Document Type : Original Research Paper

Authors

1 Department of Geology, Science and Research Branch, Islamic Azad University, Tehran, Iran

2 Department of Geology, Earth Sciences Research Center, Zahedan Branch, Islamic Azad University, Zahedan, I. R. Iran.

3 Department of Geology, science and research branch, Islamic Azad university

4 Earth Sciences Research Institute, Geological Survey of Iran, Tehran, Iran

10.22071/gsj.2022.341732.1998

Abstract

the Shishtou section is located in the north of Tabas . Ghezelin and Asselian sequences of Zaladou Formation with 60 m thickness are divided into five units, includes sandstone, limestone, shale, sandy limestone and limestone. The lower boundary of the Gzhelian deposits with disconformity on top of the Moscovian deposits of the Abshani Formation. The upper boundary of these deposits with the Tighe-Madanou Formation is continuous. Assembelage of fusulinids in the Shishtou section such as Ruzhenzevites-Rauserites-Triticites are identified in the upper part of Gzhalian previously reported from equal deposits in Darvaz, Fergana, Southern Urals, Donetsk and Carnic of Alps, as well as, Central Iran , Central Alborz and Sanandaj-Sirjan zones. Also, different species of Sphaeroschwagerina, Pseudoschwagerina and Likharevites, which illustrate the Asselian age, represent the Carboniferous-Permian boundary in the studied section and allow for comparability with other structural-sedimentary zones of Iran, including Central Iran , Central Alborz (Doroud Group) and Sanandaj-Sirjan zone.This equivalence expresses the transgressive of sea level in different parts of Iran in the late Carboniferous and early Permian periods.In Shishto section 15 genera ,35 species and 2 subspecies of Fusulins have been identified, some of which are reported for the first time from Iran.

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