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7. Oxfordian belemnites and ammonites from Rostam Kola, Northern East Alborz, North Iran

Author

Mariotti, Nino, Weis, Robert, Falahatgar, Mostafa, Parent, Horacio, and Javidan, Mojtaba

Subjects
Oxfordian, Belemnites, Lar Formation, Ammonites, Iran, East Alborz
Abstract

A Middle Oxfordian Jurassic belemnite fauna, associated with ammonites, from the Lar Formation at Rostam Kola (North Iran) is described for the first time. The specimens have been assigned to the following taxa: Hibolithes hastatus, Hibolithes aff. beyrichi, Pachybelemnopsis latesulcatus, Duvalia didayana, Duvalia monsalvensis, Rhopaloteuthis cf. argoviana and Rhopaloteuthis sauvanausa. Ammonites collected from the same belemnite bearing levels allow to refer the belemnite fauna to the Middle Oxfordian Transversarium Zone. Only a few Tethyan belemnite assemblages are recorded in the Middle Oxfordian, but it is possible to establish a close affinity with the taxa of the Mediterranean Province. The ammonites associated with the belemnites as also the ammonites from the upper levels of the section show clear Submediterranean affinities. All the ammonites known from previous and present surveys in the study area belong to the families Perisphinctidae and Ataxioceratidae. The species in new samples are Perisphinctes cf. parandieri, Perisphinctes (Subdiscosphinctes) sp. A, Orthosphinctes sp. A, Orthosphinctes sp. B, Lithacosphinctes? sp. A and Passendorferia cf. gygii. Fil: Mariotti, Nino. Dipt. di Scienze della Terra, Univ. La Sapienza. Roma, Italy. Fil: Weis, Robert. Section Paléontologie, Musée national d’histoire naturelle, Grand-duchy of Luxembourg. Fil. Parent, Horacio. Laboratorio de Paleontología, IFG-FCEIA, Universidad Nacional de Rosario, Argentina.

Published
2013

10. A lower Viséan (Carboniferous) brachiopod fauna from the eastern Alborz Mountains, northern Iran, and its palaeobiogeographical implications.

Author

Qiao, Li, Falahatgar, Mostafa, and Shen, Shu‐Zhong

Subjects
*BRACHIOPODA, *PALEOGEOGRAPHY, *STROPHOMENIDA, *SPIRIFERIDA
Abstract

The brachiopods from the upper part of the Mobarak Formation at the Kiyasar section in the eastern Alborz Mountains, northern Iran, have been studied in detail. Fifteen species assigned to 13 genera of Strophomenida, Orthotetida, Orthida, Productida, Athyridida and Spiriferida are described. The fauna is determined as early Viséan in age based on the presence of Eomarginifera paucispinosa, Grandispirifer mylkensis and Unispirifer sp., and their associated foraminifers Uralodiscus, Paraarchaediscus, Glomodiscus and Endothyra, though taxa ranging through the Tournaisian-Viséan are also present. A comparison of its palaeogeographical affinities with other faunas show that the Alborz brachiopod fauna maintains strong Palaeotethyan affinities based on its general similarities with those of Eurasia, North America and Australia. This is suggestive of a prevailing oceanic current that circulated between the northern and southern shelf sea of the Palaeotethys Ocean, with which the warm-water brachiopod taxa were widespread in the Palaeotethyan Realm through the early Viséan. Copyright © 2016 John Wiley & Sons, Ltd. [ABSTRACT FROM AUTHOR]

Published
2017
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