Biostratigraphy of the Early Turonian- Late Campanian pelagic limestone (Kometan and Gulneri formations) near Sayid Sadyq Town, Kurdistan Region, NE-Iraq.


  • Araz Omer Salih Al-Khafaf Department of Geology, College of Science, University of Sulaimani, Kurdistan Region, Iraq. Author



Planktonic foraminifera, Early Turonian, Late Campanian, Cretaceous Biozonation, Sulaymaniyah Governorate, Kurdistan Region, Northeast Iraq


This study aims at the presentation of a planktonic foraminiferal biozonation of the Late Cretaceous pelagic carbonate section in the east of Sulaymaniyah governorate Kurdistan region, Northeast of Iraq. The zonation proved the occurrence of the Kometan and Gulneri formations which belong to the Early Turonian – Late Campanian age. This is achieved by taking fifty-two (52) samples from the lower part of the section to the upper one with an interval of two meters between successive samples. From these samples, sixty-two (62) thin sections are prepared and (43) species from (11) genera of planktonic foraminifera are indicated and identified in the two formations of the studied section. According to the First and Last occurrence of identified planktonic foraminiferal assemblage, the studied section is divided into seven biozones, from older to young. These biozones are Whitenella archaeocretacea-Heterohelix moremani Total Range Zone, Marginotruncana sigali Partial Range Zone, Dicarinella concavata Interval Range Zone, Dicarinella asymetrica Total Range Zone, Globotruncanita elevata Partial Range Zone, Globotruncana ventricosa Interval Range Zone, Radotruncana calcarata Total Range Zone. The age of the two Formations is assigned as Early Turonian- Late Campanian based on the planktonic foraminiferal ranges from the lower part of the section to the upper part. The boundary of the Gulneri and Balambo formations is gradation while there is a gap between the former formation and Kometan Formation.


Bellen, R.V., Dunnington, H.V., Wetzel, R. and Morton, D. (1959). Lexique stratigraphic

international”, Asie, Fasc. 10a, Iraq, Paris, 333pp.

Buday, T. (1980). The regional geology of Iraq, Volume 1, stratigraphy and Paleogeography, Kassab,l.

M. and Jassim , S.Z. (eds), GEOSURVE, Baghdad,Iraq 445p.

Abawi, T.S. and Hammoudi, R.A. (1997). Foraminiferal biostratigraphy of the Kometan and Gulneri

formations (upper Cretaceous) in Kirkuk area, north of Iraq, Iraqi Geological Journal, 30(2), pp.139-146.

Abawi T.S., Mahmood, Saad A. (2005). Biostratigraphy of the Kometan and Gulneri Formations (Upper

Cretaceous) in Jrmbor well No. 46, Northern Iraq, Iraqi National Journal of Earth Science, 5(1), pp.1-8.

Abawi, T.S., Hammoudi, R.A. and Al-Khafaf, A.O. (2006). Stratigraphy of the Gulneri Formation

(Upper Cretaceous) in the type section, Dokan Area, Northeastern Iraq”, Iraqi Journal of Science, 6(2),


Lawa, F. and Al-Khafaf, A. (2022). Biostratigraphy of Dokan and Gulneri formations from Kosrat

Anticline, Sulaimani Area, Kurdistan Region-Iraq, Iraqi Bulletin of Geology and Mining, 18(2), pp.25-42.

Karim, K. H and Taha Z.A. (2009a). New ideas about Gulneri Shale Formation (early Turonian) in

Dokan area, Kurdistan Region, NE- Iraq, Iraqi Bulletin of Geology and Mining. 5 (2): 29-39.

Dunnington H.V. (1953). Kometan formation (Oligostegina/ Marlanit) of the M.P.C. central and

southern area subsurface section, INOC (Unpub. Rep.) N IR.(HVD/532).

Youkhanna, A.K. (1976). Foraminifera and biostratigraphy of some Late Cretaceous marine sediments

of North-East Iraq, Doctoral dissertation, University College of Swansea.

Al-Dhaif S.A. (1997). Biostratigraphy of Dokan, Gulneri and Kometan formation of jambour well-46

north Iraq”, Unpublished M.Sc. thesis university of Mosul, pp. 80.

Al-Khafaf, A.O. (2005). Stratigraphy of Kometan Formation (Upper Cretaceous) in Dokan-Endezah

Area, NE-Iraq, Unpublished MSc thesis, University of Mosul, Department of Geology.

Karim, K.H. and Taha, Z.A. (2009b). Tectonical history of Arabian platform during Late Cretaceous

An example from Kurdistan region, NE Iraq. Iranian Journal of Earth Sciences, 1(1): 1-14

Jassim, S.Z. and Goff, J.C. (2006). Geology of Iraq, Dolin. Prague and Moravian Museum, Brno, Czech

Republic, 408.

Al-Fadhli, I., Janardan Rao, Y., Oweiss, G., Takla, M. A. (1980). Superimposed Folding in SayedSadek area, near the Zagros suture zone, Iraq, Geoviews, VIII, (111), 126-148.

Ghafor, I.M., Karim, K.H. and Baziany, M.M. (2012). Age determination and origin of crenulated

limestone in the eastern part of Sulaimaniyah Area, Kurdistan Region, NE Iraq, Iraqi Bulletin of geology

and Mining, 8(2), pp.21-30.

Postuma, J.A. (1971). Manual of planktonic foraminifera Elsevier publishing Co., Amsterdam, p. 420.

Caron, M., Bolli, H.M., Saunders, J.B. and Perch-Nielsen, K. (1985). Cretaceous planktic

foraminifera”, Plankton stratigraphy, 1, pp.17-86.

Sliter, W. V. (1989). Biostratigraphic zonation for Cretaceous planktonic foraminifers examined in thin DOI:

section Journal of Foraminiferal Research vol.19, No.1, p. 1-19.

Georgescu, M.D. (2002). Available at: index.htm An

Interactive Guide to Planktonic Foraminifera A. Cretaceous taxa.

Pessagno, E.M. (1967). Upper Cretaceous planktonic foraminifera from the Western Gulf Coastal

Plain”, Paleontogr. Amer., 5 (37), pp.245-445.

Cushman, J.A. (1946). Upper Cretaceous foraminifera of the Gulf Coastal region of the United States DOI:

and adjacent areas”, (Vol. 206) US Government Printing Office.

Morrow, A.L. (1943). Foraminifera and ostracoda from the Upper Cretaceous of Kansas”, Journal of

Paleontology, pp.186-205.

Reichel, M. (1950). Observations sur les Globotruncana de gisement de la Breggia (Testin. Eclogae

Geologicae Helvetiae 42, 596-617.

Ehrenberg, C.G., (1840). Uber ausgezeichnete jetzt lebende peruanische und mexikanische MeeresInfusorien, welche mit zur Erlauterrung rathselhafter fossiler Formen der Kreidebildung dienen”, Bericht

uber die zur Bekanntmachung geeinigneten Verhandlungen der Koniglich-Preussischen Akademie der

Wissenschaften zu Berlin, pp.157-162.

Bolli, H.M. (1966). Zonation of Cretaceous to Pliocene marine sediments based on planktonic

foraminifera. Zürich, Switzerland, Geologisches Institut der Eidg. Technischen Hochschule und der

Universität Zürich.

Douglas, R.G. and Rankin, C. (1969). Cretaceous planktonic foraminifera from Bornholm and their DOI:

zoogeographic significance, Lethaia, 2(3), pp.185-217.

Sigal, J. (1952). Apercu stratigrapique sur la micropaleontologie du Cretace”, In Congres Geologique

International, XIXe, Monographies regionales, Algiers, serie 1: Algerie (Vol. 26, pp. 3-43.

Tappan, H. (1940). Foraminifera from the Grayson Formation of northern Texas. Journal of

Paleontology, pp.93-126.

Abdel-Kireem, M.R., Schrank, E., Samir, A.M. and Ibrahim, M.I.A. (1996). Cretaceous palaeoecology,

palaeogeography and palaeoclimatology of the northern Western Desert, Egypt”, Journal of African Earth

Sciences, 22(1), pp.93-112.

Hussain, S.A. and AL-Sheikhly, S.S. (2015). Paleoecology of Albian–Santonian succession of Surdash

to Shaqlawa area, NE Iraq”, Iraqi Journal of Science, 56(2A), pp.1076-1097.

Al-Khafaf, A.O. (2014). Biostratigraphic contribution to the differentiation of the Lower-Middle

Cretaceous units in the imbricated zone of Sulaimani Governorate, Kurdistan Region, NE

Iraq”, Unpublished Ph. D. Thesis, University of Sulaimani.

Ghafor, I., Sharbasheri, K. and Ahmad, S. (2004). Biostratigraphy of the Balambo Formation (late

Aptian-Turonian) in Khamza Valley, Qalachwalan area, northeastern Iraqi-Kurdistan Region”, Zanco, 16,


Ghafor, I.M. (1993). Planktonic Foraminifera ranges in the Balambo Formation (Albian-Turonian) in

Sulaimanya, Azmar region, Northeastern Iraq”, In Second Scientific Congress, pp. 24-25.

Brotzen, F. (1934). Foraminiferen aus dem Senon Palästinas”, Zeitschrift des Deutschen PalästinaVereins (1878-1945), (H. 1), pp.28-72.

Reuss A.E. (1845). Die versteinerungen der bohrnischen kreideformation , verlagsbuchhandlung E

Schweize rbart sche, Stuttgart, Vol.7, pp. 58.

Gandolfi, R. (1955). The genus Globotruncana in northeastern Colombia”, Paleontological Research


Mornod, L. (1950). Les Globorotalides du Cretace superieur du Montsalvens (Prealpes

fribourgeoises)”, Eclogae Geologicae Helvetiae, 42, pp.573-596.

Subbotina, N.N. (1953). Fossil foraminifera of the USSR: Globigerinidae. Hantkeninidae and

Globorotaliidae (in Russian)”, Trudy Vsesoyuznogo Nauchno-Issledovatel’skogo Geologorazvedochnogo

Instituta (VNIGRI), 76, p.294.

Vogler, J. (1941). Ober-Jura und Kreide von Misol (Niederländisch-Ostindien)”, PalaeontographicaSupplementbände, pp.243-293.

Wonders, A.A.H. (1980). Middle and late Cretaceous planktonic Foraminifera of the western

Mediterranean area”, Doctoral dissertation, Utrecht University.

Al-Jassim, J.A., Al-Sheikhly, S.S.J. and Al-Tememmy, F.M., (1989). Biostratigraphy of the Kometan

Formation (late Turonian-early Campanian) in northern Iraq”, Journal of the Geological Society of

Iraq, 22(1), pp.53-60.

Dalbiez, F. (1948). The genus Globotruncana in Tunisia”, Micropaleontology, pp.161-171,( 1955) DOI:

Lalicker, C. G. A. (1975). New genus of Foraminifera from the Upper Cretaceous”, Journal of

Paleontology. 22: 624.

d'Orbigny, A.D., (1840). Mémoire sur les foraminifères” de la craie blanche du bassin de Paris.

Darmoian, S.A. (1975). Planktonic foraminifera from the Upper Cretaceous of southeastern Iraq: DOI:

biostratigraphy and systematics of the Heterohelicidae”, Micropaleontology, pp.185-214.

White, M.P. (1928). Some index foraminifera of the Tampico Embayment area of Mexico”, Part

II. Journal of Paleontology, 2(4), pp.280-317.

Plummer, H.J. (1931). Some Cretaceous foraminifera in Texas: University of Texas”, Bulletin, v. 3101.

Carsey, D.O. (1926). Foraminifera of Cretaceous of central Texas”, Texas University Bulletin, 2612,


Van Hinte, J.E. (1976). A Cretaceous time scale”, AAPG Bulletin, 60(4), pp.498-516. DOI:



How to Cite

Biostratigraphy of the Early Turonian- Late Campanian pelagic limestone (Kometan and Gulneri formations) near Sayid Sadyq Town, Kurdistan Region, NE-Iraq. (2023). Journal of Zankoy Sulaimani - Part A, 25(2), 14.

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