Planktonic Foraminiferal Biostratigraphy and Correlation Across the Cretaceous-Paleogene Transition at the Tethyan and the Atlantic Realms

[摘要] Based on high-resolution planktonic foraminiferalbiostratigraphical analysis at El Kef stratotype section (GSSP forthe K/Pg boundary), Ellès section in Tunisia, andAgost and Caravacasections in Spain (Tethyan realm), we attempt to compare biozonesand subzones with those of the Bidart section (SW France)(Atlantic realm). TheAbathomphalus mayaroensiszone of the upperMaastrichtian corresponds to the taxon range interval of thenominate species. We have identified thePlummerita hantkeninoidessubzone. This species is present and associated withPseudoguembelina hariaensisat the Tethyan realm. However, thisspecies is absent at the middle latitude of the Atlantic realm (Bidartsection, SW France). ThePseudoguembelina hariaensisspecies hadlarger paleogeographic spread, as it was present in both theTethys and the Atlantic paleoceans. It is more relevant to beconsidered as the biomarker of a nominate uppermost Maastrichtiansubzone instead ofPlummerita hantkeninoides. The Danian stage ischaracterized by theGt. cretaceazone,Pv. eugubinazone, and theParasubbotina pseudobulloideszone. The deposition thickness ofthe zones and subzones at El Kef stratotype section and Ellèssection is more expanded than at Agost and Caravaca sections (Spain)and Bidart section (France). They would be controlled by thesedimentary basin morphology.

[学科分类] 生物技术