 340 10627 2.61 5.33 344 10642 2.78 345 10646 4 350 10664 2.78 3.33 354 10678 2.49 355 10682 3.17 360 10690 2.37 2.92 364 10696 2.6 365 10698 3.25 370 10706 2.78 374 10712 2.95 375 10714 2.25 380 10722 2.81 2 384 10728 2.84 385 10730 2.67 390 10737 2.75 2.75 394 10744 2.88 395 10745 3.17 400 10753 2.64 3.25 404 10760 2.95 405 10761 2.33 410 10769 2.87 1.75 414 10776 2.66 415 10777 2.5 420 10785 2.77 2.17 424 10791 2.92 425 10793 2.67 430 10801 2.82 3.08 434 10807 2.93 435 10809 2.42 440 10817 2.81 2.33 444 10823 2.85 445 10825 1.33 450 10833 2.84 1.33 454 10839 2.92 455 10841 1.67 460 10848 1.5 464 10855 2.86 465 10856 1.33 470 10864 2.81 0.42 474 10871 2.89 475 10872 0.33 480 10880 3.09 0.67 484 10887 2.94 485 10888 0.83 490 10896 2.91 0.42 494 10902 2.94 495 10904 0.33 500 10912 2.96 0.67 504 10918 2.9 505 10920 0.83 510 10928 2.79 0.83 514 10934 2.89 515 10936 0.75