[coccoliths] KN zonation

[Nicolas Rudolph Thibault]

Hi Jeremy,

This is coming from the following reference:

Bergen, J.A., Sikora, P.J., 1999. Microfossil diachronism in southern Norwegian North Sea chalks: Valhall and Hod fields, in: Jones, R.W., Simmons, M.D. (Eds.), Biostratigraphy in Production and Development Geology. Geological Society of London Special Publications 152, Geological Society, London, pp. 85-111.

It is somewhat useful for the North Sea, though mostly with similar events as used in the UC(BP) and UC ('i') zonations

I attach the paper hereby.

Cheers,
Nic
-----Original Message-----
From: Coccoliths <coccoliths-bounces at fcnym.unlp.edu.ar> On Behalf Of Young, Jeremy
Sent: 26. marts 2025 23:26
To: Coccoliths at fcnym.unlp.edu.ar
Subject: [coccoliths] KN zonation

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?
Jeremy
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