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Lower Devonian ostracods from the Istanbul area, Western Pontides (NW Turkey): Gondwanan and peri-Gondwanan affinities

Published online by Cambridge University Press:  04 August 2014

EWA OLEMPSKA*
Affiliation:
Institute of Paleobiology, Polish Academy of Sciences, PL-00-818 Warszawa, Poland
ATİKE NAZİK
Affiliation:
Çukurova University, Department of Geological Engineering, TR-01330 Adana, Turkey
ŞENOL ÇAPKINOĞLU
Affiliation:
Karadeniz Technical University, Department of Geological Engineering, TR-61080 Trabzon, Turkey
DİLEK GÜLNUR SAYDAM-DEMİRAY
Affiliation:
General Directorate of Mineral Research & Exploration, Department of Geological Research, TR-06800 Çankaya/Ankara, Turkey
*
Author for correspondence: [email protected]

Abstract

A Lower Devonian silicified ostracod fauna has been recovered from limestone interbeds in the Büyükdere section of the Kozyatağı Member of the Pendik Formation. Forty-one species belonging to 33 genera have been recognized. Twenty-three are already known, and 15 are described in open nomenclature. One genus and three species (Omerliella rectangulata gen. et sp. nov., Microcheilinella istanbulensis sp. nov. and Roundyella goekchenae sp. nov.) are described. Silicified larval stages of trilobites, agglutinated foraminifers and conodonts co-occur with the ostracods. The ostracod assemblages are ‘mixed faunas’, between the epineritic Eifelian Mega-Assemblage, representative of high-energy environments, and the basinal Thuringian Mega-Assemblage, representative of low-energy environments. The conodont faunas of the Pendik Formation represent the serotinus, patulus and partitus biozones of the late Emsian – earliest Eifelian. The Emsian ostracods of NW Turkey show numerous species-level links between the Western Pontides (Istanbul Terrane) and assemblages of contemporaneous faunas of the Cantabrian Mountains (Spain), Morocco and Thuringia (Germany), and of similar biofacies. This supports the notion that the Istanbul Terrane, Armorican terrane-collage and northern margins of Gondwana were in geographical proximity in late Early Devonian time.

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Original Articles
Copyright
Copyright © Cambridge University Press 2014 

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