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Journal of Micropalaeontology An open-access journal of The Micropalaeontological Society
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Volume 27, issue 2
J. Micropalaeontol., 27, 125–134, 2008
https://doi.org/10.1144/jm.27.2.125
© Author(s) 2008. This work is distributed under
the Creative Commons Attribution 4.0 License.
J. Micropalaeontol., 27, 125–134, 2008
https://doi.org/10.1144/jm.27.2.125
© Author(s) 2008. This work is distributed under
the Creative Commons Attribution 4.0 License.

  01 Nov 2008

01 Nov 2008

Dinoflagellate cysts from the Upper Triassic (Norian) of northeastern Iran

Ebrahim Ghasemi-Nejad1, Martin J. Head2, and Maryam Zamani1 Ebrahim Ghasemi-Nejad et al.
  • 1Department of Geology, Faculty of Sciences, University of Tehran, Enghelab Ave., Tehran, Iran (e-mail: [Ghasemi-Nejad])
  • 2Department of Earth Sciences, Brock University, St. Catharines, Ontario, Canada L2S 3A1 (e-mail: )

Keywords: dinoflagellate, Miankuhi, Aghdarband, Triassic, Iran

Abstract. Upper Triassic (Norian) strata of the Miankuhi Formation in northeastern Iran have been studied palynologically, revealing a diverse but poorly preserved association of dinoflagellate cysts. Based on representatives of the genera Hebecysta, Heibergella, Rhaetogonyaulax and Sverdrupiella, the strata are assigned to the middle of the Hebecysta balmei Zone with an inferred age of early Late Norian. The association shows similarities with assemblages from Australia, New Zealand, Indonesia, Northwest Europe, arctic Canada and Alaska, indicating an interconnection of warm Tethyan waters during the Late Triassic. The occurrence of Sverdrupiella species in the clastic, near-shore marine deposits of Miankuhi, and their presence in similar sedimentary facies world-wide, indicate that this genus was well adapted to clastic shallow-marine environments.

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