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 -------------- next part -------------- A non-text attachment was scrubbed... Name: smime.p7s Type: application/pkcs7-signature Size: 1484 bytes Desc: not available URL: <http://webmail.fcnym.unlp.edu.ar/pipermail/coccoliths/attachments/20250326/50514df8/attachment.bin>