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Systematic, microbiostratigraphy and paleoecology of the Bajwan Formation (Late Oligocene) in the Kirkuk Well-160, northeastern Iraq

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Abstract

Microbiostratigraphy and paleoecology of the Bajwan Formation (Chattian) from the Kirkuk Oil Field (K. 160), Kirkuk area, Northeastern Iraq, are investigated. Thirty-one species from 17 genera of large benthic foraminifera in addition to non-foraminifera fossils such as Gastropods, Bivalves, and Echinoid fragments, Bryozoan, Coral, and Algae are recognized from the studied well. Based on the recognized large benthic foraminifera, it is subdivided into two biozones: Praerhapydionina delicate–Peneroplis evolutus Assemblage zone and Praerhapydionina delicate–Archaias kirkukensis Assemblage zone. Both suggest Late Oligocene (Chattian) age. The recognized biozones were correlated with comparatively well-known biozones from other parts of the Tethys region which showed a good comparison between the biostratigraphic zones established in this study with other studies. The biotic associations identified in this study suggest that this association thrived in tropical-to-subtropical environments, generally found in a restricted to shallower water depth, with normal water salinity environment ranges from 34 to 50‰, under mesotrophic-to-oligotrophic conditions.

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  1. Department of Geology, College of Science, University of Sulaimani, Sulaimanyah-Kirkuk Main Road, 46002, Sulaimani, Kurdistan Region, Iraq

    Imad Mahmood Ghafor

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Ghafor, I.M. Systematic, microbiostratigraphy and paleoecology of the Bajwan Formation (Late Oligocene) in the Kirkuk Well-160, northeastern Iraq. Carbonates Evaporites 37, 45 (2022). https://doi.org/10.1007/s13146-022-00793-2

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