Calcareous nannofossil datum | Age (Ma) | Depth (m) | Martini’s zonation boundary |
LO Sphenolithus abies | 3.65 | 109.73 | NN16 |
LO Reticulofenestra pseudoumbilicus | 3.79 | 265.18 | NN15/NN16 |
FO Pseudoemiliania lacunosa | 4 | 457.2 | NN14/NN15 |
LO Discoaster quinqueramus | 5.59 | 632.46 | NN11/NN12 |
LO Discoaster berrgrenii | 5.59 | 632.46 | NN11/NN12 |
Top of small Reticulofenestra Interval | 7.167 | 1135.38 | NN11 |