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Table T15. Biostratigraphic and magnetostratigraphic datums, Hole U1404A.

Datum tie
point 		Datum Datum type Zone/Subzone Age
(Ma) 		Depth (mbsf)
Top Bottom Mid-point
  B Gephyrocapsa (>5.5 µm) Calcareous nannofossil   1.62 0.41 1.35 0.88
D01 T Discoaster tamalis Calcareous nannofossil   2.80 0.41 1.35 0.88
  T Sphenolithus spp. Calcareous nannofossil   3.54 1.96 2.46 2.21
  T Reticulofenestra pseudoumbilicus Calcareous nannofossil NN16 3.70 1.96 2.46 2.21
D02 Tc Discoaster deflandrei Calcareous nannofossil   15.80 40.59 49.36 44.97
  T Triquetrorhabdulus carinatus Calcareous nannofossil   18.28 59.11 65.86 62.48
  B? Sphenolithus disbelemnos Calcareous nannofossil   22.76 106.06 107.23 106.64
  B Discoaster druggii Calcareous nannofossil   22.82 133.03 134.71 133.87
D05 T Reticulofenestra bisecta (>10 µm) Calcareous nannofossil   23.13 144.00 145.76 144.88
D06 T Sphenolithus ciperoensis Calcareous nannofossil NP25 24.43 145.76 153.72 149.74
  T Sphenolithus distentus Calcareous nannofossil   26.44 175.05 184.17 179.61
D07 Bc Triquetrorhabdulus carinatus Calcareous nannofossil   26.57 181.99 185.63 183.81
  B Sphenolithus ciperoensis Calcareous nannofossil NP24 29.62 185.63 191.73 188.68
D08 T Reticulofenestra umbilicus (>14 µm) Calcareous nannofossil NP23 32.02 200.60 200.63 200.62
  T Isthmolithus recurvus Calcareous nannofossil   32.49 200.60 200.63 200.62
  T Coccolithus formosus Calcareous nannofossil NP22 32.92 200.60 200.63 200.62
  Ta Clausicoccus subdistichus Calcareous nannofossil   33.43 201.20 201.50 201.35
  T Discoaster saipanensis Calcareous nannofossil NP21 34.44 206.71 207.61 207.61
  T Discoaster barbadiensis Calcareous nannofossil   34.76 206.71 207.61 207.61
  T Reticulofenestra reticulata Calcareous nannofossil   35.40 209.26 210.61 209.93
  B Isthmolithus recurvus Calcareous nannofossil NP19/NP20 36.97 212.76 219.80 216.28
  T Chiasmolithus grandis Calcareous nannofossil   37.98 219.80 220.56 220.18
  B Dictyococcites bisectus (>10 µm) Calcareous nannofossil   40.36 244.03 245.01 244.52
  T Chiasmolithus solitus Calcareous nannofossil NP17 40.40 272.21 279.56 275.88
  T Nannotetrina spp. Calcareous nannofossil   41.85 279.56 281.27 280.41
  B? Reticulofenestra umbilicus (>14 µm) Calcareous nannofossil   41.94 281.27 281.27 281.27
  T Dorcadospyris ateuchis Radiolarian   18.64 59.13 71.30 66.21
  B Stichocory delmontensis Radiolarian   19.35 81.06 90.57 85.82
  B Calocycletta virginis Radiolarian   21.82 124.87 134.71 129.79
  B Cyrtocapsella tetrapera Radiolarian   21.82 124.87 134.71 129.79
  B Eucyrtidium diaphanes Radiolarian   23.00 115.07 124.87 119.97
  B Lychnocanoma elongata Radiolarian   24.18 144.00 153.72 148.86
  B Calocycletta robusta Radiolarian   25.97 163.20 172.77 167.99
  B Dorcadospyris ateuchus Radiolarian   28.64 172.77 244.03 208.40
  T Sethochytris triconiscus Radiolarian   39.35 244.03 244.63 244.33
  B Podocyrtis goetheana Radiolarian   40.14 244.63 253.05 248.84
  T Lophocyrtis biaurita Radiolarian   40.14 244.63 253.05 248.84
  X Podocyrtis mitra – P. chalara Radiolarian   40.65 270.63 289.83 280.23
D10 X Podocyrtis sinuosa – P. mitra Radiolarian   43.38 299.80   299.80
D03 T Paragloborotalia kugleri Planktonic foraminifer M1b/M2 21.12 73.85 75.35 74.60
D04 B Globoquadrina dehiscens Planktonic foraminifer M1a/M1b 22.44 89.35 90.54 89.95
  B Paragloborotalia kugleri Planktonic foraminifer OE7/M1a 22.96 92.53 94.06 93.30
  C12r/C13n Chron boundary   33.16     200.67
  C13r/C15n Chron boundary   35.00     206.42
D09 C17n.1r/C17n.2n Chron boundary   37.87     222.22
  C18n.1n/C18n.1r Chron boundary   39.63     238.90
  C18n.1r/C18n.2n Chron boundary   39.70     240.72
  C18n.2n/C18r Chron boundary   40.15     248.89
  C18r/C19n Chron boundary   41.15     266.04
  C19n/C19r Chron boundary   41.39     268.49

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

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