Table T7. Age assignments to bottom and top of the observed ranges of calcareous nannofossil species.
| Index Fossil | Nannofossil datums |
Age (Ma) |
|---|---|---|
Emiliania huxleyi |
B |
0.26 |
Psuedoemiliania lacunosa |
T |
0.46 |
Helicosphaera sellii |
T |
1.47 |
Discoaster brouwerii |
T |
1.95 |
Discoaster pentaradiatus |
T |
2.55 |
Reticulofenestra pseudoumbilicus |
T |
3.75 |
Sphenolithus abies/neoabies |
T |
3.75 |
Triquetrorhabdulus rugosus |
T |
5.34 |
Discoaster quinqueramus |
T |
5.6 |
Discoaster loeblichii |
T |
7.4 |
Discoaster berggrenii |
B |
8.6 |
Discoaster loeblichii |
B |
8.7 |
Discoaster hamatus |
T |
9.4 |
Discoaster hamatus |
B |
10.7 |
Coccolithus miopelagicus |
T |
10.8 |
Discoaster kugleri |
T |
11.5 |
Discoaster kugleri |
B |
11.8 |
Cyclicargolithus floridanus |
T |
11.8 |
Sphenolithus heteromorphus |
T |
13.6 |
Helicosphaera ampliaperta |
T |
15.6 |
Sphenolithus heteromorphus |
B |
18.2 |
Notes: B = bottom; T = top. Datums and ages are from Berggren et al. (1995a, 1995b).