[coccoliths] KN zonation

[Bryan Ladner]

I think that Bergen and Sikora worked this zonation up primarily for use in
oil exploration. Given that the biostrat is worked from the top down as the
well is being drilled then I think that this is perfectly useful for the
task it's intended for.

On Fri, Mar 28, 2025 at 3:53 AM Ines Galović <inesgalovic at gmail.com> wrote:

> 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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-- 
Bryan C. Ladner
Tel:  228 806 9157
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