Biostratigraphy of the Cretaceous/ Paleogene boundary in the Chahardeh section (Izeh zone, Khuzestan province)

In order to study of Cretaceous/ Paleogene (K/Pg) boundary in the Izeh zone-Chahardeh section, 100m of sediments at the top of Gurpi Formation are collected during geological sampling. These sediments mainly consist of green shale and marl of Gurpi Formation. On the basis of the identified planktonic foraminiferal assemblages, six biozones are recorded:- Plummerita hantkenoides Zone (CF1), (Late Maastrichtian)- Guembelitria cretacea Partial-range Zone (P0), (Danian)- Parvularugoglobigerina eugubina Taxon-range Zone (Pα), (Danian)- Eoglobigerina edita Partial-range Zone (P1), (Danian)- Praemurica uncinata Lowest-occurrence Zone (P2), (Danian)- Morozovella angulata Lowest-occurrence Zone (P3), (Danian-Selandian)Based on above mentioned biozones, the Cretaceous/ Paleogene (K/Pg) boundary in this section located on 79m lower than Pabdeh/Gurpi Formations boundary. The biostratigraphic correlations based on planktonic foraminiferal zonations showed a comparison between the biostratigraphic zones established in this study and other equivalents of the commonly used planktonic zonal scheme around the Cretaceous/ Paleogene boundary in Tethys.