Table 2. Microfossil datums at Holes 1083A and 1083B.
Fossil group
Event
Age
(Ma)
Zone
(base)
Core, section,
interval (cm)
Depth
(mbsf)
A
B
Top
Bottom
Top
Bottom
Mean





175-1083A- 175-1083A-


N FO Emiliania huxleyi acme 0.09 NN21b
1H-CC 2H-2, 90 1.74 4.20 2.97
N FO Emiliania huxleyi 0.26 NN21a CN15 3H-CC 5H-1, 140 20.94 31.70 26.32
N LO Gephyrocapsa caribbeanica acme 0.26 NN21a CN15 3H-CC 5H-1, 140 20.94 31.70 26.32
N LO Pseudoemiliania lacunosa 0.46 NN20 CN14b 5H-6, 10 5H-CC 37.80 40.19 39.00
R LO Axoprunum angelinum 0.46

3H-CC 5H-CC 20.94 40.19 30.57
N LO Small Gephyrocapsa acme (Weaver, 1993) 0.60

6H-CC 7H-1, 80 42.42 50.10 46.26
D LO Nitzschia reinholdii 0.69

7H-CC 8H-CC 59.08 68.89 63.89
S LO Bachmannocena quadrangula 0.80

7H-CC 8H-CC 59.08 68.89 63.89
N LO Reticulofenestra asanoi 0.83

8H-3, 40 8H-5, 60 62.20 65.30 63.75
N LO Small Gephyrocapsa acme (Gartner, 1977) 0.96

10H-2, 130 10H-4, 80 80.60 83.00 81.80
R LO Lamprocyrtis neoheteroporos 1.07

9H-CC 10H-CC 77.84 87.60 82.72
D LO Rhizosolenia matuyama 1.10

10H-CC 11H-CC 87.60 96.53 92.07
N LO Helicosphaera sellii 1.25

11H-CC 12H-3, 120 96.53 101.00 98.77
N LO Calcidiscus macintyrei 1.67

18H-CC 15H-CC 124.54 134.79 129.67
D LO Proboscia barboi 1.68

14H-CC 15H-CC 124.54 134.79 129.67
R LO Cycladophora pliocenica 1.83

18H-CC 19H-CC 162.61 173.22 129.67
N LO Discoaster brouweri 1.95 NN19 CN13a 17H-CC 18H-CC 154.12 162.91 158.52





175-1083B- 175-1083B-


N FO Emiliania huxleyi 0.26 NN21a CN15 3H-3, 130 3H-5, 130 16.60 19.60 18.10
N LO Gephyrocapsa caribbeanica acme 0.26 NN21a CN15 3H-3, 130 3H-5, 130 16.60 19.60 18.10

Notes: Fossil group: N = calcareous nannofossils; R = radiolarians; D = diatoms; and S = silicoflagellates. FO = first occurrence and LO = last occurrence. Zonal codes refer to the standard calcareous nannofossil zonations of (A) Martini (1971) and (B) Okada and Bukry (1980).