Early Barremian orbitolinid record from the Moghan area,NW Iran: Northern margin of the Neotethys |
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| Institution: | 1. National Iranian Oil Company Exploration Directorate, Sheikh Bahayi Square, 1994814695 Tehran, Iran;2. School of Earth Sciences, Damghan University, 36716-41167 Damghan, Iran;3. Department of Geology, Faculty of Sciences, University of Tehran, Tehran, Iran;1. Department of Geology, Payame Noor University, Shiraz, Iran;2. 1 rue des Tilleuls, 59152 Gruson, France;3. School of Earth Sciences, Damghan University, Damghan, Iran;1. Université de Genève, Faculté des Sciences, Département des Sciences de la Terre, Rue des Maraîchers 13, CH 1205, Genève, Switzerland;3. 71 Chemin de Planta, 1223, Cologny, Switzerland;4. Les Repingons, 24 Chemin des Champs d''Amot, 74140, Messery, France;5. I.G.M.E., Spirou Loui 1, Olympic Village, 13677, Acharnes, Greece;1. Dokuz Eylul University, Engineering Faculty, Geological Engineering Department, Tınaztepe Campus, 35160 Buca, İzmir, Turkey;2. University of Gabes, Faculty of Sciences of Gabes, Geology Department, Gabes, Tunisia;3. University of Tunis el Manar, Faculty of Sciences of Tunis, Structural and Applied Geology Laboratory, Tunis, Tunisia;1. Lerchenauerstr. 167, D-80935 München, Germany;2. Senckenberg Naturhistorische Sammlungen, Königsbrücker Landstraße 159, D-01109 Dresden, Germany;1. Department of Geology, Faculty of Sciences, University of Neyshabur, Neyshabur, Iran;2. Botany Research Division, Research Institute of Forests and Rangelands, Agricultural Research, Education and Extension Organization (AREEO), Tehran, Iran;3. Department of Geology, Faculty of Sciences, Ferdowsi University of Mashhad, Mashhad, Iran |
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| Abstract: | Orbitolinid foraminifers are reported for the first time from lower Barremian shallow marine carbonate deposits of the Moghan area, NW Iran. According to geologic map of the Razi, these rocks were previously assigned to general age of the Early Cretaceous. The early Barremian age is documented based on stratigraphic range of the marker Valserina turbinata (Foury). Other orbitolinids such as Eopalorbitolina charollaisi Schroeder, Eopalorbitolina pertenuis (Foury), Paleodictyoconus cf. cuvillieri (Foury), Montseciella cf. alguerensis Cherchi and Schroeder, Paracoskinolina cf. maynci (Chevalier), Orbitolinopsis cf. buccifer Arnaud-Vanneau and Thieuloy, and Dictyoconus? pachymarginalis Schroeder also coexist. Obtained biostratigraphic data suggest that the range of Dictyoconus? pachymarginalis, hitherto known from the Aptian, has to be extended into the early Barremian. Most of the orbitolinid taxa are well known in Europe as northern Tethyan margin endemic forms. Therefore, the study area can be considered as part of the northern Tethys margin during the Barremian. This study also extends the palaeobiogeographic distribution of northern Tethyan orbitolinids eastwards as far as northwest Iran. |
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| Keywords: | Orbitolinids Barremian Tethys Iran Moghan Micropaleontology |
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