Articles | Volume 17, issue 1
Foss. Rec., 17, 41–57, 2014
Foss. Rec., 17, 41–57, 2014

Research article 07 Mar 2014

Research article | 07 Mar 2014

High-resolution stratigraphy of the Changhsingian (Late Permian) successions of NW Iran and the Transcaucasus based on lithological features, conodonts and ammonoids

A. Ghaderi1, L. Leda2, M. Schobben2, D. Korn2, and A. R. Ashouri1 A. Ghaderi et al.
  • 1Department of Geology, Faculty of Sciences, Ferdowsi University, Mashhad, Iran
  • 2Museum für Naturkunde, Leibniz-Institut für Evolutions- und Biodiversitätsforschung, Invalidenstraße 43, 10115 Berlin, Germany

Abstract. The Permian–Triassic boundary sections in north-western Iran belong to the most complete successions, in which the largest mass extinction event in the history of the Earth can be studied. We investigated the Changhsingian stage in six sections in the area of Julfa (Aras Valley) for their lithology, conodonts and ammonoids. Revision of the biostratigraphy led to the separation of 10 conodont zones (from bottom to top Clarkina orientalisC. subcarinata interval zone, C. subcarinata, C. changxingensis, C. bachmanni, C. nodosa, C. yini, C. abadehensis, C. hauschkei, Hindeodus praeparvusH. changxingensis and Merrilina ultimaStepanovites ?mostleri zones) and 8 ammonoid zones (from bottom to top Iranites transcaucasiusPhisonites triangulus, Dzhulfites nodosus, Shevyrevites shevyrevi, Paratirolites trapezoidalis, P. waageni, Stoyanowites dieneri, Abichites stoyanowi and Arasella minuta zones). The new ammonoid genera Stoyanowites and Arasella are described.