Last Updated:

21/08/2020 - 14:36

The research article “A Cenomanian–Santonian rudist–bearing carbonate platform on the northern Arabian Plate, Turkey: facies and sequence stratigraphy”, co-authored by METU member Prof. İsmail Ömer Yılmaz, has been published in Cretaceous Research.

Recent studies have shown that Cenomanian–Santonian carbonate sedimentary rocks rich in rudists are widespread throughout southeastern Turkey. The Derdere and Karababa formations have been analysed in the Sabunsuyu section (Kilis Province). On a field scale, we can distinguish rudist–rich beds that rhythmically alternate with bioclastic levels composed of bivalves, gastropods and roveacrinids in these formations. Although pelagic faunal elements (predominantly planktic foraminifera and pithonellids) are documented in the lowermost part of the series, the rudist–rich facies are represented mainly in the Derdere and Karababa formations. Rudists, benthic and planktic foraminifera indicate middle–late Cenomanian and Turonian–Santonian ages for the Derdere and Karababa formations, respectively. Based on studied facies, five microfacies have been recognised and categorised in three facies groups: inner ramp, mid ramp and outer ramp. Evidence such as gradual changes in facies and absence of extensive uninterrupted barrier reefs indicate that the Derdere Formation was deposited in a ramp depositional system. The sedimentology and taphonomic signature of the rudist shell beds have been described in order to obtain a better understanding of the depositional environment and the physical processes that controlled Cenomanian–Santonian sedimentation. Monospecific tabular beds characterise mainly the upper part of the series (topmost part of Derdere Formation and Karababa Formation); more complex rudist concentrations, characterised by moderate species diversity, increase upsection. The rudist levels are associated with highstand systems tract deposits because of the suitability of trophic conditions in the rudist–dominated ramp.

Mülayim, O., Yılmaz, İ. Ö., Özer, S., Sarı, B., & Taslı, K. (2020). A Cenomanian–Santonian rudist–bearing carbonate platform on the northern arabian plate, turkey: Facies and sequence stratigraphy. Cretaceous Research, 110 doi:10.1016/j.cretres.2020.104414


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METU Author

Prof. İsmail Ömer Yılmaz Scopus Author ID: 7004914041
About the author


Bivalves, Carbonate ramp, Cenomanian–Santonian, Mediterranean

Other authors:
Mülayim, O., Özer, S., Sarı, B., & Taslı, K.

This work was partially supported by the Scientific and Technological Research Council of Turkey (TUBITAK, Project no. 118Y425, Ankara, Turkey). We would like to thank TPAO for logistic support and are grateful to Robert Scott and two anonymous reviewers, as well as Eduardo Koutsoukos (Editor–in–Chef) and John Jagt (Handling Editor), for corrections and comments on previous versions of the text.