Table 2. Microfossil datums at Hole 1077A.
Fossil
group
Event
Age
(Ma)
Zone (base)
Core, section, interval (cm)
Depth (mbsf)
A
B
Top
Bottom
Top
Bottom
Mean





175-1077A- 175-1077A-


N FO Emiliania huxleyi acme 0.09 NN21b
3H-6, 70 3H-CC 22.70 24.09 23.40
N FO Emiliania huxleyi 0.26 NN21a CN15 7H-3, 130 7H-5, 130 56.80 59.84 58.32
N LO Gephyrocapsa caribbeanica acme 0.26 NN21a CN15 7H-3, 130 7H-5, 130 56.80 59.84 58.32
N LO Pseudoemiliania lacunosa 0.46 NN20 CN14b 7H-CC 8H-3, 130 62.55 66.30 64.43
R LO Axoprunum angelinum 0.46

7H-CC 8H-CC 62.55 72.24 67.39
N LO Small Gephyrocapsa acme (Weaver, 1993) 0.60*

7H-CC 9H-3, 130 72.24 75.80 74.02
S LO Bachmannocena quadrangula 0.80

12H-CC 13H-CC 110.14 119.47 114.81
N LO Reticulofenestra asanoi 0.83

13H-6, 10 13H-CC 117.10 119.47 118.29
N LO Small Gephyrocapsa acme (Gartner, 1977) 0.96
CN14a 16H-3, 10 16H-CC 141.10 148.28 144.69
R LO Lamprocyrtis neoheteroporos 1.07

18H-CC 19H-CC 166.73 176.39 171.56
N LO Helicosphaera sellii 1.25

17H-6, 10 17H-CC 154.80 157.55 156.18
N LO Calcidiscus macintyrei 1.67

18H-6, 120 18H-CC 165.70 166.73 166.22

Notes: Fossil group: N = calcareous nannofossils; S = silicoflagellates; and R = radiolarians. FO = first occurrence and LO = last occurrence. * = middle isotope Stage 15 (Weaver, 1993); age interpolated from Imbrie et al. (1984). Zonal codes refer to the standard calcareous nannofossil zonations of (A) Martini (1971) and (B) Okada and Bukry (1980).