|
Nannofossil event
|
Zone
(base)
|
Degree of
reliability |
Age
(Ma)
|
|
X medium Gephyrocapsa (>3.5 µm)–Emiliania huxleyi
|
|
|
0.082–0.063
|
|
FO Emiliania huxleyi
|
NN21
|
B
|
0.291
|
|
LO Pseudoemiliania lacunosa
|
NN20
|
A
|
0.436
|
|
LCO Reticulofenestra asanoi
|
|
A
|
0.905–0.901*
|
RE medium Gephyrocapsa (≥4 µm) +
FO Gephyrocapsa sp. 3 (G. parallela)
|
|
A
|
1.04
|
|
FCO Reticulofenestra asanoi
|
|
D
|
1.136–1.078*
|
|
LO large Gephyrocapsa (>5.5 µm)
|
|
A
|
1.24
|
|
LO Helicosphaera sellii
|
|
C
|
1.34
|
|
FCO large Gephyrocapsa (>5.5 µm)
|
|
|
1.46
|
|
FO large Gephyrocapsa (>5.5 µm)
|
|
B
|
1.560–1.617*
|
|
LO Calcidiscus macintyrei (≥11 µm)
|
|
C
|
1.60
|
|
FO medium Gephyrocapsa (>3.5 µm)
|
|
A
|
1.67
|
|
LO Discoaster brouweri
|
NN19
|
A
|
2.06
|
|
AB Discoaster triradiatus
|
|
A
|
2.135–2.216*
|
|
LO Discoaster pentaradiatus
|
NN18
|
C
|
2.393–2.512*
|
|
LO Discoaster surculus
|
NN17
|
C
|
2.52
|
|
LO Discoaster tamalis
|
|
C
|
2.87
|
|
LO Sphenolithus spp.
|
|
C
|
3.65
|
|
LO Reticulofenestra pseudoumbilicus (>7 µm)
|
NN16
|
A
|
3.79
|
|
FCO Discoaster asymmetricus
|
NN15–NN14
|
B
|
4.13
|
|
LO Amaurolithus primus
|
|
|
4.50
|
|
LO Ceratolithus acutus
|
|
B
|
5.04
|
|
FO Ceratolithus rugosus
|
NN13
|
D
|
5.12
|
|
LO Triquetrorhabdulus rugosus
|
|
|
5.279*
|
|
FO Ceratolithus acutus
|
|
B
|
5.32
|
|
LO Discoaster quinqueramus
|
NN12
|
A
|
5.59
|
|
LO Nicklithus amplificus
|
|
A
|
5.978–5.939*
|
|
FO Nicklithus amplificus
|
|
C
|
6.909–6.684*
|
|
PE Reticulofenestra pseudoumbilicus (>7 µm)
|
|
D
|
7.077–7.167*
|
|
FO Amaurolithus spp./Amaurolithus primus
|
NN11b
|
A
|
7.362–7.424*
|
|
FCO Discoaster surculus
|
|
B
|
7.88
|
|
LCO Minylitha convallis
|
|
D
|
7.78–8.3
|
|
FO Discoaster berggrenii
|
NN11a
|
D
|
8.52
|
|
PB Reticulofenestra pseudoumbilicus (>7 µm)
|
NN10b
|
A
|
8.785–8.761*
|
|
FO Discoaster pentaradiatus
|
|
|
9.1
|
|
FO Minylitha convallis
|
|
D
|
9.416
|
|
LO Discoaster hamatus
|
NN10a
|
C
|
9.560
|
|
LO Catinaster calyculus
|
|
D
|
9.674*
|
|
LO Catinaster coalitus
|
|
D
|
9.687*
|
|
X Discoaster hamatus–D. neohamatus
|
|
|
9.762*
|
|
FO Discoaster neohamatus
|
|
C
|
9.867–10.521*
|
|
LCO Discoaster exilis
|
|
|
10.427
|
|
FO Discoaster hamatus
|
NN9
|
C
|
10.541
|
|
LO Coccolithus miopelagicus
|
|
C
|
10.613
|
|
FO Discoaster calcaris
|
|
|
10.676
|
|
FO Discoaster bellus gr.
|
|
C
|
10.72
|
|
FO Discoaster brouweri
|
|
A
|
10.734–10.764*
|
|
FO Catinaster calyculus
|
|
D
|
10.785*
|
|
FO Catinaster coalitus
|
NN8
|
D
|
10.886–10.733*
|
|
LCO Discoaster kugleri
|
|
A
|
11.578–11.596*
|
|
FCO Discoaster kugleri
|
NN7
|
B
|
11.863–11.905*
|
|
LO Cyclicargolithus floridanus
|
|
D
|
12.037
|
|
LO Coronocyclus nitescens
|
|
|
12.254
|
|
LCO Calcidiscus premacintyrei
|
|
A
|
12.447
|
|
FCO Triquetrorhabdulus rugosus
|
|
|
12.671
|
|
LCO Cyclicargolithus floridanus
|
|
A
|
13.294
|
|
LO Sphenolithus heteromorphus
|
NN6
|
C
|
13.532–13.654*
|
|
LO Helicosphaera ampliaperta
|
NN5
|
|
14.914*
|
|
AE Discoaster deflandrei
|
|
|
15.663*
|
|
FO Discoaster signus
|
|
|
15.702*
|
|
FCO Sphenolithus heteromorphus
|
|
|
17.721*
|
|
LCO Sphenolithus belemnos
|
NN4
|
|
17.973*
|
|
LO Triquetrorhabdulus carinatus
|
|
D
|
18.315*
|
|
FO Sphenolithus belemnos
|
NN3
|
|
18.921*
|
|
FO Helicosphaera ampliaperta
|
|
|
20.393*
|
|
X Helicosphaera euphratis–Helicosphaera carteri
|
|
|
20.894*
|
|
FCO Helicosphaera carteri
|
|
|
21.985*
|
|
LCO Triquetrorhabdulus carinatus
|
|
|
22.092
|
|
FO Sphenolithus disbelemnos
|
|
C
|
22.413
|
|
FO Discoaster druggii
|
NN2
|
D
|
22.824*
|
|
LO Sphenolithus delphix
|
|
A
|
23.089
|
|
FO Sphenolithus delphix
|
|
A
|
23.356
|
|
LO Sphenolithus ciperoensis
|
NN1
|
C
|
24.389
|