Table 2. Calcareous nannofossil datums and their assigned age estimates.
Event
Age
(Ma)
Zone (base)
Reference
A
B
FO Emiliania huxleyi acme 0.09 NN21b
1
FO Emiliania huxleyi 0.26 NN21a CN15 1
LO Gephyrocapsa caribbeanica acme 0.26 NN21a CN15 2
LO Pseudoemiliania lacunosa 0.46 NN20 CN14b 1
LO Gephyrocapsa spp. small acme 0.6

11
LO Reticulofenestra asanoi 0.83

3
LO Gephyrocapsa spp. small acme 0.96
CN14a 4
FO Reticulofenestra asanoi 1.06

3
LO Helicosphaera sellii 1.25

4
LO Calcidiscus macintyrei 1.67

4
Pleistocene/Pliocene boundary 1.77

10
LO Discoaster brouweri 1.95 NN19 CN13a 4
FCO Discoaster triradiatus 2.15

4
LO Discoaster pentaradiatus 2.45 NN18 CN12d 5
LO Discoaster surculus 2.55 NN17 CN12c 6
LO Discoaster tamalis 2.83
CN12b 6
late/early Pliocene boundary 3.58

10
LO Sphenolithus spp. 3.66

7
LO Reticulofenestra pseudoumbilicus 3.82 NN16 CN12a 7
LO Amaurolithus tricorniculatus 4.5 NN15 CN11 8
FO Discoaster asymmetricus 5.02 NN14 CN10d 7
LO Ceratolithus acutus 5.05

9
FO Ceratolithus rugosus 5.23 NN13 CN10c 6
LO Triquetrorhabdulus rugosus 5.23

9
Pliocene/Miocene boundary 5.32

10
FO Ceratolithus acutus 5.37
CN10b 9
LO Discoaster quinqueramus 5.54 NN12 CN10a 9
LO Amaurolithus amplificus 5.9

10
FO Amaurolithus amplificus 6.6

10
FO Amaurolithus primus 7.2
CN9b 10
FO Discoaster quinqueramus 8.6 NN11 CN9a 10
FO Discoaster berggrenii 8.6 NN11 CN9a 10
FO Reticulofenestra pseudoumbilica (>5µm) paracme 8.7

7
FO Discoaster loeblichii 8.7
CN8b 10
LO Discoaster bollii 9.1

10
LO Discoaster hamatus 9.63 NN10 CN8a 7
FO Discoaster hamatus 10.7 NN9 CN7 10
late/middle Miocene boundary 11.2

10
FO Catinaster coalitus 11.3 NN8 CN6 10
LO Discoaster kugleri 11.5

10
FO Discoaster kugleri 11.8 NN7 CN5b 10
FO Triquetrorhabdulus rugosus 13.2

10
LO Sphenolithus heteromorphus 13.6 NN6 CN5a 10
LO Helicosphaera ampliaperta 15.6 NN5 CN4 10
middle/early Miocene boundary 16.4

10
FO Sphenolithus heteromorphus 18.2
CN3 10
LO Sphenolithus belemnos 18.3 NN4
10
LO Triquetrorhabdulus carinatus 18.3-23.2 NN3
10
FO Sphenolithus belemnos 19.2 NN3 CN2 10
FO Discoaster druggii 23.3 NN2 CN1c 10

Notes: FO = first occurrence; LO = last occurrence; and FCO = first common occurrence. Zonal codes are those of (A) Martini (1971) and (B) Okada and Bukry (1980). Age references: (1) Thierstein et al. (1977); (2) Pujos (1988); (3) Sato et al. (1991); (4) Raffi et al. (1993); (5) Lourens et al. (1996); (6) Tiedemann et al. (1994); (7) Raffi and Flores (1995); (8) Shipboard Scientific Party (1997); (9) Backmann and Raffi (1997); (10) Berggren et al. (1995b); (11) Weaver (1993).