First report of Mid Ordovician (Darriwilian) cephalopods from the Saluk Mountains, southern Kopet-Dagh Region, north-east Iran

 

Authors: Evans DH, Ghobadi Pour M, Popov LE, Jahangir H

Published in: Bulletin of Geosciences, volume 96, issue 2; pages: 139 - 158; Received 27 July 2020; Accepted in revised form 14 January 2021; Online 7 February 2021

Keywords: Ordovician, Darriwilian, Pelmis Formation, Cephalopoda, Orthoceratida, palaeobiogeography, peri-Gondwana, Kopet-Dagh, Iran,

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Abstract

An assemblage of orthoconic cephalopods collected from oolitic ironstones at the base of the Pelmis Formation (New) of the Saluk Mountains of the southern Kopet-Dahg Region of north-eastern Iran indicate that the base of the Pelmis Formation is likely to be Darriwilian in age. Preservation of the assemblage suggests that it is time averaged and may represent a condensed deposit. The assemblage consists of a single endoceratid, several members of the Orthoceratida as well as an indeterminate taxon. Overall, the assemblage shows affinities with South China and Baltica, as well as with other Middle Ordovician cephalopod assemblages recorded from Iran.

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