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International Journal of Geography and Geology

April 2015, Volume 4, 4, pp 68-77

Microbiostratigraphy and Lithostratigraphy of the Upper Permian Dalan Formation in Kuh-E-Surmeh (Zagros Basin, Southwest Iran)

Pedram Rafiee


Dariush Baghbani


Ali Aghanabati


Mehran Arian

Pedram Rafiee 1 ,

Dariush Baghbani 2
Ali Aghanabati 3
Mehran Arian 1 
  1. Department of Geology, Science and Research Branch, Islamic Azad University (IAU), Tehran, Iran 1

  2. Department of Geology, Damavand Branch, Islamic Azad University (IAU), Tehran, Iran 2

  3. Department of Geology, North Tehran Branch, Islamic Azad University (IAU), Tehran, Iran 3

Pages: 68-77

DOI: 10.18488/journal.10/2015.4.4/

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The objective of the present study is to perform Microbiostratigraphy and Lithostratigraphy of the Upper Permian Dalan Formation in Kuh-e-Surmeh (Zagros Basin). The Upper Permian Dalan Formation contains vast gas reservoirs in the southwest Iran and is composed of three Members: The Lower Dalan Member is Wordian to Capitanian in age; the Nar Member is latest Capitanian and the Upper Dalan Member corresponds to Wuchiapingian to Changhsingian. Lower and Upper Dalan Members include mainly limestone, dolomite and Nar member mostly consist of anhydrite and thin interlayer of dolomite toward the base. The biostratigraphic study allows individualizing Foraminifers from the Roadian to the Changhsingian (Middle to Late Permian). Based on the stratigraphic distributions of the Biostratigraphically significant fauna and flora the following 5 biozones and age determinations are proposed in the Upper Permian Dalan Formation: 
1. Paraglobivalvulinoides septulifera zone (Changhsingian)
2. Paradagmarita zone (Changhsingian)
3. Shanita zone (Middle - Late Capitanian)
4. Schwagerina zone (Wordian - Middle Capitanian)
5. Neoendothyra zone (Roadian)

Contribution/ Originality
This study is one of very few studies which have investigated the Permian sequences of different layers in Kuh-e-Surmeh (Zagros Basin). The results of this study will help to make Paleogeographic maps, interpretation of Permian Basin, Recognition of lithology specificities and Separation and definition of the Permian sequence.




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