Abstract

The Upper Cretaceous sequence of the Korkuteli area (Western Taurides) comprises two formations. The Bey Dağları Formation lies at the base and can be divided into two parts. A 600-m-thick neritic lower part is capped with thin, massive, hemipelagic limestones. The Akdağ Formation disconformably overlies different stratigraphic levels of the Bey Dağları Formation along a prominent erosional surface and consists of thin-bedded, cherty, pelagic, clayey limestones. Paleogene marls form the base of the Tertiary sequence and disconformably overlie different stratigraphic levels of the Upper Cretaceous succession. This study identifies from thin sections and analyzes the Late Cretaceous planktonic foraminifera.

Identification of forty-five species belonging to the genera Contusotruncana, Dicarinella, Gansserina, Globotruncana, Globotruncanella, Globotruncanita, Marginotruncana and Radotruncana has led to the recognition of five biostratigraphic zones, in ascending order: Dicarinella concavata Interval Zone (IZ), Dicarinella asymetrica Total Range Zone (TRZ), Radotruncana calcarata TRZ, Globotruncana falsostuarti Partial Range Zone (PRZ) and Gansserina gansseri IZ, from the Senonian succession of the Bey Dağları autochthon. The Dicarinella concavata IZ and Dicarinella asymetrica TRZ have been identified from the massive hemipelagic limestones of the Bey Dağları Formation and indicate a Coniacian-Santonian age. The Radotruncana calcarata TRZ, Globotruncana falsostuarti PRZ and Gansserina gansseri IZ have been recognized from the pelagic limestones of the Akdağ Formation and suggest a late Campanian-early Maastrichtian age.

The identified planktonic foraminiferal biozones indicate that the Bey Dağları carbonate platform drowned after the late Turonian; the Upper Cretaceous (Coniacian-early Maastrichtian) pelagic succession includes two stratigraphic gaps in the Korkuteli area corresponding to lower-middle Campanian and upper Maastrichtian. Slight drowning of the platform after the late Turonian may have been related to the regional extension which affected peri-Mediterranean alpine belts. The regional hiatuses in the pelagic succession are also ascribed to the tectonic events, as the Late Cretaceous is a time of great tectonic activity in this critical area of Tethys. Eustatic sea-level changes may have had a secondary effect on the Upper Cretaceous carbonate succession of the Bey Dağları autochthon.

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