Fossil Record 17(1): 41-57, doi: 10.5194/fr-17-41-2014
High-resolution stratigraphy of the Changhsingian (Late Permian) successions of NW Iran and the Transcaucasus based on lithological features, conodonts and ammonoids
expand article infoA. Ghaderi, L. Leda§, M. Schobben§, D. Korn|, A. R. Ashouri
‡ Department of Geology, Faculty of Sciences, Ferdowsi University, Mashhad, Iran§ Museum für Naturkunde, Leibniz-Institut für Evolutions- und Biodiversitätsforschung, Invalidenstraße 43, 10115 Berlin, Germany| Institut des Sciences de l'Evolution, Université Montpellier II, 34095 Montpellier, France
Open Access
The Permian–Triassic boundary sections in north-western Iran belong to themost complete successions, in which the largest mass extinction event inthe history of the Earth can be studied. We investigated the Changhsingian stage in sixsections in the area of Julfa (Aras Valley) for their lithology, conodontsand ammonoids. Revision of the biostratigraphy led to the separation of 10conodont 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 MerrilinaultimaStepanovites ?mostleri zones) and 8 ammonoid zones (from bottom to topIranites transcaucasiusPhisonites triangulus,Dzhulfites nodosus, Shevyrevites shevyrevi,Paratirolites trapezoidalis, P. waageni, Stoyanowites dieneri,Abichites stoyanowi and Arasella minuta zones). The new ammonoid generaStoyanowites and Arasella are described.