[coccoliths] KN zonation

[Ines Galović]

To all, I believe younger colleagues or maybe biologists, if you want your
biostratigraphy to be useful, I suggest following some biostratigraphic
basic rules such as  "Biostratigraphic units are distinct from other kinds
of stratigraphic units in that the organisms whose fossil remains define
them show *evolutionary changes through geologic time...*". It means
labeling the zones from older (1) to younger (41), not in reverse order,
please.
Cheers,
Ines🌷


On Thu, 27 Mar 2025 at 12:26, Nicolas Rudolph Thibault <nt at ign.ku.dk> wrote:

> 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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