Biostratigraphic analysis of the KPg boundary using calcareous nannofossils from the Sulaimani Area, Kurdistan Region, Iraq

Abstract EN

The Cretaceous/Paleogene boundary in the Kurdistan region of Iraq in general is still debatable; however, examination of the boundary at the qalbaza and dartw localities in the Sulaimani area of the Kurdistan region shows different results regarding the biostratigraphy of the boundary zone.

in the current study, the calcareous nannofossil assemblages and biostratigraphy across the K/Pg boundary in the Sulaimani area of Kurdistan were focused on.

the rock strata in the study sections are characterized by alternations of organic shale, siltstone, fine-grained sandstone, gravel and organic limestone interlayers within the tanjero formation (Late Maastrichtian) and the overlying Kolosh Formation (Paleocene-early Eocene).

the boundary is biostratigraphically delineated by the first occurrences of biantholithus sparsus, cruciplacolithus spp.

and coccolithus pelagicus.

an additional important biostratigraphic marker is plus an acme of thoracosphaera operculata of biozone NP1 above biozone CC26 which generally consisted of Micula murus, micula prinsii and lithraphidites quadratus.

this biostratigraphic analysis indicates no hiatus, although it shows that reworked Cretaceous taxa are recorded above the K/Pg boundary within zones NPI and NP2.