DOI: 10.15468/vr24z2
title: High-resolution stratigraphy of the Changhsingian (Late Permian) successions of NW Iran and the Transcaucasus based on lithological features, conodonts and ammonoids

description: This dataset contains the digitized treatments in Plazi based on the original journal article Ghaderi, A., Leda, L., Schobben, M., Korn, D., Ashouri, A. R. (2014): High-resolution stratigraphy of the Changhsingian (Late Permian) successions of NW Iran and the Transcaucasus based on lithological features, conodonts and ammonoids. Fossil Record 17 (1): 41-57, DOI: 10.5194/fr-17-41-2014, URL: http://dx.doi.org/10.5194/fr-17-41-2014Abstract. 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 orientalis – C. subcarinata interval zone, C. subcarinata, C. changxingensis, C. bachmanni, C. nodosa, C. yini, C. abadehensis, C. hauschkei, Hindeodus praeparvus – H. changxingensis and Merrilina ultima – Stepanovites? mostleri zones) and 8 ammonoid zones (from bottom to top Iranites transcaucasius – Phisonites 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.1 IntroductionPermian–Triassic boundary sections in the vicinity of Julfa (East Azerbaijan Province, NW Iran) play a key role in the subdivision of the Late Permian sedimentary successions of the Palaeotethyan realm (Figs. 1, 2). The Changhsingian (latest Permian) deposits were accumulated on an outer shelf (Leda et al., 2014); they display a continuous succession and contain a considerably rich pelagic fauna consisting of conodonts and cephalopods, allowing for the separation of a number of biozones within this time unit.While time-equivalent sedimentary successions in other regions such as South China have been studied in great detail (e.g. Sun et al., 2012; Romano et al., 2013, for more literature), the Transcaucasian and NW Iranian sections are known from fewer studies. Although sections in this region have attracted scientists for a long time (Abich, 1878; Frech and Arthaber, 1900; Bonnet and Bonnet, 1947), detailed lithostratigraphical and biostratigraphical studies of the Changhsingian sections in the Transcaucasus and NW Iran have only rarely been carried out. An exception is the conodont succession in these outcrops, which has been studied in greater detail by Kozur et al. (1980), Sweet and Mei (1999a, b), Partoazar (2002), Kozur (2004, 2005, 2007), Henderson et al. (2008) and Shen and Mei (2010). In addition, several investigations focused on the stable isotopes of the NW Iranian sections, such as δ 13 C (Baud et al., 1989; Korte et al., 2004; Richoz, 2006; Korte and Kozur, 2010; Richoz et al., 2010), δ 18 O (Schobben et al., 2013) and a Ce anomaly (Kakuwa and Matsumoto, 2006). These studies demonstrate the high potential for a subdivision of the Changhsingian stage of sections in the Palaeotethys, comparable or even finer than in the more intensely studied sections in South China.In the following we present a correlation of lithostratigraphical data and the distribution of conodonts and ammonoids. It will be shown that the Changhsingian stage cannot only be subdivided into a number of zones by means of conodonts, but also of ammonoids. These two biostratigraphical subdivisions are supported by lithological characteristics.