[coccoliths] KN zonation

[Richard Howe]

Hi Jeremy,

It’s from Bergen & Sikora (1999). The citation is:

Bergen, J. A. & Sikora, P.J., 1999. Microfossil diachronism in southern Norwegian North Sea chalks: Valhall and Hod fields. Geological Society, London, Special Publications 152 (1999): 111 - 85.

I don’t have a copy of the paper, but managed to find a copy of the figure with the KN zonation online.

Cheers,

Rich

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> On Mar 26, 2025, at 5:26 PM, Young, Jeremy <jeremy.young at ucl.ac.uk> wrote:
> 
> Hi
> In TimeScaleCreator there is KN nannofossil zonation for the Late Cretaceous, with zones from KN1 at the top of the Maastrichtain to KN40 in Cenomanian.  However, I can't find this zonation anywhere else. Does anyone know where it comes from, and if it has any continuing value?
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