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