Table T7. Distribution and relative abundances of selected diatom species, Hole 1151A. Note: NPD = North Pacific diatom zones, A = abundant, G = good, R = rare, F = few, T = trace, C = common, P = poor, M = moderate, r = reworking, VG = very good. Leg Site Hole Core Type Section Top (cm) Bottom (cm) Depth (mbsf) Diatom zones NPD Geological Age Preparation Preservation Group abundance Actinocyclus ellipticus Actinocyclus ingens Actinocyclus oculatus Actinoptychus senarius Aulacoseira spp. Cavitatus jouseanus Cocconeis costata Coscinodiscus marginatus Crucidenticula nicobarica Delphineis simonsenii Denticulopsis dimorpha Denticulopsis hyalina Denticulopsis katayamae Denticulopsis lauta Denticulopsis praedimorpha Denticulopsis praelauta Denticulopsis simonsenii Fragilariopsis doliolus Hemidiscus cuneiformis Ikebea tenuis Kieselviella carina Koizumia tatsunokuchiensis Neodenticula kamtschatica Neodenticula koizumii Neodenticula seminae Nitzschia fossilis Nitzschia reinholdii Nitzschia rolandii Paralia sulcata Proboscia barboi Proboscia curvirostris Pyxidicula zabelinae Rhizosolenia hebetata f. hiemalis Rouxia californica Stephanopyxis horridus Stephanopyxis turris Thalassionema nitzschioides Thalassionema schraderi Thalassiosira antiqua Thalassiosira gravida Thalassiosira jouseae Thalassiosira latimarginata Thalassiosira nidulus Thalassiosira oestrupii Thalassiosira praeoestrupii Thalassiosira yabei Thalassiothrix longissima Chaetoceros spp. (resting spores) 186 1151 A 2 R 1 70 73 78.70 P. curvirostris 11 Pleistocene A G R C R R R F F R F R R F 186 1151 A 2 R CC 5 8 82.08 P. curvirostris 11 Pleistocene A G R C R R C F C R A 186 1151 A 3 R CC 0 5 92.50 P. curvirostris 11 Pleistocene A G C r R R F C F A 186 1151 A 4 R 2 138 142 96.18 A. oculatus 10 Pleistocene A VG F F C F F F F C 186 1151 A 4 R CC 15 19 99.51 A. oculatus 10 Pleistocene A G R R F C R R R F C 186 1151 A 5 R CC 0 5 105.90 A. oculatus 10 late Pliocene C G R T F R F R F F R F C 186 1151 A 6 R 1 70 72 113.30 N. koizumii 9 late Pliocene A G R F F C F F F R R C 186 1151 A 6 R CC 8 13 118.07 N. koizumii 9 late Pliocene A G R R R r C C T C R F T F F F A 186 1151 A 7 R 1 70 73 122.90 N. koizumii 9 late Pliocene C G F R C R R F F R C 186 1151 A 7 R CC 14 19 126.45 N. koizumii 9 late Pliocene A G F R r F R F C F F C C 186 1151 A 8 R CC 18 22 136.78 N. koizumii 9 late Pliocene A G R C R R F F R C 186 1151 A 9 R CC 7 11 147.17 N. koizumii 9 late Pliocene A G R R R C T T C R F R A 186 1151 A 10 R CC 18 21 158.64 N. koizumii 9 late Pliocene A M F F F C F C R F 186 1151 A 11 R CC 12 16 168.86 N. koizumii 9 late Pliocene A G R C F C F F 186 1151 A 12 R 3 140 144 174.60 N. koizumii - N. kamschatica 8 late Pliocene A G R C r F C R R C R F 186 1151 A 12 R CC 7 12 179.96 N. koizumii - N. kamschatica 8 late Pliocene A G F R F C R R R F F R 186 1151 A 13 R CC 11 16 187.11 N. koizumii - N. kamschatica 8 late Pliocene C G F r R C R R F R R F C 186 1151 A 14 R CC 9 14 199.19 N. koizumii - N. kamschatica 8 early Pliocene A G C F C R R F R R R F 186 1151 A 15 R 4 72 74 204.42 T. oestrupii 7Bb early Pliocene A G F r r C C F F F 186 1151 A 15 R CC 0 5 208.87 T. oestrupii 7Bb early Pliocene C G R F R C R F C F R R R F 186 1151 A 16 R CC 8 12 218.64 T. oestrupii 7Bb early Pliocene C G R R C R F F R R R 186 1151 A 17 R CC 0 4 222.75 T. oestrupii 7Bb early Pliocene A G F A R C R R F 186 1151 A 18 R CC 11 14 237.89 T. oestrupii 7Bb early Pliocene C G C C R R T F F F F F 186 1151 A 19 R CC 16 19 244.96 T. oestrupii 7Bb early Pliocene A G R R C R A F R R F 186 1151 A 20 R CC 12 15 252.50 T. oestrupii 7Bb early Pliocene C G R R C C T F F T 186 1151 A 21 R CC 12 15 266.69 T. oestrupii 7Bb early Pliocene A G R C C R F F R R C 186 1151 A 22 R CC 12 15 276.14 T. oestrupii 7Bb early Pliocene C VG C F C R F R R R R 186 1151 A 23 R CC 14 17 285.05 T. oestrupii 7Bb early Pliocene A M C C R R F R R R F 186 1151 A 24 R CC 11 14 295.17 T. oestrupii 7Bb early Pliocene C G R C R F F R F 186 1151 A 25 R CC 12 15 305.39 T. oestrupii 7Bb early Pliocene C M C T F C F R C 186 1151 A 26 R CC 14 17 312.54 T. oestrupii 7Bb early Pliocene C G F F C T F R F T R F 186 1151 A 27 R CC 17 20 321.44 T. oestrupii 7Bb early Pliocene C G R C R F R F F F C 186 1151 A 28 R CC 14 17 333.38 T. oestrupii 7Bb early Pliocene A G R F C C F R R R F 186 1151 A 29 R CC 14 17 344.01 T. oestrupii 7Bb early Pliocene A G F F C F F F R R T F 186 1151 A 30 R CC 10 13 353.56 T. oestrupii 7Bb early Pliocene A G F C R F C F F 186 1151 A 31 R CC 14 17 360.99 T. oestrupii 7Bb early Pliocene C G F C F R C T R F 186 1151 A 32 R CC 15 17 367.05 T. oestrupii 7Bb early Pliocene C M R C C F R F R R T F 186 1151 A 33 R CC 19 22 377.61 T. oestrupii 7Bb early Pliocene A G R R C F C R R R R 186 1151 A 34 R CC 13 16 388.11 T. oestrupii 7Bb early Pliocene C M R R R R R C F R R R 186 1151 A 35 R CC 17 21 396.01 T. oestrupii 7Bb early Pliocene F M R F T R F T R T R 186 1151 A 36 R CC 12 15 406.49 T. oestrupii 7Bb late Miocene C G T R C r C C F R R R F 186 1151 A 37 R CC 11 14 415.43 T. oestrupii 7Bb late Miocene A G R R C C T T F R C R R F 186 1151 A 38 R 1 70 73 421.30 T. oestrupii 7Bb late Miocene C G R C R R C R F F T F 186 1151 A 38 R CC 9 12 426.21 N. kamtschatica 7Ba late Miocene C M C C R F R R R F 186 1151 A 39 R CC 12 15 433.64 N. kamtschatica 7Ba late Miocene C G F T C F R F R R F 186 1151 A 40 R CC 17 20 445.36 N. kamtschatica 7Ba late Miocene F M F C F F R R 186 1151 A 41 R CC 12 14 455.01 N. kamtschatica 7Ba late Miocene C G R C F F R R 186 1151 A 42 R CC 11 13 464.46 N. kamtschatica 7Ba late Miocene A G r A R F C R T T 186 1151 A 43 R CC 9 11 473.30 N. kamtschatica 7Ba late Miocene A G R F C R F T R F 186 1151 A 44 R CC 0 5 487.25 N. kamtschatica 7Ba late Miocene C G C C C R F R 186 1151 A 45 R CC 15 20 492.21 N. kamtschatica 7Ba late Miocene A G R T r A F R F R T R 186 1151 A 46 R CC 12 17 505.75 N. kamtschatica 7Ba late Miocene A G R C C R F F R R 186 1151 A 47 R CC 13 18 516.13 N. kamtschatica 7Ba late Miocene A G R F A R F R F 186 1151 A 48 R CC 11 15 524.49 N. kamtschatica 7Ba late Miocene A M R T F r C F R C R 186 1151 A 49 R CC 15 20 533.52 N. kamtschatica 7Ba late Miocene A G R R r R C C F T F 186 1151 A 50 R CC 15 19 541.94 N. kamtschatica 7Ba late Miocene A M R R F T F R C F F 186 1151 A 51 R CC 14 18 554.63 N. kamtschatica 7Ba late Miocene A G R C A R R F R R 186 1151 A 52 R CC 18 22 563.99 N. kamtschatica 7Ba late Miocene A VG R T R C F C F F 186 1151 A 53 R CC 16 20 573.28 N. kamtschatica 7Ba late Miocene A G F R F C R C F R F 186 1151 A 54 R CC 14 18 582.76 N. kamtschatica 7Ba late Miocene C M R F C C R C 186 1151 A 55 R CC 8 13 584.38 N. kamtschatica 7Ba late Miocene A G R R R C R R A R F C 186 1151 A 56 R CC 13 17 596.47 N. kamtschatica 7Ba late Miocene C M R F C F R R 186 1151 A 57 R CC 13 17 609.84 N. kamtschatica 7Ba late Miocene C M R F R C R F R R 186 1151 A 58 R CC 13 17 622.95 N. kamtschatica 7Ba late Miocene C M R F R T F R F F 186 1151 A 59 R CC 12 15 631.34 N. kamtschatica 7Ba late Miocene C G R F r F C R F R F 186 1151 A 60 R CC 21 24 640.76 N. kamtschatica 7Ba late Miocene C M R F T R F R 186 1151 A 61 R CC 17 20 649.03 N. kamtschatica 7Ba late Miocene C M F R F F R R 186 1151 A 62 R CC 14 17 652.80 N. kamtschatica 7Ba late Miocene F M r F r F T T F R R 186 1151 A 63 R CC 15 17 664.31 N. kamtschatica 7Ba late Miocene F M F r F R R R R 186 1151 A 64 R 1 35 37 671.15 N. kamtschatica 7Ba late Miocene C M r R F r R T R R 186 1151 A 65 R CC 14 16 688.40 N. kamtschatica 7Ba late Miocene C G r R F r F R R T R 186 1151 A 66 R 1 70 73 690.50 N. kamtschatica 7Ba late Miocene C M r F r r F R F R R 186 1151 A 66 R CC 19 21 693.43 N. kamtschatica 7A late Miocene C M R C R R R T F R 186 1151 A 67 R CC 9 11 705.63 N. kamtschatica 7A late Miocene F M F R F R R T R R 186 1151 A 68 R CC 22 25 718.84 N. kamtschatica 7A late Miocene C G r R C T T F F 186 1151 A 69 R CC 16 18 725.77 N. kamtschatica 7A late Miocene C G r R F r F R R R R 186 1151 A 70 R CC 16 18 732.14 N. kamtschatica 7A late Miocene C G R R F r R R F R R 186 1151 A 71 R CC 15 17 747.10 N. kamtschatica 7A late Miocene F M R F r R F R R F 186 1151 A 72 R CC 14 18 755.44 N. kamtschatica 7A late Miocene A M T C r T R F R R 186 1151 A 73 R CC 17 21 767.11 N. kamtschatica 7A late Miocene F M R F R T R R R 186 1151 A 74 R CC 18 21 774.79 N. kamtschatica 7A late Miocene C M r R C r r F T F F R 186 1151 A 75 R CC 0 4 784.18 N. kamtschatica 7A late Miocene C M r R R C r R R C T R R R F 186 1151 A 76 R CC 18 22 794.56 N. kamtschatica 7A late Miocene F M R T F R R 186 1151 A 77 R CC 18 22 800.62 N. kamtschatica 7A late Miocene C M R F R R R R F F 186 1151 A 78 R 1 70 73 806.10 R. californica 7A late Miocene C G F r R R T R F R R R 186 1151 A 78 R CC 12 16 814.52 R. californica 7A late Miocene C M R F r r R R T C R F 186 1151 A 79 R 1 70 73 815.70 R. californica 7A late Miocene C M R F R R R F T F F 186 1151 A 79 R CC 0 5 816.95 R. californica 7A late Miocene F M F T T R T R 186 1151 A 80 R 1 73 77 825.33 T. schraderi 6B late Miocene C G R F r r R R R F R R 186 1151 A 80 R 3 70 74 828.30 T. schraderi 6B late Miocene C G F r R R F R R R 186 1151 A 80 R CC 14 16 834.47 T. schraderi 6B late Miocene C M R C R F R F R F 186 1151 A 81 R CC 14 17 836.94 T. schraderi 6B late Miocene C M C R R R R R F 186 1151 A 82 R CC 20 22 850.93 T. schraderi 6B late Miocene C M T C R R F T R F 186 1151 A 84 R CC 16 19 872.05 T. schraderi 6B late Miocene C M R F F F R F 186 1151 A 85 R CC 2 5 882.45 T. schraderi 6B late Miocene F M R R R F R T F C F 186 1151 A 86 R CC 7 9 886.60 T. schraderi 6B late Miocene C M R C T R R R R R 186 1151 A 87 R CC 18 21 897.70 T. schraderi 6B late Miocene C M T R F F T R F R 186 1151 A 88 R CC 0 3 911.06 T. schraderi 6B late Miocene C M F R R R R R C F 186 1151 A 89 R CC 13 16 920.99 T. schraderi 6B late Miocene C M R F R R R R F T R 186 1151 A 90 R 2 71 74 923.01 T. schraderi 6A late Miocene C M T F R T T F R T R 186 1151 A 90 R CC 22 25 926.10 T. schraderi 6A late Miocene C M F T F R T T R R T R R R F 186 1151 A 91 R 1 70 73 931.10 T. schraderi 6A late Miocene F M T F F T F R R F 186 1151 A 91 R 3 70 73 934.10 T. schraderi 6A late Miocene F M T F r R R F T R 186 1151 A 91 R 5 70 73 937.10 D. katayamae 6A late Miocene F M T R R R R F R F 186 1151 A 91 R CC 21 23 939.54 D. katayamae 6A late Miocene C M T R T F R R T R F R R F 186 1151 A 92 R 2 70 73 942.21 D. dimorpha 5D late Miocene C G F C C F F R 186 1151 A 92 R 4 70 73 945.04 D. dimorpha 5D late Miocene C M R R F R F F 186 1151 A 92 R CC 27 31 948.09 D. dimorpha 5D late Miocene C G R R F F R R C F 186 1151 A 93 R 1 70 73 950.40 D. dimorpha 5D late Miocene C G R T F C r F F R 186 1151 A 93 R CC 22 26 953.73 D. dimorpha 5D late Miocene A G R F T C T C R C F 186 1151 A 94 R 1 70 73 960.00 D. dimorpha 5D late Miocene R P R R r T F R 186 1151 A 94 R CC 18 21 962.76 D. dimorpha 5D late Miocene C M T T F F F R C R 186 1151 A 95 R 1 70 73 969.60 D. dimorpha 5D late Miocene C M F C R F R 186 1151 A 95 R CC 0 3 970.00 D. dimorpha 5D late Miocene A G R F C F T C T R 186 1151 A 96 R 1 72 77 979.32 T. yabei 5C late Miocene C G R R R F R F F 186 1151 A 96 R CC 21 24 982.34 T. yabei 5C late Miocene C G F T R C R F F 186 1151 A 97 R 1 69 72 988.89 T. yabei 5C late Miocene C M F R r C R F 186 1151 A 97 R CC 21 24 995.83 T. yabei 5C late Miocene C M F R F r C R R 186 1151 A 98 R 1 68 70 998.48 T. yabei 5C late Miocene C M R C T F C R F R 186 1151 A 98 R CC 18 21 1003.72 T. yabei 5C late Miocene C M R F F R T R F R F 186 1151 A 99 R 1 69 72 1008.09 T. yabei 5C middle Miocene F M R R R R 186 1151 A 99 R CC 17 20 1009.53 T. yabei 5C middle Miocene F M R F F R R R 186 1151 A 100 R 1 66 69 1017.66 D. praedimorpha 5B middle Miocene C G R F R C r F F 186 1151 A 100 R CC 20 23 1020.57 D. praedimorpha 5B middle Miocene C M R R R R C F F F 186 1151 A 101 R 1 71 73 1027.31 D. praedimorpha 5B middle Miocene A M F C T C F F F R R 186 1151 A 101 R 1 90 91 1027.50 D. hustedtii 4Bb middle Miocene C M R F C T F R R 186 1151 A 101 R 2 62 64 1028.33 D. hustedtii 4Bb middle Miocene acid A G C F C R T R R R 186 1151 A 101 R CC 18 21 1028.78 D. hustedtii 4Bb middle Miocene C G C F F F R R R 186 1151 A 102 R 1 69 72 1036.89 D. hustedtii 4Bb middle Miocene C M C T R C F R R 186 1151 A 102 R 2 72 75 1038.42 D. hyalina 4Ba middle Miocene C M F R R C F R 186 1151 A 102 R CC 16 19 1039.51 D. hyalina 4Ba middle Miocene C M C R R R F R R 186 1151 A 103 R 1 66 69 1046.56 D. hyalina 4Ba middle Miocene F M R R F R R 186 1151 A 103 R CC 18 20 1048.85 D. hyalina 4Ba middle Miocene F M F T F R T R R 186 1151 A 104 R 1 70 73 1056.30 D. hyalina 4Ba middle Miocene C M C T R F R R R 186 1151 A 104 R CC 16 18 1061.21 D. lauta 4A middle Miocene C M C T T R T r R T 186 1151 A 105 R 2 90 91 1067.70 D. lauta 4A middle Miocene F M F R R R 186 1151 A 105 R CC 19 21 1074.44 D. lauta 4A middle Miocene C M C R R r R F 186 1151 A 106 R 3 70 73 1078.70 D. lauta 4A middle Miocene F P F R T R 186 1151 A 106 R CC 19 21 1083.11 D. lauta 4A middle Miocene F M F R R r R F R 186 1151 A 107 R 3 72 74 1088.20 D. lauta 4A middle Miocene F P F T R T T T 186 1151 A 107 R CC 24 26 1093.97 D. lauta 4A middle Miocene F M F R R T R T 186 1151 A 108 R 4 56 58 1099.19 D. lauta 4A middle Miocene F M R R R F R 186 1151 A 108 R CC 20 22 1104.08 D. praelauta 3B middle Miocene F M F R R F T R T 186 1151 A 109 R 4 71 75 1108.81 D. praelauta 3B middle Miocene F M R R R T R R 186 1151 A 109 R CC 10 13 1113.46 D. praelauta 3B middle Miocene F M F T T R F F R