{"title":"First report of Mid Ordovician (Darriwilian) cephalopods from the Saluk Mountains, southern Kopet-Dagh Region, north-east Iran","authors":"D. H. Evans, M. Ghobadi, L. Popov, H. Jahangir","doi":"10.3140/BULL.GEOSCI.1808","DOIUrl":null,"url":null,"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. • Key words: Ordovician, Darriwilian, Pelmis Formation, Cephalopoda, Orthoceratida, palaeobiogeography, peri-Gondwana, Kopet-Dagh, Iran.","PeriodicalId":9332,"journal":{"name":"Bulletin of Geosciences","volume":" ","pages":""},"PeriodicalIF":1.5000,"publicationDate":"2021-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"2","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Bulletin of Geosciences","FirstCategoryId":"89","ListUrlMain":"https://doi.org/10.3140/BULL.GEOSCI.1808","RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"GEOSCIENCES, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 2
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. • Key words: Ordovician, Darriwilian, Pelmis Formation, Cephalopoda, Orthoceratida, palaeobiogeography, peri-Gondwana, Kopet-Dagh, Iran.
期刊介绍：
The Bulletin of Geosciences is an international journal publishing original research papers, review articles, and short contributions concerning palaeoenvironmental geology, including palaeontology, stratigraphy, sedimentology, palaeogeography, palaeoecology, palaeoclimatology, geochemistry, mineralogy, geophysics, and related fields. All papers are subject to international peer review, and acceptance is based on quality alone.
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