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Abstract
Brachiopods from the Early Carboniferous of North Iran: Classification, Biostratigraphy and Paleobiogeography Maryamnaz Bahrammanesh Tehrani Dottorato di Ricerca in Scienze della Terra, XXI Ciclo Abstract The brachiopod fauna from the Corboniferous Mobarak Formation from the eastern Alborz Mountains, North Iran has been analyzed. A total number of 745 specimens has been sampled in the Abrendan section, north of Damghan. The collected material has been prepared and classified into 36 species, 27 genera, 5 subfamilies. The brachiopod genera documented in the collection are Leptagonia, Geniculifera, Buxtonia, Marginatia, Tomiproductus, Pustula, Schellwienlla, Rhipidomella, ?Ptychomaletoechia, Hemiplethorhynchus, Rossirhynchus, Paraphorhynchus, Athyris, Cleiothyridina, Gerankalasiella, Composita, Densalvus, Martinia, Ectochoristites, Athylopherous, Paralellora, Unispirifer, Imbrexia, Fusella, Syringothyris, Pseudosyrinx. The Rostrochonc mollusc Hippocardia has been also found. The biostratigraphic
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analysis of the brachiopod assemblages allowed the recognition of three concurrent range biozones: the Schizophoria resupinata-Pseudosyrinx sp. ind. biozone, the Composita subquadrata-Geniculifera sp. ind. biozone, and the Cleiothyridina kusbassica-Unispirifer striatoconvolutus biozone. Most of the brachiopod taxa range from the Tournaisian to the Visean. Some of them are restricted to the Tournaisian, confirming the age suggested by foraminifers. The statistical of paleogeographical analysis shows that North Iran brachiopods are mostly close to coeval faunas from N America and Russia. This confirms the presence of an equatorial current flowing south eastward along the Gondwanan margin.
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| 4131 | |
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| D. 2009 0368 |
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Autorizzazione: si. |