Biostratigraphy of Asmari Formation in Ghare Agha seyed of Farsan region, Chaharmahale Bakhtiari Province, Iran

Seyed Ahmad Babazadeh; Seyedeh Malihe Hamidzadeh

doi:10.3969/j.issn.1673-9736.2017.03.02

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Global Geology ›› 2017, Vol. 20 ›› Issue (3) : 144-152. DOI: 10.3969/j.issn.1673-9736.2017.03.02

Articles

Biostratigraphy of Asmari Formation in Ghare Agha seyed of Farsan region, Chaharmahale Bakhtiari Province, Iran

Seyed Ahmad Babazadeh¹, Seyedeh Malihe Hamidzadeh²

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Abstract

The Asmari Formation consists of shallow marine sedimentary rocks deposited on ramp setting. Larger benthic foraminifera collected from Asmri Formation are dominated by hyaline and porcelanouse forms, including Amphistegina, Nummulites, Archaias, Astrotrillina, Miogypsinella, Miogypsinoides, Lepidocyclina, Operculina, Spiroclypeous and Miliolids. The presence of Nummulites cf. vascus in the lower part of the formation allows the age to be determined as Rupelian. The occurrence of Borelis pygmae is an index taxon of the Rupelian-Chattian and indicates Early Chattian of SBZ 21-22 in the study section. The first appearance of Miogypsinella akadagensis shows Late Chattian (SBZ 23) and defines the upper boundary of the SBZ 21-22. The new data are the first evidences showing that the shallow marine Asmari Formation is attributed to Oligocene (Rupelian-Chattian) age for this region.

Key words

Asmari Formation / biozone / Oligocene / Ghare Agha seyed / Farsan region / Iran

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Seyed Ahmad Babazadeh, Seyedeh Malihe Hamidzadeh. Biostratigraphy of Asmari Formation in Ghare Agha seyed of Farsan region, Chaharmahale Bakhtiari Province, Iran[J]. Global Geology. 2017, 20(3): 144-152 https://doi.org/10.3969/j.issn.1673-9736.2017.03.02

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