Biostratigraphic analysis of the K/Pg boundary using calcareous Nannofossil from Sulaimani area, Kurdistan Region, Iraq


  • Soran Osman Abdullah University of Sulaimani


Earth & Environment


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 show 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 Sulaimani area of Kurdistan were focused. 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. Additional important biostratigraphic marker is plus an acme of Thoracosphaera operculata of biozone NP1 above biozone CC26 which is generally consisted of Micula murus, Micula Prinsii and Lithraphidites quadratus. This biostratigraphic analysis indicates no hiatus, although it shows reworked Cretaceous taxa are recorded above the K/Pg boundary within zones NP1 and NP2.

Author Biography

Soran Osman Abdullah, University of Sulaimani

Deparment of Geology, College of Science

University of Sulaimani,


Kurdistan Regional Government/Iraq


David K. Watkins

Department of Earth & Atmospheric Sciences

Bessey Hall

University of Nebraska

Lincoln, Nebraska 68588-0340




Emma Sheldon

Department of Stratigraphy, Geological Survey of Denmark & Greenland,

Øster Voldgade 10, DK-1350,

Copenhagen K, Denmark;


Giuliana Villa

Università degli Studi di Parma; Parco Area delle Scienze, 1

A; 43124 Parma, Italy


Emanuela Mattioli

Laboratoire de Géologie de Lyon; Terre, Planètes, Environnement;

UMR 5276 CNRS; Observatoire de Lyon;

Université Lyon 1; France


Jarrett Cruz

Earth, Ocean and Atmospheric Science, Florida State University, P.O. Box 3064520, Tallahassee, FL 32306-4520



Kyoko Hagino*

Kyoko Hagino: Kochi Core Center, Kochi University, Monobe-Otsu 200, Nankoku, Kochi, 783-0093 Japan








Earth & Environment