New data on the Rectogordius (foraminifera) abundance zone (Latest Carboniferous: Gzhelian) of the Zaladou Formation (east-central Iran,Tabas block,Shishtu section) |
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Authors: | Ali Jalali Hamed Yarahmadzahi Daniel Vachard Mehran Arian Abdollah Saidi Mohsen Aleali |
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Institution: | 1. Department of Earth sciences, Science and Research branch, Islamic Azad University, Tehran, Iran;2. Department of Geology, Earth Sciences Research Center, Zahedan Branch, Islamic Azad University, Zahedan, Iran;3. University of Lille, UMR CNRS 8198 Evo-Eco-Paleo, SN5, 59655 Villeneuve d’Ascq Cedex, France;4. 1 Rue des Tilleuls, 59152 Gruson, France;5. Geological Survey of Iran, Tehran, Iran |
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Abstract: | The Rectogordius (Foraminifera) abundance zone is described in the east of the Shishtu village in the Ozbak Kuh Mountain. The samples were collected in the Zaladou Formation., which is 60 m thick and composed of shales, sandstones, sandy limestones, microconglomerate, bioclastic limestones, coral limestone and fusulinid limestones. The Rectogordius abundance zone was found in sandy bioclastic limestone. It displays two species and three subspecies of this foraminifer, including Rectogordius iranicus, R. iranicus gadukensis, R. minimus and R. minimus shishtuensis n. subsp., R. iranicus ozbakensis n. subsp. The age of this abundance zone is considered to be Gzhelian, due to the distribution of Rectogordius in Central Iran (Ozbak Kuh; Zaladou Formation), central and eastern Alborz (Emarat Fm.), Sanandaj-Sirjan zone (Vazhnan Formation), as well as in the Donets, Arctic Canada, Afghanistan, and the Carnic Alps. The genus Rectogordius is possibly restricted to the northern Paleotethys margin, northern Cimmerian margin, shelf of the Uralian Ocean as far as the northernmost part of North America. Two new subspecies Rectogordius minimus shishtuensis n. subsp. and Rectogordius iranicus ozbakensis n. subsp. are described. |
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Keywords: | Late Carboniferous Foraminifera Abundance zone New subspecies Central Iran Carbonifère supérieur Foraminifères Zone d’abondance Nouvelles sous-espèces Iran central |
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