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Table T15. Biostratigraphic and magnetostratigraphic datums, Hole U1407A.

Datum tie
point 		Datum Datum type Zone/
Subzone 		Age
(Ma) 		Depth (mbsf)
Top Bottom Mid-point
D01 Ba Emiliania huxleyi Calcareous nannofossil NN21 0.70 0.37 0.37 0.37
  T Pseudoemiliania lacunosa Calcareous nannofossil NN20 0.44 0.37 4.70 2.54
D02 T Reticulofenestra umbilicus (>14 µm) Calcareous nannofossil NP23 32.02 14.28 15.95 15.12
  T Isthmolithus recurvus Calcareous nannofossil   32.49 15.95 17.41 16.68
  T Coccolithus formosus Calcareous nannofossil NP22 32.92 15.95 17.41 16.68
D03 T Discoaster saipanensis Calcareous nannofossil NP21 34.44 15.95 17.41 16.68
D04 T Discoaster barbadiensis Calcareous nannofossil   34.76 17.41 18.91 18.16
  B Isthmolithus recurvus Calcareous nannofossil NP19/NP20 36.97 17.41 18.91 18.16
  Bc Chiasmolithus oamaruensis Calcareous nannofossil NP18 38.09 17.41 18.91 18.16
  T Chiasmolithus solitus Calcareous nannofossil NP17 40.40 17.41 18.91 18.16
  B Reticulofenestra umbilicus (>14 µm) Calcareous nannofossil   41.94 17.41 18.91 18.16
  T Nannotetrina fulgens Calcareous nannofossil   42.87 17.41 18.91 18.16
D05 T Chiasmolithus gigas Calcareous nannofossil NP15c 44.12 17.41 18.91 18.16
  B Chiasmolithus gigas Calcareous nannofossil NP15b 45.49 40.91 43.77 42.34
  B Nannotetrina fulgens Calcareous nannofossil NP15a 46.29 62.91 64.16 63.54
  B Nannotetrina cristata Calcareous nannofossil   47.73 83.16 85.31 84.24
  T Discoaster lodoensis Calcareous nannofossil   47.41 81.37 83.16 82.27
  B Blackites inflatus Calcareous nannofossil   47.84 83.16 85.31 84.24
  B Discoaster sublodoensis Calcareous nannofossil NP14 49.11 91.31 92.32 91.82
D10 B Dictyococcites/Reticulofenestra Calcareous nannofossil   49.47 101.75 101.95 101.85
  T Tribrachiatus orthostylus Calcareous nannofossil NP13 49.47 101.75 101.95 101.85
  T Toweius spp Calcareous nannofossil   50.78 101.75 101.95 101.85
D11 B Coccolithus crassus Calcareous nannofossil   51.64 101.75 101.95 101.85
  B Discoaster lodoensis Calcareous nannofossil NP12 53.70 112.31 121.82 117.07
  T Tribrachiatus contortus Calcareous nannofossil NP11 54.17 121.82 121.98 121.90
  B Sphenolithus radians Calcareous nannofossil   54.17 121.82 121.98 121.90
D12 B Tribrachiatus orthostylus Calcareous nannofossil   54.37 121.82 121.98 121.90
  B Discoaster diastypus Calcareous nannofossil   54.95 121.82 121.98 121.90
D13 T Fasciculithus spp. Calcareous nannofossil   55.64 121.82 121.98 121.90
  Fasciculithus division decline Calcareous nannofossil   56.00 121.82 121.98 121.90
  T Fasciculithus alanii Calcareous nannofossil   56.00 121.82 121.98 121.90
  T Ericsonia robusta (>9 µm) Calcareous nannofossil   57.10 124.61 127.57 126.09
D14 B Discoaster multiradiatus Calcareous nannofossil NP9 57.21 127.57 136.78 132.18
  B Discoaster delicatus Calcareous nannofossil   57.45 136.78 138.53 137.66
  B Ericsonia robusta (>9 µm) Calcareous nannofossil   57.54 138.53 142.90 140.72
  Tc Discoaster backmanii Calcareous nannofossil   57.57 136.78 138.53 137.66
  B Discoaster backmanii Calcareous nannofossil   58.28 142.90 147.45 145.18
  B Discoaster mohleri Calcareous nannofossil NP7 58.97 147.45 149.25 148.35
  B Sphenolithus anarrhopus Calcareous nannofossil   59.40 157.60 160.45 159.03
  B Heliolithus kleinpellii Calcareous nannofossil NP6 59.54 155.73 157.60 156.67
  B Heliolithus cantabriae Calcareous nannofossil   59.60 157.60 160.45 159.03
  B Fasciculithus tympaniformis Calcareous nannofossil NP5 61.51 170.12 172.24 171.18
  B Ellipsolithus macellus Calcareous nannofossil NP4 63.25 172.24 179.62 176.93
D16 B Cruciplacolithus intermedius Calcareous nannofossil   65.47 186.65 186.75 186.70
D17 T Micula murus, other Cretaceous nannofossils Calcareous nannofossil   66.04 186.65 186.75 186.70
D18 B Ceratolithoides kamptneri Calcareous nannofossil UC20cT 67.84 187.64 192.37 190.01
  B Nephrolithus frequens Calcareous nannofossil UC20bB 67.84 187.64 192.37 190.01
  B Micula murus Calcareous nannofossil UC20bT 69.00 187.64 192.37 190.01
  B Cribrocorona gallica Calcareous nannofossil   69.00 187.64 192.37 190.01
D19 B Lithraphidites quadratus Calcareous nannofossil UC20 69.18 187.64 192.37 190.01
D20 T Reinhardtites levis Calcareous nannofossil UC19 70.14 187.64 192.37 190.01
  T Tranolithus orionatus Calcareous nannofossil UC18 71.01 187.64 192.37 190.01
  T Uniplanarius trifidus Calcareous nannofossil UC18T 71.31 182.27 182.27 182.27
  T Broinsonia parca constricta Calcareous nannofossil UC17 72.02 187.64 192.37 190.01
  T Broinsonia parca constricta Calcareous nannofossil   72.02 187.64 192.37 190.01
  T Reinhardtites anthophorus Calcareous nannofossil   74.51 187.64 192.37 190.01
  B Reinhardtites levis Calcareous nannofossil   74.84 187.64 192.37 190.01
D21 T Eiffellithus eximius Calcareous nannofossil   75.93 187.64 192.37 190.01
  T Lithastrinus grillii Calcareous nannofossil   79.73 192.37 193.13 192.75
D22 B Broinsonia parca constricta Calcareous nannofossil   81.38 195.95 198.75 197.35
D23 B Lithastrinus grillii Calcareous nannofossil   86.50 204.82 206.61 205.72
  T Lithastrinus septenarius Calcareous nannofossil   85.56 204.82 206.61 205.72
D24 B Micula stauropora Calcareous nannofossil   89.77 206.61 223.80 215.21
D25 B Lithastrinus septenarius sensu lato Calcareous nannofossil   91.78 223.80 228.30 226.05
D26 B Eiffellithus eximius Calcareous nannofossil   92.99 223.80 228.30 226.05
  B Quadrum gartneri Calcareous nannofossil   93.55 223.80 228.30 226.05
D27 B Eprolithus moratus Calcareous nannofossil   93.73 223.80 228.30 226.05
D28 T Helenea chiastia Calcareous nannofossil   93.90 232.37 233.40 232.89
  T Corollithion kennedyi Calcareous nannofossil   94.64 232.37 233.40 232.89
D29 B Lithraphidites acutus Calcareous nannofossil   96.16 243.85 246.85 245.35
  B Corollithion kennedyi Calcareous nannofossil   100.45 250.26 259.35 254.80
  T Hayesites Calcareous nannofossil   100.84 259.35 268.60 263.97
D30 B Eiffellithus turriseiffelii Calcareous nannofossil   103.13 268.60 269.60 269.10
  T Buryella clinata Radiolarian   47.90 92.32 102.04 97.18
  B Dictyoprora mongolfieri Radiolarian   47.98 102.04 124.61 102.00
  T Buryella tetradica Radiolarian RP7 50.87 102.04 124.61 124.61
  X Bekoma campechensis – B. bidartensis Radiolarian RP7 58.23 142.90 149.25 146.07
  T Stichocampe caia Radiolarian RP6b 59.00 142.90 149.25 146.07
  T Orbulus comitata Radiolarian RP6a 59.50 149.25 164.85 157.05
  B Phormocyrtis striata exquisita Radiolarian   61.50 167.80 172.24 170.02
D15 T Anthocyrtis mespilus Radiolarian RP6a 62.00 172.24 182.27 177.25
  T Morozovella aragonensis Planktonic foraminifer E10/E9 43.26 25.43 26.80 26.12
  B Guembelitrioides nuttalli Planktonic foraminifer E8/E7 45.70 85.30 85.40 85.35
  B Morozovella aragonensis Planktonic foraminifer E5/E4 52.54 102.80 121.80 112.30
  T Globanomalina pseudomenardii Planktonic foraminifer P4/P5 57.10 124.56 127.51 126.04
  B Acarinina soldadoensis Planktonic foraminifer P4c/P4b 57.79 146.27 148.32 147.30
  B Globanomalina pseudomenardii Planktonic foraminifer P4a/P3 60.73 172.21 176.65 174.43
  T Radotruncana calcarata Planktonic foraminifer   76.18 191.52 193.10 192.31
  T Dicarinella asymetrica Planktonic foraminifer   83.64 198.19 199.37 198.78
  B Dicarinella asymetrica Planktonic foraminifer   86.66 206.57 222.63 214.60
  B Dicarinella concavata Planktonic foraminifer   91.08 222.63 224.19 223.41
  T Helvetoglobotruncana helvetica Planktonic foraminifer   92.99 224.19 225.59 224.89
  B Helvetoglobotruncana helvetica Planktonic foraminifer   93.53 227.45 228.60 228.03
  T Rotalipora cushmani Planktonic foraminifer   95.94 230.63 233.54 232.09
  B Thalmanninella reicheli Planktonic foraminifer   96.08 245.35 246.85 246.10
  B Thalmanninella globotruncanoides Planktonic foraminifer   100.50 246.85 248.35 247.60
  T Planomalina buxtorfi Planktonic foraminifer   101.92 267.40 268.16 267.78
D06 C20r/C21n Chron boundary   45.72     46.98
D07 C21n/C21r Chron boundary   47.35     82.98
D08 C21r/C22n Chron boundary   48.57     85.45
D09 C22n/C22r Chron boundary   49.34     90.69
  C25r/C26n Chron boundary   58.96     147.57

T = top, Tc = top common, B = base, Ba = base acme, Bc = base common, X = faunal crossover.

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