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Peryt, D. and Lamolda, M.A. (2002) Benthic Foraminifers from the Coniacian-Santonian Boundary Interval at Olazagutia, Spain. In: Lamolda, M.A., Comp., Meeting on the Coniacian-Santonian Boundary, Bilbao, 14-16 September 2002, Abstracts and Field Guide Book, 19.

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• TITLE: Biostratigraphy of the Abderaz Formation Based on Heterohelicids, at Six Stratigraphical Sections in East and Center of the Kopeh-Dagh Sedimentary Basin, Northeastern of Iran

  AUTHORS: Mohammad Vahidinia, Meysam Shafiee Ardestani

  KEYWORDS: Kopeh-Dagh Sedimentary Basin, Abderaz Formation, Biostratigraphy, Serial Planktonic Foraminifera

  JOURNAL NAME: International Journal of Geosciences, Vol.8 No.4, April 30, 2017

  ABSTRACT: In this study, Abderaz Formation at six stratigraphical sections, in east and center of the Kopeh-Dagh sedimentary basin, has been investigated, based on biserial planktonic foraminifera. Totally, 831 samples, with 3 meter distance, were gathered from a sequence with 2800 meter thickness. Also 4 genera and 17 species of biserial planktonic foraminifera have been identified and two biozones and two subzones recognized. Based on obtained data, the age of Early Turonian-Earliest Campanian for the Padeha, Abderaz village and Shorab sections, Midle Turonian-Earliest Campanian for type section, Early Turonian-Late Santonian for Qarehso section and Early Turonian-Earliest Santonian for Hajgelichkhan section were determined. The least amount of plank-tonic foraminifera was identified at Hajgelichkhan, while the maximum amount recognized at Qarehso section.