Table T5. Calcareous nannofossil, planktonic and benthic foraminifer, and diatom biostratigraphic events, Hole U1312A.
| Core, section, interval (cm) |
Zone* (base) |
Species event | Depth (mbsf) |
Age (Ma) |
|---|---|---|---|---|
| 306-U1312A- | ||||
| 1H-CC | NN21 | FO Emiliania huxleyi | 14.25 | 0.25 |
| 2H-CC | NN20 | LO Pseudoemiliania lacunosa | 14.25 | 0.41 |
| 3H-CC | NN19 | LO Fragilariopsis reinholdii | 23.75 | 0.50 |
| 3H-CC | LO large Gephyrocapsa spp. | 23.75 | 1.21 | |
| 3H-CC | LO Helicosphaera sellii | 23.75 | 1.27 | |
| 3H-CC | FO large Gephyrocapsa spp. | 33.25 | 1.45 | |
| 4H-CC | FO Gephyrocapsa caribbeanica | 39.40 | 1.73 | |
| 4H-CC | NN18 | FO Globorotalia truncatulinoides/Globorotalia inflata | 42.75 | 2.08 |
| 5H-2, 130–131 | LO Discoaster brouweri | 39.40 | 1.97 | |
| 5H-5, 125–126 | NN17 | LO Discoaster pentaradiatus | 43.025 | 2.38 |
| 5H-5, 125–126 | NN16 | LO Discoaster surculus | 43.025 | 2.54 |
| 5H-CC | LO Globorotalia puncticulata/Neogloboquadrina atlantica | 42.75 | 2.41 | |
| 6H-CC | LO Thalassiosira convexa | 52.25 | 2.40 | |
| 6H-CC | LO Discoaster tamalis | 52.25 | 2.74 | |
| 6H-CC | Disappearance Globorotalia hirsuta | 52.25 | 3.18 | |
| 10H-CC | Reappearance Globorotalia puncticulata | 99.75 | 3.31 | |
| 12H-CC | NN15 | Disappearance Globorotalia puncticulata | 109.25 | 3.57 |
| 12H-CC | LO Reticulofenestra pseudoumbilicus | 109.25 | 3.85 | |
| 13H-CC | NN12/NN13/NN14 | LcO Globorotalia margaritae | 118.75 | 3.98 |
| 13H-CC | LO Amaurolithus primus | 118.75 | 4.56 | |
| 14H-CC | FaO Globorotalia puncticulata | 137.75 | 4.52 | |
| 18H-CC | NN11D | LO Discoaster quinqueramus | 166.25 | 5.54 |
| 17H-CC | NN11C | FaO Globorotalia margaritae | 166.25 | 6.00 |
| 18H-CC | LO Amaurolithus amplificus | 166.25 | 6.00 | |
| 17H-CC | Coiling change Neogloboquadrina pachyderma (s/d) | 166.25 | 6.30 | |
| 18H-CC | NN11B | FO Amaurolithus amplificus | 175.75 | 6.84 |
| 18H-CC | NN11A | FcO gr. Globorotalia miotumida | 175.75 | 7.24 |
| 18H-CC | FO Amaurolithus primus | 175.75 | 7.39 | |
| 19H-CC | LO Globorotalia menardii 4 | 175.75 | 7.51 | |
| 19H-CC | NN10B | FO Discoaster berggrenii | 185.25 | 8.28 |
| 20H-CC | Coiling change Neogloboquadrina pachyderma (d/s) | 185.25 | 7.80 | |
| 20H-CC | FO Discoaster loeblichii | 194.75 | 8.43 | |
| 21H-CC | NN10A | LO Globorotalia lenguaensis | 194.75 | 8.99 |
| 21H-CC | FO Minylitha convallis | 204.25 | 9.43 | |
| 22H-CC | NN9 | LO Discoaster hamatus | 204.25 | 9.64 |
| 24H-CC | NN8 | FO Discoaster hamatus | 232.75 | 10.48 |
| 25H-CC | NN7 | LO Coccolithus miopelagicus | 232.75 | 10.95 |
Notes: Dark blue = nannofossils, pink = foraminifers, light blue = diatoms. For first occurrences (FO), depth is plotted as the midpoint between the depth at which the species was first observed and the depth of the sample below. For last occurrences (LO), depth is plotted as the midpoint between the depth at which the species was last observed and the depth of the sample above. LcO = last common occurrence, FaO = first abundant occurrence, FcO = first common occurrence. d = dextral, s = sinistral. * = from Martini (1971).
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