• Falah H. Khalaf Al-jubori (B.Sc., Ph.D.) Knowledge university, College of Engineering, Department of petroleum Engineering. Erbil, Kurdistan Region, Iraq
  • Akram K. Youkhana (B.Sc., Ph.D.) Ex- expert Geologist, Ministry of Oil, Oil Exploration Company, Iraq
  • Srood F. Naqshabandi (B.Sc., Ph.D.) Department of Geology, College of Science, Salahaddin University, Erbil, Iraq
  • Dyana A. Bayz (B.Sc., M.Sc.) Knowledge university, College of Engineering, Department of petroleum Engineering. Erbil, Kurdistan Region, Iraq



Acritarchs, Algae, Biostratigraphy, Foraminifera, Miospores, Palynology

Abstract [English]

The Paleozoic rocks outcropped in northern Iraq (Ora, Chia Zairi section) are biostratigraphically investigated for their microfossils content. Benthonic foraminifera and algal genera characterize the upper part of the section while palynomorphs (Miospores & Acritarchs) dominated the lower part the section which is consist of clastic sediments. The study also include the stratigraphic succession of the section and its correlation to the subsurface sections penetrated in oil and  water wells drilled in the western desert of Iraq in order to determine the regional distribution of the economically important formations, either  as reservoir or as source  rocks for hydrocarbons. Index palynomorphs including many types of Acritarch genera are identified in the Khabour Formation indicate lower Ordovician time (Tremadocian? Arenigian –Llanvirnian: age) The Perispik Formation has been found barren of any type of microfossils and is composed of red clastic rocks.

Pollen and Spores are recorded from the "Ore Group"  (Kaista, Ora and Harur Formations )  indicate that these rocks are of Upper Devonian – Lower Carboniferous  (Famennian – Tournaisian age ) .A Large number of  foraminifera and Algal genera are identified in the Chiazairi rocks,these genera and species are indicated the Upper Permian rocks of Thuringian age.

The stratigraphic   succession of the Paleozoic section studied in northern Iraq indicate that there is a stratigraphic break represents by missing of the Ga'ara Formation (late Carboniferous –early Permian) and Akkas Formation (Silurian) and the upper part of the Khabour Formation (Upper Ordovician).


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AL.Amiri, T. K., AL-Jubori F.H.,AL-Naqshbandy S.F.1991 Lower Silurian palynomorphs from Western Iraqi desert and the Palaeoclimate. Jour. science and nature, university of salahadian Vol.1, No.A, Erbil, Iraq.

AL- Berkadar A.M and Khalaf Al-jubori F.H., 1985: Palynological study of the penetrated section of the water well KH5/1, western desert of Iraq. (Internal Report, OEC, Ministry of Oil, Iraq).

Bellen, R.C.van, Dunnington, H.V., Wetzel R. and Morton D., 1959, Lexique Stratigraphique International Asie, fase, Iraq.

Buday,T. 1980,The regional geology of Iraq Vol.1 stratigraphy and paleogeography D.G, geology surv. Min. investigation, Lib, pub., 1 445pp. 22 text. figures 19 tables .

Falah H.Khalaf and Hanan F. Shatraya 1986: Stratigraphy study of the section from depth 1975 -4285 meters of the exploration Oil Well Diwan -1,(in Arabic,internal report ).

Falah H.Khalaf, 1997 Palynological study of the Silurian and Ordovician sediments of the exploration oil Well Khleissia -1. (Internal report)

Falah H.Khalaf 1997 Silurian Organic -Walled Microfossils from Well Risha -1-, Jordan Iraq Geological Journal, and vol 28, No-2 pp.170.184.

Falah H.Khalaf, Akram K.Yonkhanna, Mohammed A.AL-Rubaii and Adnan I. Samurai, 1998. The Akkas Formation, a new name for Paleozoic (Silurian) Lithostratigraphy unit in Iraq. Iraqi Gel .Jour.vol. 30, No.1, (Special issue).

Gaddo, J. and parker D.M.T., 1959: Final well report of Well Khleissia -1, M. P.C. Report, N.O.C. Library, Baghdad.

Final Geological report of well Risha No.3, Jordan, composite logs.

Wetzel R., 1950 Stratigraphy of the Amadiya region, M.P.C. Report. I.N.O.C Library No. TR/RW 12 Baghdad.




How to Cite

Al-jubori, F. H. K., Youkhana, A. K., Naqshabandi, S. F., & Bayz, D. A. (2020). BIOSTRATIGRAPHIC CORRELATION OF PALEOZOIC ROCKS IN NORTHERN AND WESTREN IRAQ. International Journal of Research -GRANTHAALAYAH, 8(3), 315–323.