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Late Ordovician and early Silurian brachiopods from the Zagros Ranges, Iran

Published online by Cambridge University Press:  01 June 2015

Mohammad Ghavidel-Syooki ,
Leonid E. Popov ,
Mansoureh Ghobadi Pour ,
J. Javier Álvaro  and
Mohammad H. Ehsani
Mohammad Ghavidel-Syooki*
Affiliation:
Institute of Petroleum Engineering, Technical Faculty of Tehran University, P.O. Box 11365-4563, Tehran, Iran. Email: m_ghavidelsyooki@yahoo.com; mh_ehsani@hotmail.com
Leonid E. Popov*
Affiliation:
Department of Geology, National Museum Cardiff, Cathays Park, Cardiff CF10 3NP, Wales, UK. Email: Leonid.Popov@museumwales.ac.uk; lepbarry@yahoo.co.uk
Mansoureh Ghobadi Pour
Affiliation:
Department of Geology, Faculty of Sciences, Golestan University, Gorgan 49138-15739, Iran. Email: mghobadipour@yahoo.co.uk
J. Javier Álvaro
Affiliation:
Centre of Astrobiology (CSIC/INTA), Ctra. de Torrejón a Ajalvir km 4, 28850 Torrejón de Ardoz, Spain. Email: alvarobjj@cab.inta-csic.es
Mohammad H. Ehsani
Affiliation:
Institute of Petroleum Engineering, Technical Faculty of Tehran University, P.O. Box 11365-4563, Tehran, Iran. Email: m_ghavidelsyooki@yahoo.com; mh_ehsani@hotmail.com
*
*Corresponding authors
*Corresponding authors
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Abstract

Brachiopods are among the most common components of the Late Ordovician benthic faunal assemblages recorded in the Faraghan Mountains, Zagros Ranges, Iran. A total of 19 species referable to 16 genera are identified, including seven new species; namely Drabovia elegans, Hibernodonta bonehensis, Hedstroemina zakeenensis, Jezercia faraghani, Protomendacella multicostata, Tafilaltia dargazensis and Tafilaltia seyahouensis. Reported brachiopod assemblages are oligotaxic (2–3 species per assemblage) to monotaxic. The only exception is the medium diversity Aegiromena-Hedstroemina Association, with up to ten species, which occurs at the lower part of the A. nigerica Zone. Low diversity patterns were probably controlled by the palaeogeographical position of the region in high southern latitudes throughout the Ordovician. Paterula sp. and Iranospirifer sp. are the only brachiopods documented from the Silurian (Llandovery) Sarchahan Formation. This paper gives the first detailed report of shelly fossils from the Llandovery ‘hot shale’ of the Arabian margin of Gondwana. Most of the Katian genera, and many of their species, are shared with neighbouring high- to mid-latitude peri-Gondwanan margins, including Morocco, Spain, France, Sardinia and Bohemia.

Keywords

biofaciesbiogeographyFaraghan MountainsGondwanaKatianLlandovery

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Type
Articles
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Earth and Environmental Science Transactions of The Royal Society of Edinburgh , Volume 105 , Issue 3 , September 2014 , pp. 159 - 187
Copyright
Copyright © The Royal Society of Edinburgh 2015 

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