High-resolution biostratigraphic zonation across the Cretaceous/Paleogene (K/Pg) boundary from the Sulaymaniyah area, Kurdistan Region, Northeastern Iraq

  • Imad M. Ghafor Department of Earth Sciences and Petroleum, College of Science, University of Sulaimani, Sulaymaniyah, Kurdistan Region – F.R. Iraq https://orcid.org/0000-0002-9410-7647
  • Asaad I. Mustafa Department of Earth Sciences and Petroleum, College of Science, University of Sulaimani, Sulaymaniyah, Kurdistan Region – F.R. Iraq https://orcid.org/0000-0003-3247-3104
  • Ibrahim M. Mohialdeen Department of Earth Sciences and Petroleum, College of Science, University of Sulaimani, Sulaymaniyah, Kurdistan Region – F.R. Iraq https://orcid.org/0000-0003-4544-3959
  • Howri Mansurbeg (1) Department of Geology, Palacký University, 17, listopadu 12, Olomouc 77146, Czechia; (2) General Directorate of Scientific Research Center, Salahaddin University-Erbil, Erbil 44002, Kurdistan Region – F.R. Iraq https://orcid.org/0000-0002-3089-133X
Keywords: High Resolution, K/Pg boundary, Kurdistan region of Iraq, Planktic Foraminifera


The present study interprets the high resolution of the biostratigraphy across the Cretaceous/Paleogene (K/Pg) boundary from Sulaymaniyah, Kurdistan Region, and north-east Iraq, based on planktic foraminifera. The Dartw section was selected for this study, within the High Folded Zone. The biozone contact consists of lithostratigraphic resemblance and is represented by the upper part of the Tanjero Formation (late Maastrichtian) with the overlying Kolosh Formation (Danian). Four late Maastrichtian planktic foraminiferal biozones have been recorded from the Tanjero Formation: Racemiguembelina fructicosa Interval Zone (CF4), Pseudoguembelina hariaensis Concurrent Range Zone (CF3),Pseudoguembelina palpebra Partial Range Zone (CF2), and Plummerita hantkeninoides Total Range Zone (CF1), while three Danian planktic foraminiferal biozones and two subzones have been recorded from the Kolosh Formation: (Guembelitria cretacea (P0) Interval Zone, Parvularugoglobigerina eugubina (Pα) Total Range Zone, and Parasubbotina pseudobulloides (P1) Partial-Range Zone (Globoanomalina archaeocompressa (P1a) Partial Range Subzone, and Subbotina triloculinoides (P1b) Interval Subzone). High biostratigraphic resolution indicates a complete K/Pg transition with no hiatus at the studied section in the Sulaymaniyah area. The ranges of the species recognized in this study are given. Correlations with other sections in Iraq and other parts of the world, including the typeMaastrichtian and Danian areas, are discussed and represented in correlation charts, together with the ranges of the important Upper Maastrichtian and Paleocene species.


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Author Biographies

Imad M. Ghafor, Department of Earth Sciences and Petroleum, College of Science, University of Sulaimani, Sulaymaniyah, Kurdistan Region – F.R. Iraq

Imad M. Ghafor is a Professor at the Department of Earth Sciences and Petroleum, College of Science, University of Sulaimani. He got the B.Sc. degree in University of Sulaimani, Iraq, the M.Sc. degree in Salahaddin University-Erbil, iraq, and the Ph.D. degree in University of Sulaimani, Iraq. His research interests are in paleontology, micropaleontology, biostratigraphy, paleoecology and microfacies.

Asaad I. Mustafa, Department of Earth Sciences and Petroleum, College of Science, University of Sulaimani, Sulaymaniyah, Kurdistan Region – F.R. Iraq

Asaad I. Mustafa is assistant lecturer at the Department of Earth Sciences and Petroleum, College of Science, University of Sulaimani, Iraq. He got the B.Sc degree in University of Sulaimani, and M.Sc in University of Sulaimani. His research interests are in geochemistry of sedimentary rocks and clay mineralogy. Asaad is a member of Kurdistan Geological Society since 2011.

Ibrahim M. Mohialdeen, Department of Earth Sciences and Petroleum, College of Science, University of Sulaimani, Sulaymaniyah, Kurdistan Region – F.R. Iraq

Ibrahim M.J. Mohialdeen, is Professor at the Department of Earth Sciences and Petroleum, College of Science, University of Sulaimani. He got the B.Sc and M.Sc. degrees from Salahaddin University-Erbil, Iraq. His research interests are in petroleum geochemistry, and organic petrology of Late Cretaceous rocks, as well as the medical geology. Dr. Ibrahim is a member of Member of Iraqi Geological Society since 1989, member of Kurdistan Geological Society since1992, and member of the Berriasian Working Group, ISCS, since 2012.

Howri Mansurbeg, (1) Department of Geology, Palacký University, 17, listopadu 12, Olomouc 77146, Czechia; (2) General Directorate of Scientific Research Center, Salahaddin University-Erbil, Erbil 44002, Kurdistan Region – F.R. Iraq

Howri Mansurbeg is a Professor of Geosciences at the Department of Quality Assurance & Curriculum Development, Salahaddin University-Erbil. He got his B.Sc. degree in Salahaddin University-Erbil, his M.Sc. degree in Lund University, and his Ph.D. degree in Uppsala University. His research interests include reservoir geology, diagenesis, petroleum geology, and sedimentary petrology.


Abawi, T.S., Kireem, M.R.A., and Yousef, J.M., 1982. Planktonic foraminiferal stratigraphy of Shiranish formation, Sulaimaniah-Dokan region, northeastern Iraq. Revista Espanola de Micropaleontologia, 14(1), pp.153-164.

Abdel-Kireem, M.R., 1986. Contribution to the stratigraphy of the upper Cretaceous and the lower tertiary of the Sulaimaniah-Dokan region, northeastern Iraq. Neues Jahrbuch für Geologie und Paläontologie-Abhandlungen, 172, pp.121-139. DOI: https://doi.org/10.1127/njgpa/172/1997/121

Abramovich, S., and Keller, G., 2002. High stress late Maastrichtian paleoenvironment: Inference from planktonic foraminifera in Tunisia. Palaeogeography, Palaeoclimatology, Palaeoecology, 178(3-4), pp.145-164. DOI: https://doi.org/10.1016/S0031-0182(01)00394-7

Ahmed, S.H., Qadir, B.O., and Müller, C., 2015. Age determinations of cretaceous sequences based on calcareous nannofossils in Zagros Thrust and Folded Zone in Kurdistan Region-Iraq. Journal of Zankoy Sulaimani-Part A (JZS-A), 17(3), pp.185-196. DOI: https://doi.org/10.17656/jzs.10412

Al-Barzinjy, S.T.M., 2005. Stratigraphy and Basin Analysis of Red Bed Series from Northeastern Iraq, Kurdistan Region, Unpublished Ph.D. Thesis. University of Sulaimani University, Iraq, p.159.

Al-Khalaif, S., and Al-Mutwali, M., 2020. Biostratigraphy and sequence stratigraphy and depositional environment of Kolosh formation in Dohuk Area, Northern Iraq. Iraqi National Journal of Earth Science, 20(2), pp.18-42. DOI: https://doi.org/10.33899/earth.2020.170362

Al-Mashaikie Sa’ad, Z., and Mohammed, I.J., 2018. New discovery of olivine/pyroxene-rich sandstones in the Kolosh formation, Dyana Area, NE Iraq: An approach to provenance and tectonics of the sedimentary basin. Iraqi Bulletin of Geology and Mining, 14(2), pp.81-96.

Al-Mutwali, M.M., and AL-Doori, M.A., 2012. Planktonic foraminiferal biostratigraphy of Shiranish formation in Dohuk area/northern Iraq. Iraqi National Journal of Earth Science, 12(3), pp.17-40. DOI: https://doi.org/10.33899/earth.2012.64522

Al-Nuaimy, Q.A.M., Sharbazheri, K.M.I., Karim, K.H., and Ghafor, I.M., 2020. Cretaceous/paleogene boundary analysis by planktic foraminiferal biozonation in the Western Zagros fold-thrust belt (Smaquli valley), Sulaimani Governorate, NE-Iraq. Kirkuk University Journal, Scientific Studies, 15(3), pp.45-81. DOI: https://doi.org/10.32894/kujss.2020.15.3.3

Al-Qayim, B., and Al-Shaibani, S., 1989. Stratigraphic analysis of Cretaceous-Tertiary contact, Northwest Iraq. Journal of Geological Society, 22(1), pp.41-52.

Al-Qayim, B., Omer, A., and Koyi, H., 2012. Tectonostratigraphic overview of the Zagros suture zone, Kurdistan region, Northeast Iraq. GeoArabia, 17(4), pp.109-156. DOI: https://doi.org/10.2113/geoarabia1704109

Al-Qayim, B.A., Kharajiany, S.O.A., and Wise, S.W. Jr., 2020. Biostratigraphic analysis of the K/Pg boundary using calcareous nannofossil from Sulaimani area, Kurdistan Region, Iraq. Kuwait Journal of Science, 47(4), pp.92-105.

Al-Shaibani, S.K., Al-Hashimi, H.A., and Ghafor, I.M., 1993. Biostratigraphy of the cretaceous-tertiary boundary in well Tel-Hajer No-1, Sinjar Area, Northwest Iraq. Iraqi Geological Journal, 26(2), pp.77-97.

Alth, A., 1850. Geognostisch-palaeontologische Beschreibung der nächsten Umgebung von Lemberg. Haidinger's Naturwissenschftliche Abhandlungen, 3(2), pp.171-284.

Alvarez, L.W., Alvarez, W., Asaro, F., and Michel, H.V., 1980. Extraterrestrial cause for the Cretaceous-tertiary extinction. Science, 208(4448), pp.1095-1108. DOI: https://doi.org/10.1126/science.208.4448.1095

Alvarez, W., Claeys, P., and Kieffer, S.W., 1995. Emplacement of Cretaceous-tertiary boundary shocked quartz from Chicxulub crater. Science, 269(5226), pp.930-935. DOI: https://doi.org/10.1126/science.269.5226.930

Arenillas, I., Alegret, L., Arz, J.A., Liesa, C., Meléndez, A., Molina, E., Soria, A.R., Cedillo-Pardo, E., Grajales-Nishimura, J.M., and Rosales-Domínguez, C., 2002. Cretaceous-tertiary boundary planktic foraminiferal mass extinction and biochronology at La Ceiba and Bochil, Mexico, and El Kef, Tunisia. Special Papers. Geological Society of America, United States, pp.253-264. DOI: https://doi.org/10.1130/0-8137-2356-6.253

Arenillas, I., Arz, J.A., Molina, E., and Dupuis, C., 2000. The Cretaceous/paleogene (K/P) boundary at Aïn Settara, Tunisia: Sudden catastrophic mass extinction in planktic foraminifera. The Journal of Foraminiferal Research, 30(3), pp.202-218. DOI: https://doi.org/10.2113/0300202

Arenillas, I., Belhai, D., Arz, J.A., Metsana-Oussaid, F., and Gilabert, V., 2022. Hypothesis testing on the planktic foraminiferal survival model after the KPB mass extinction: Evidence from Tunisia and Algeria. Fossil Record, 25, pp.43-63. DOI: https://doi.org/10.3897/fr.25.79958

Bakkal, K.K., Ghafor, I.M., and Kassab, I.I.M., 1993. Biostratigraphy of shiranish formation in Hijran area northeastern Iraq. Journal of Science and Nature, 2(2), pp.34-39.

Bamerni, A., Al-Qayim, B., Hammoudi, R.A., and Frontalini, F., 2021. High-resolution biostratigraphic analysis of the cretaceous-paleogene boundary in the Kurdistan region (NW Iraq). Stratigraphy, 18(4), pp.251-268. DOI: https://doi.org/10.29041/strat.18.4.02

Bamerni, A., Al-Qayim, B.A., and Hammoudi, R.A., 2020. High resolution biostratigraphic analysis of the Danian stage, per fat section, Duhok Area, Kurdistan Region, North of Iraq. The Iraqi Geological Journal, 53, pp.113-126. DOI: https://doi.org/10.46717/igj.53.2B.6Rs-2020-09/06

Bellen, R.C., Dunnington, H.V., Wetzel, R., and Morton, D.M., 1959. Lexique stratigraphic international Asia, Iraq, Congress Geol. International Commission de Stratigraphique, 3, p.333.

Belza, J., Goderis, S., Montanari, A., Vanhaecke, F., and Claeys, P., 2017. Petrography and geochemistry of distal spherules from the K-Pg boundary in the Umbria-Marche region (Italy) and their origin as fractional condensates and melts in the Chicxulub impact plume. Geochimica et CosmochimicaActa, 202, pp.231-263. DOI: https://doi.org/10.1016/j.gca.2016.12.018

Berggren, W.A., and Miller, K.G., 1988. Paleogene tropical planktonic foraminiferal biostratigraphy and magnetobiochronology. Micropaleontology, 34, pp.362-380. DOI: https://doi.org/10.2307/1485604

Berggren, W.A., Kent, D.V, Swisher, C.C., and Aubry, M.P., 1995. A revised Cenozoic geochronology and chronostratigraphy. In: Berggren, W.A., Kent, D.V., Aubry, M.A., and Hardenbol, J., eds. Geochronology, Time Scales and Global Stratigraphic Correlation. Society for Sedimentary Geology, Lynn Riggs Blvd. DOI: https://doi.org/10.2110/pec.95.04.0129

Blow, W.H., 1979. The Cenozoic Globigerinidae, Vol. 1-3, Brill Publishers, Leiden, Netherlands, p1413, p264.

Bolli, H., 1951. The genus Globotruncana in Trinidad, BWI: Notes on occurrence, nomenclature and relationships between species. Journal of Paleontology, 25, pp.187-199.

Bolli, H.M., 1966. Zonation of Cretaceous to Pliocene Marine Sediments Based on Planktonic Foraminifera. Geologisches Institut der Eidg, Technischen Hochschule und der Universität, Berlin.

Bonté, P., Delacotte, O., Renard, M., Laj, C., Boclet, D., Jehanno, C., and Rocchia, R., 1984. An iridium rich layer at the Cretaceous/Tertiary boundary in the Bidart section (Southern France). Geophysical Research Letters, 11(5), pp.473-476. DOI: https://doi.org/10.1029/GL011i005p00473

Brönnimann, P.T., 1952. Globigerinidae from the upper cretaceous (Cenomanian-Maestrichtian) of Trinidad, B.W.I. Bulletin of American Paleontology, 34, pp.5-71.

Canudo, J.I., Keller, G., and Molina, E., 1991. Cretaceous/Tertiary boundary extinction pattern and faunal turnover at Agost and Caravaca, SE Spain. Marine Micropaleontology, 17(3-4), pp.319-341. DOI: https://doi.org/10.1016/0377-8398(91)90019-3

Caron, M., 1985. Cretaceous planktic foraminifera. In: Bolli, H.M., Saunders, J.B., and Perch Nielsen, K., eds. Plankton Stratigraphy. Cambridge University Press, Cambridge, pp.17-86.

Carsey, D.O., 1926. Foraminifera of the Cretaceous of Central Texas. Bulletin No 2612. University of Texas, Austin, pp.1-56.

Chacon, B., and Martín-Chivelet, J., 2005. Major palaeoenvironmental changes in the Campanian to Palaeocene sequence of Caravaca (Subbetic zone, Spain).Journal of Iberian Geology, 31(2), pp.299-310.

Coccioni, R., and Premoli Silva, I., 2015. Revised upper Albian-Maastrichtian planktonic foraminiferal biostratigraphy and magneto-stratigraphy of the classical Tethyan Gubbio section (Italy). Newsletters on Stratigraphy, 48(1), pp.47-90. DOI: https://doi.org/10.1127/nos/2015/0055

Courtillot, V., Besse, J., Vandamme, D., Montigny, R., Jaeger, J.J., and Cappetta, H., 1986. Deccan flood basalts at the Cretaceous/Tertiary boundary? Earth and Planetary Science Letters, 80(3-4), pp.361-374. DOI: https://doi.org/10.1016/0012-821X(86)90118-4

Cushman, J.A., 1926. Some foraminifera from the Mendez Shale of Eastern Mexico. Contributions from the Cushman Laboratory for Foraminiferal Research, 2(1), pp.16-26.

Cushman, J.A., 1933. Some new foraminiferal genera. Contributions from the Cushman Laboratory for Foraminiferal Research, 9(2), pp.32-38.

Cushman, J.A., 1938. Cretaceous species of Guembelina and related genera. Contributions from the Cushman Laboratory for Foraminiferal Research, 14(1), pp.2-28.

Dalbiez, F., 1955. The Genus Globotruncana in Tunisia. Micropaleontology, 1(2), p.161.De Klasz, I., 1953. Einige neue oder wenig bekannte Foraminiferen aus der helvetischen Oberkreide der bayerischen Alpen, südlich Traunstein (Oberbayern). Geologica Bavarica, 17, pp.223-244. DOI: https://doi.org/10.2307/1484170

Egger, J.G., 1899. Foraminiferen und Ostrakoden Aus den Kreidemergeln der Oberbayerischen Alpen. Vol. 21. Germany: Verlag der K. Akademie.Ehrenberg, C.G., 1840. Uber die Bildung der Kreidefelsen und des Kreidemergels Durch Unsichtbare Organismen. Physikalische Abhandlungen der Koniglichen Akademie der Wissenschaften zu Berlin, pp.59-147.

El Naggar, Z.R., 1966. Stratigraphy and Planktonic Foraminifera in the Upper Cretaceous-Lower Tertiary Succession in the Esna-Idfu Region. Bulletin No 2. British Museum of Natural History, Nile Valley, Egypt, UAR, p.291. DOI: https://doi.org/10.5962/p.310410

Elnady, H., and Shahin, A., 2001. Planktonic foraminiferal biostratigraphiy and paleobathymetry of the late cretaceous-early tertiary succession at northeast Sinai, Egypt. Egypt Journal Paleontology, 1, pp.193-227.

Font, E., Adatte, T., Sial, A.N., De Lacerda, L.D., Keller, G., and Punekar, J., 2016. Mercury anomaly, Deccan volcanism, and the end-Cretaceous mass extinction. Geology, 44(2), pp.171-174. DOI: https://doi.org/10.1130/G37451.1

Gandolfi, R., 1955. The genus Globotruncana in Northeastern Colombia. Bulletins of American Paleontology, 36, pp.7-118.

Ghafor, I.M., 1988. Planktonic Foraminifera and Biostratigraphy of the Aaliji Formation and the Nature of its Contact with the Shiranish Formation in Well Tel-Hajar No. 1. Sinjar Area, Northwestern Iraq. Unpublished. Thesis. Department of Geology, Salahaddin University, Iraq. DOI: https://doi.org/10.1127/njgpm/1988/1988/391

Ghafor, I.M., 2000. Spores and pollen of upper cretaceous lower tertiary in Higran area, Kurdistan, Iraq. Zanco Journal of Pure and Applied Science, 12(2), 47-62.

Govindan, A., Ravindran, C.N., and Rangaraju, M.K., 1996. Cretaceous stratigraphy and planktonic foraminiferal zonation of the Cauvery basin, South India. Memoirs of the Geological Society of India, 37, pp.155-188.

Hammoudi, R., 2011. High resolution biostratigrahpy of the K/T boundary in the Higran Section, Shaqlawa Area, Northern Iraq. Iraqi National Journal of Earth Science, 11(1), pp.23-48. DOI: https://doi.org/10.33899/earth.2011.5499

Hildebrand, A.R., Boynton, W.V., and Zoller, W.H., 1984. Rhenium enriched Kilauea volcano aerosols: Evidence for a volcanogenic component in the K/T boundary clay layer. Bulletin of the American Astronomical Society, 16, p.679.

Hildebrand, A.R., Penfield, G.T., Kring, D.A., Pilkington, M., Camargo Z, A., Jacobsen, S.B., and Boynton, W.V., 1991. Chicxulub crater: A possible Cretaceous/Tertiary boundary impact crater on the Yucatan Peninsula, Mexico. Geology, 19(9), pp.867-871. DOI: https://doi.org/10.1130/0091-7613(1991)019<0867:CCAPCT>2.3.CO;2

Ismael, K.M., Khanaqa, P.A., and Karim, K.H., 2011. Biostratigraphy of Bluish Marl Succession (Maastrichtian) in Sulaimanyia, Area, Kurdistan Region NE-Iraq. Iraqi National Journal of Earth Science, 11(2), pp.81-99. DOI: https://doi.org/10.33899/earth.2011.5552

Jassim, S.Z., and Goff, J.C., 2006. Geology of Iraq. Dolin, Sro, Distributed by Geological Society of London,

Brno.Jaza, I.M., 1992. Sedimentary Facies Analysis of the Tanjero Formation in Sulaimaniya District, NE-Iraq. Unpublished. M.Sc. Thesis. Salahaddin University, Erbil, p.121.

Karim, K.H., 2004. Basin analysis of Tanjero Formation in Sulaimaniya area, NE-Iraq, Unpublished. PhD. Thesis. Sulaimani University, Erbil, p135.

Karim, K.H., and Hamza, B.J., 2023. Relation between Walash and Kolosh Formations and geology of their equivalent metamorphosed greywackes and arenites in Sulaimaniyah Governorate, Kurdistan Region, Northeast Iraq. Tikrit Journal of Pure Science, 28(6), pp.122-145. DOI: https://doi.org/10.25130/tjps.v28i6.1598

Kassab, I.I.M., 1972. Micropaleontology of the Upper Cretaceous to Lower Tertiary of Northern Iraq. Unpublished Ph. D. Thesis, University of London, p.310.

Keller, G., 1988. Extinction, survivorship and evolution of planktic foraminifera across the Cretaceous/Tertiary boundary at El Kef, Tunisia. Marine Micropaleontology, 13(3), pp.239-263. DOI: https://doi.org/10.1016/0377-8398(88)90005-9

Keller, G., 2003. Guembelitria-dominated late Maastrichtian planktic foraminiferal assemblages mimic early Danian in central Egypt. Marine Micropaleontology, 47(1-2), pp.71-99. DOI: https://doi.org/10.1016/S0377-8398(02)00116-0

Keller, G., 2014. Deccan volcanism, the Chicxulub impact, and the end-Cretaceous mass extinction: Coincidence? Cause and effect. In: Geological Society of America Special Papers. Vol. 505, pp.57-89. DOI: https://doi.org/10.1130/2014.2505(03)

Keller, G., and Pardo, A., 2004. Disaster opportunists Guembelitrinidae: Index for environmental catastrophes. Marine Micropaleontology, 53(1-2), pp.83-116. DOI: https://doi.org/10.1016/j.marmicro.2004.04.012

Keller, G., Li, L., and MacLeod, N., 1996. The cretaceous/tertiary boundary stratotype section at El Kef, Tunisia: How catastrophic was the mass extinction? Palaeogeography, Palaeoclimatology, Palaeoecology, 119(3-4), pp.221-254. DOI: https://doi.org/10.1016/0031-0182(95)00009-7

Keller, G., Mateo, P., Monkenbusch, J., Thibault, N., Punekar, J., Spangenberg, J.E., Abramovich, S., Ashckenazi-Polivoda, S., Schoene, B., and Eddy, M.P., 2020. Mercury linked to Deccan Traps volcanism, climate change and the end-Cretaceous mass extinction. Global and Planetary Change, 194, p.103312. DOI: https://doi.org/10.1016/j.gloplacha.2020.103312

Kharajiany, S.O.A., Al-Qayim, B.A., and Wise, S.W. Jr., 2019. Calcareous nannofossil stratigraphy of the Upper Cretaceous-lower Paleocene sequence from the Chinarok section, Sulaimaniah area, Kurdistan region, NE Iraq. Iraqi Bulletin of Geology and Mining, 15(1), pp.1-14. DOI: https://doi.org/10.58998/jnr2145

Kharajiany, S.O.A., Wise, S.W., and Al-Qayim, B.A., 2020. The Danian sediments and the K/Pg boundary determination using calcareous nannofossil from Sulaimani area, Kurdistan Region/Iraq. Carbonates and Evaporites, 35(3), pp.1-14. DOI: https://doi.org/10.1007/s13146-020-00609-1

Kline, V.H., 1943. Clay County fossils, Midway Foraminifera and Ostracoda. Mississippi State Geological Survey, University of Mississippi Bulletin, 53, pp.1-98.

Koeberl, C., 1989. Iridium enrichment in volcanic dust from blue ice fields, Antarctica, and possible relevance to the K/T boundary event. Earth and Planetary Science Letters, 92(3-4), pp.317-322. DOI: https://doi.org/10.1016/0012-821X(89)90056-3

Lawa, F.A., and Qadir, H.A., 2023. New biostratigraphic ideas about the cretaceous/paleogene boundary from selected sections in Kurdistan-Mesopotamian foreland basin, Northern Iraq. Iraqi National Journal of Earth Science, 23(2), pp.124-156. DOI: https://doi.org/10.33899/earth.2023.139689.1069

Leonov, G.P., and Alimarina, V.P., 1961. Stratigraphy and Foraminifera of Cretaceous-Paleogene “Transition” Beds of the Central Part of the North Caucasus. Moscow University Geology Faculty, Moscow, pp.29-60.

Li, L., and Keller, G., 1998a. Diversification and extinction in Campanian-Maastrichtian planktic foraminifera of Northwestern Tunisia. Eclogae Geologicae Helvetiae, 91(1), 75-102.

Li, L., and Keller, G., 1998b. Maastrichtian climate, productivity and faunal turnovers in planktic foraminifera in South Atlantic DSDP sites 525A and 21. Marine Micropaleontology, 33(1-2), pp.55-86. DOI: https://doi.org/10.1016/S0377-8398(97)00027-3

Loeblich Jr. A.R., 1951. Coiling in the Heterohelicidae. Contributions from the Cushman Foundation for Foraminiferal Research, 2(3), pp.106-110.

Loeblich, A.R., and Tappan, H., 1955. Revision of some glanduline Nodosauridae (Foraminifera). Smithsonian Miscellaneous Collections, 126(3), pp.1-18.

Loeblich, A.R., and Tappan, H., 1957. Planktonic Foraminifera of Paleocene and early Eocene Age from the Gulf and Atlantic coastal plains. In: Loeblich, A.R. Jr., Tappan, H., Beckmann, J.P., Bolli, H.M., Montanaro Gallitelli, E., and Troelsen, J.C. (eds) Studies in Foraminifera. U.S. National Museum Bulletin No 215, pp.173-198.

Luterbacher, H., and Premoli-Silva, I., 1964. Biostratigrafia del limite Cretaceo-Terziario nell'Appennino Centrale. Rivista Italiana di Paleontologia, 70, pp.67-128.

Madhavaraju, J., and Lee, Y.I., 2010. Influence of deccan volcanism in the sedimentary rocks of late Maastrichtian-Danian age of cauvery basin Southeastern India: constraints from geochemistry. Current Science, 98, pp.528-537.

Maestas, Y., MacLeod, K.G., Douglas, R., Self-Trail, J., and Ward, P.D., 2003. Late cretaceous foraminifera, paleoenvironments, and paleoceanography of the Rosario Formation, San Antonio del Mar, Baja California, Mexico. The Journal of Foraminiferal Research, 33(3), pp.179-191. DOI: https://doi.org/10.2113/33.3.179

Martínez R.J., 1989. Foraminiferal biostratigraphy and paleoenvironments of the Maastrichtian Colon mudstones of northern South America. Micropaleontology, 35, pp.97-113. DOI: https://doi.org/10.2307/1485462

Maruoka, T., 2019. Mass Extinction at the Cretaceous-Paleogene (K-Pg) Boundary, Astrobiology: From the Origins of Life to the Search for Extraterrestrial Intelligence. Springer, Germany, pp.303-320. DOI: https://doi.org/10.1007/978-981-13-3639-3_19

Masters, B.A., 1984. Comparison of Planktonic Foraminifers at the Cretaceous-Tertiary Boundary from the El Haria Shale (Tunisia) and the Esna Shale (Egypt). In: Proceedings of the 7th Exploration Seminar, pp.310-324.

Mateo, P., Keller, G., Adatte, T., Bitchong, A.M., Spangenberg, J.E., Vennemann, T., and Hollis, C.J., 2020. Deposition and age of Chicxulub impact spherules on Gorgonilla Island, Colombia. GSA Bulletin, 132(1-2), pp.215-232. DOI: https://doi.org/10.1130/B35287.1

Molina, E., Alegret, L., Arenillas, I., and Arz, J.A., 2005. The Cretaceous/Paleogene boundary at the Agost section revisited: Paleoenvironmental reconstruction and mass extinction pattern. Journal of Iberian Geology, 31(1), pp.135-148.

Morozova, V.G., 1959. Stratigraphy of the Danian-Montian deposits of the Crimea according to the Foraminifera. Doklady Akademii Nauk, 124(5), pp.1113-1115.

Mousa, A.K., Al-Dulaimi, S.I., and Mohammed, I.Q., 2020. Biostratigraphy of the late cretaceous/early Paleocene successions at KH 56 and KH 58 core interval, Western Desert of Iraq. The Iraqi Geological Journal, 53(1), pp.104-125. DOI: https://doi.org/10.46717/igj.53.1E.8Ry-2020.07.08

Mustafa, A.I., Mansurbeg, H., and Mohialdeen, I.M.J., 2022. Petrography and Clay Mineral Variations Across the Cretaceous/Paleogene (K/Pg) Boundary, Sulaimani, Kurdistan Region, Iraq. Iraqi Geological Journal, 55(2), pp.16-34. DOI: https://doi.org/10.46717/igj.55.2E.2ms-2022-11-16

Nederbragt, A.J., 1991. Late Cretaceous biostratigraphy and development of Heterohelicidae (planktic foraminifera). Micropaleontology, 37, pp.329-372. DOI: https://doi.org/10.2307/1485910

Obaidalla, N.A., 2005. Complete Cretaceous/Paleogene (K/P) boundary section at Wadi Nukhul, southwestern Sinai, Egypt: Inference from planktic foraminiferal biostratigraphy. Revue de Paléobiologie, 24(1), p.201.

Olsson, R.K., 1960. Foraminifera of latest Cretaceous and earliest Tertiary age in the New Jersey Coastal Plain. Journal of Paleontology, 34, pp.1-58.

Olsson, R.K., 1964. Late Cretaceous planktonic foraminifera from New Jersey and Delaware. Micropaleontology, 10(2), pp.157-188.Olsson, R.K., Berggren, W.A., Hemleben, C., and Huber, B.T., 1999. Atlas of Paleocene planktonic foraminifera. Smithsonian Contributions to Paleobiology, 85. pp.1-252. DOI: https://doi.org/10.2307/1484638

Pessagno, E.A., 1967. Upper Cretaceous planktonic foraminifera from the western Gulf Coastal Plain. Palaeontographica Americana, 5, pp.245-445Plummer, H.J., 1927. Foraminifera of the Midway Formation in Texas, Bulletin No, 2644. University of Texas, Austin, pp.1-206.

Renne, P.R., Deino, A.L., Hilgen, F.J., Kuiper, K.F., Mark, D.F., Mitchell, W.S., Morgan, L.E., Mundil, R., and Smit, J., 2013. Time scales of critical events around the cretaceous-paleogene boundary. Science, 339(6120), pp.684-687. DOI: https://doi.org/10.1126/science.1230492

Robaszynski, F., Caron, M., Gonzales Donoso, J.M., Wonders, A.A.H., and The European Working Group on Planktonic Foraminifera., 1984. Atlas of late cretaceous globotruncanids. Revue de Micropaléontologie, 26(3-4), pp.145-305.

Robaszynski, F., Caron, M., Gonzalez, D. J. M. and Wonders, A. A.H., 1984. Atlas of Late Cretaceous Globotruncanids Revue de Microp., Vol. 26, No. 3 - 4, pp. 145- 305.

Rzehak, A., 1891. Die Foraminiferenfauna der alttertiären Ablagerungen von Bruderndorf in Niederösterreich, mit Berücksichtigung des angeblichen Kreidevorkommens von Leitzersdorf. Annalen des Naturhistorischen Museums in Wien, 6(Häft 1), pp.1-12.

Sahib, G.M., and Al-Dulaimi, S.I.M., 2022. Biostratigraphy of the late cretaceous-early paleocene succession in selected wells, Jambur Oil field, Kirkuk, Northern Iraq. The Iraqi Geological Journal, 55, pp.223-240. DOI: https://doi.org/10.46717/igj.55.2C.17ms-2022-08-30

Salih, M.S., Al-Mutwali, M.M., and Aldabbagh, S.M., 2015. Geochemical study of the Cretaceous-Tertiary boundary succession exposed at Duhok Dam area (eastern Tethys): Northern Iraq. Arabian Journal of Geosciences, 8(1), pp.589-603. DOI: https://doi.org/10.1007/s12517-013-1172-2

Samir, A.M., 2002. Biostratigraphy and paleoenvironmental changes in the upper Cretaceous-Early Paleogene deposits of Gabal Samara section, Southwestern Sinai. Egypt. Egypt Journal of Paleontology, 2, pp.1-40.

Sarigül, V., Hakyemez, A., Tüysüz, O., Can Genç, Ş., Yilmaz, İ.Ö., and Özcan, E., 2017. Maastrichtian-Thanetian planktonic foraminiferal biostratigraphy and remarks on the K-Pg boundary in the southern Kocaeli Peninsula (NW Turkey). Turkish Journal of Earth Sciences, 26(1), pp.1-29. DOI: https://doi.org/10.3906/yer-1602-23

Schulte, P., Alegret, L., Arenillas, I., Arz, J.A., Barton, P.J., Bown, P.R., Bralower, T.J., Christeson, G.L., Claeys, P., Cockell, C.S.,... & Willumsen, P.S., 2010. The Chicxulub asteroid impact and mass extinction at the Cretaceous-Paleogene boundary. Science, 327(5970), pp.1214-1218. DOI: https://doi.org/10.1126/science.1177265

Scotese, C.R., 2011. Paleogeographic and Paleoclimatic Atlas. In: AAPG Search and Discovery Article, 30192. AAPG 2011Annual Convention and Exposition.

Sharbazheri, K., Ghafor, I., and Muhammed, Q., 2009. Biostratigraphy of the cretaceous/tertiary boundary in the Sirwan Valley (Sulaimani Region, Kurdistan, NE Iraq). Geologica Carpathica, 60(5), p.381-396. DOI: https://doi.org/10.2478/v10096-009-0028-x

Sharbazheri, K.M., Ghafor, I.M., and Muhammed, Q.A., 2011. Biostratigraphy of the Cretaceous/Paleogene boundary in Dokan area, Sulaimaniyah, Kurdistan Region, NE Iraq. Iraqi Bulletin of Geology and Mining, 7(3), pp.1-24.

Sigal, J., 1952. Apercu Stratigraphique sur la Micropaleontologie du Cretace. XIXème Congrès Géologique International, Alger. Monographies Regionales. Vol. 1. pp.3-43.

Silva, I.P., and Sliter, W.V., 1999. Cretaceous paleoceanography: evidence from planktonic foraminiferal evolution. In: Evolution of the Cretaceous Ocean-Climate System. Vol. 332. Geological Society of America, United States, p.301.

Sissakian, V.K., and Al-Jiburi, B.S.M., 2014. Stratigraphy of the high folded zone. Iraqi Bulletin of Geology and Mining, 6, pp.73-161.

Smit, J., and Hertogen, J., 1980. An extraterrestrial event at the Cretaceous-Tertiary boundary. Nature, 285, pp.198-200.Smit, J., and Ten Kate, W., 1982. Trace-element patterns at the Cretaceous-Tertiary boundary-consequences of a large impact. Cretaceous Research, 3(3), pp.307-332. DOI: https://doi.org/10.1016/0195-6671(82)90031-3

Stinnesbeck, W., Keller, G., Schulte, P., Stüben, D., Berner, Z., Kramar, U., and Lopez-Oliva, J.G., 2002. The Cretaceous-Tertiary (K/T) boundary transition at Coxquihui, state of Veracruz, Mexico: Evidence for an early Danian impact event? Journal of South American Earth Sciences, 15(5), pp.497-509. DOI: https://doi.org/10.1016/S0895-9811(02)00079-2

Tilev, N., 1951. Etude des Rosalines maestrichtiennes (genre Globotruncana) du Sud-Est de la Turquie (Sondage de Ramandaǧ). Maden Tetkik ve Arama Enstitüsü Yayınlarından - Publications de l’Institut d’Etudes et de Recherches Minières de Turquie Séreis No B 16, pp.1-101.

Toumarkine, M., and Luterbacher, H., 1985. Paleocene and eocene planktic foraminifera. In: Bolli, H.M., Saunders, J.B., and Perch-Nielsen, K., eds. Plankton Stratigraphy. Cambridge University Press, Cambridge, pp.87-154.

Voorwijk, G.H., 1937. Foraminifera from the upper cretaceous of Habana, Cuba. Koninklijke Nederlandse Akademie van Wetenschappen, 40(2), pp.190-198.

Wade, B.S., Pearson, P.N., Berggren, W.A., and Pälike, H., 2011. Review and revision of Cenozoic tropical planktonic foraminiferal biostratigraphy and calibration to the geomagnetic polarity and astronomical time scale. Earth-Science Reviews, 104(1-3), pp.111-142. DOI: https://doi.org/10.1016/j.earscirev.2010.09.003

White, M.P., 1928. Some index Foraminifera of the Tampico embayment of Mexico, part I and part II. Journal of Paleontology, 2, pp.177-215.

How to Cite
Ghafor, I. M., Mustafa, A. I., Mohialdeen, I. M. and Mansurbeg, H. (2024) “High-resolution biostratigraphic zonation across the Cretaceous/Paleogene (K/Pg) boundary from the Sulaymaniyah area, Kurdistan Region, Northeastern Iraq”, ARO-THE SCIENTIFIC JOURNAL OF KOYA UNIVERSITY, 12(1), pp. 207-223. doi: 10.14500/aro.11587.