Ostracoda Assemblage and Environmental Interpretation of the Bartonian-Priabonian Seydiler Formation (Kastamonu-Northern Turkey) / Bartoniyen-Priaboniyen Yaşlı Seydiler Formasyonu’nun (Kastamonu-Kuzey Türkiye) Ostrakod Topluluğu ve Ortamsal Yorumu

Authors : Nazan YEŞİLYURT, Cemal TUNOĞLU, İbrahim K. ERTEKİN

Pages : 85-120

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Publication Date : 2009-04-01

Article Type : Research Paper

Abstract :The study area comprises about 40 km 2  and is located in the north of Seydiler town near Kastamonu  city. The unit, that is widely exposed in the region, is named for the first time “Seydiler Formation”.  This formation conformably overlies the Lutetian Gürleyikdere Formation at the base while it is overlain  by Recent and Quaternary alluvium deposits with an unconformity at the top. Seydiler Formation is  represented by thin bedded sandstone-marl alternations at the base and by medium to thick-bedded, dark  grey marls in the upper parts. The thickness of the formation varies from 30 to 215 meters.  Paleontological examinations were carried out on 184 samples collected from 7 stratigraphic sections.  Overall, 19 taxa belonging to 11 ostracod genera in 9 different families were determined. Among the   families Cytherellidae, Bairdiidae and Krithidae, were the dominant genera. One species  “Echinocythereis anatolica n.sp.” is proposed as a new species. Cytherella and Krithe are very abundant  and dominant within the ostracoda assemblage. Based on the ostracod assemblage examined, the age of  this unit is assigned as Bartonian-Priabonian. This assignment is also supported by the dating of  planktonic foraminifers, nannoplanktons and dinoflagellates. All paleontological data of the study area  indicate neritic to bathyal marine depositional conditions with normal salinities.
Keywords : Ostracoda, Bartonian Priabonian, Seydiler Formation, Kastamonu