Table 2. Ages of calcareous nannofossil events.

Datum and event
Zones (base)
Age
(Ma)
Reference
B acme Emiliania huxleyi     0.085 1
T Helicosphaera inversa     0.16 2
B Emiliania huxleyi CN15 NN21 0.25 2
T Pseudoemiliania lacunosa CN14b NN20 0.41 2
B Helicosphaera inversa     0.51 2
T Reticulofenestra asanoi     0.85 2
B Gephyrocapsa parallela CN14a   0.95 2
B Reticulofenestra asanoi     1.16 2
T Gephyrocapsa spp. (large)     1.21 2
T Helicosphaera sellii     1.27 2
B Gephyrocapsa spp. (large)     1.45 2
T Calcidiscus macintyrei     1.65 2
B Gephyrocapsa oceanica     1.65 2
B Gephyrocapsa caribbeanica CN13b   1.73 2
T Discoaster brouweri CN13a NN19 1.97 2
T Discoaster pentaradiatus CN12d NN18 2.38 2
T Discoaster surculus CN12c NN17 2.54 2
T Discoaster tamalis CN12b   2.74 2
T Reticulofenestra ampla     2.78 2
T Reticulofenestra minutula (circ. form)     3.36 2
T Sphenolithus spp.     3.65 3
T Reticulofenestra pseudoumbilicus CN12a NN16 3.80 3
B acme Discoaster asymmetricus CN11b   ND  
T Amaurolithus primus CN11a NN15 4.37 4
B Discoaster asymmetricus   NN14 ND  
T Ceratolithus acutus CN10c   5.04 5
B Ceratolithus rugosus CN10c NN13 5.04 6
B Ceratolithus acutus CN10b   5.34 3
T Triquetrorhabdulus rugosus CN10b   5.34 3
T Discoaster quinqueramus CN10a NN12 5.56 3
T Amaurolithus amplificus     5.88 3
B Amaurolithus amplificus     6.50 3
T paracme Reticulofenestra pseudoumbilicus     6.80 3
B Amaurolithus primus CN9b   7.24 3
T Minylitha convallis     7.80 7
B Discoaster berggrenii CN9a NN11 8.35 3
B Discoaster loeblichii CN8b   8.43 3
B paracme Reticulofenestra pseudoumbilicus     8.85 3
T Discoaster hamatus CN8a NN10 9.36 3
T Catinaster calyculus     9.36 5
B Minylitha convallis     9.43 3
B Catinaster calyculus CN7b   10.70 7
B Discoaster hamatus CN7a NN9 10.39 3
T Coccolithus miopelagicus     10.39 3
B Catinaster coalitus CN6 NN8 10.71 3
T Discoaster kugleri     11.50 7
B common Discoaster kugleri     11.74 3
T Coronocyclus nitescens     12.12 3
B Discoaster kugleri CN5b NN7 12.20 3
T Cyclicargolithus floridanus     13.19 3
T Sphenolithus heteromorphus CN5a NN6 13.57 3
T Helicosphaera ampliaperta CN4 NN5 15.83 8
T acme Discoaster deflandrei     16.21 3
B Sphenolithus heteromorphus CN3   18.10 9
T Sphenolithus belemnos   NN4 18.40 9
B Sphenolithus belemnos CN2   19.70 9
T Triquetrorhabdulus carinatus   NN3 23.10 9
B Discoaster drugii CN1c NN2 23.20 7
T Sphenolithus delphix     23.80 7
T Reticulofenestra bisecta CN1a   23.90 7

Notes: B acme = base of acme interval; T acme = top of acme interval; B paracme = base of paracme interval; T paracme = top of paracme interval; B = first occurrence; T = last occurrence; ND = no reliable data. References: 1 = Thierstein et al. (1977); 2 = modified from Takayama and Sato (1987), Sato et al. (1991), Takayama (1993), and Kameo et al. (1955) by using timescale of Cande and Kent (1995); 3 = Raffi and Flores (1995); 4 = Rio et al. (1990); 5 = Curry, Shackleton, Richter, et al. (1955); 6 = Backman and Shackleton (1983); 7 = Berggren et al. (1995); 8 = Backman et al. (1990); 9 = Olafsson (1991).