New Biochronological Scales of Planktic Foraminifera for the Early Danian Based on High-Resolution Biostratigraphy

After the Cretaceous/Paleogene boundary (KPB) catastrophic mass extinction event, an explosive evolutionary radiation of planktic foraminifera took place in consequence prompt occupation empty niches. The rapid evolution new species makes it possible to establish high-resolution biozonations lower Danian. We propose two biostratigraphic scales for low-to-middle latitudes spanning first million years is based on qualitative data and includes four biozones: Guembelitria cretacea Zone (Dan1), Parvularugoglobigerina longiapertura (Dan2), eugubina (Dan3), Parasubbotina pseudobulloides (Dan4). latter are divided into several sub-biozones: sabina Subzone (Dan3a) Eoglobigerina simplicissima (Dan3b) Pv. Zone, Praemurica taurica (Dan4a), Subbotina triloculinoides (Dan4b), Globanomalina compressa (Dan4c) P. Zone. second scale quantitative three acme-zones (abundance zones): Acme-zone (DanAZ1), Parvularugoglobigerina-Palaeoglobigerina (DanAZ2), Woodringina-Chiloguembelina (DanAZ3). Both samplings most continuous sections Danian worldwide have been calibrated with recent magnetochronological astrochronological dating.