Paper Information

Journal:   JOURNAL OF SCIENCES (ISLAMIC AZAD UNIVERSITY)   FALL 2007 , Volume 17 , Number 65 (GEOLOGY ISSUE); Page(s) 127 To 150.
 
Paper: 

MICROBIOSTRATIGRAPHY OF THE ASMARI FORMATION IN ALAMDAR SECTION, NORTHEAST BEHBAHAN

 
 
Author(s):  DANESHIAN JAHANFAR*, KHOSROU TEHRANI KH., ESMAEILI GHAYOUM ABADI ABOU ALGHASEM, HOSSEIN ZADEH MAHDI
 
* GEOLOGY DEPARTMENT, TARBIAT MOALLEM UNIVERSITY, TEHRAN, IRAN
 
Abstract: 

This research deals with the microbiostratigraphic analysis of the one outcrop section from the Asmari Formation in northeast of Behbahan, Khuzestan province. The sediments of the examined section comprise of limestone with 256.62 m thick. In Alamdar Section, the Asmari Formation conformably lies on the shales ofPabdeh Formation, and underlies the marls of the Gachsaran Formation. The study of 109 samples from the mentioned section led us to identify 36 genera and 56 species of benthonic foraminifera, one genus and species of planktonic foraminifera, 5 genera and species of the red algae, and two genera and species of bryozoa.
On the basis of stratigraphic distribution of benthonic microfossils, the age of Alamdar Section is Oligocene (? Late Rupelian- Chattian) to Early Miocene (Aquitanian- Burdigalian).
The microfossils assemblage in the examined section are comparable to the Borelis melo group- Meandropsina iranica Assemblage Zone, Miogypsinoides- Archaias- Valvulinid Assemblage Zone and Eulepidina- Nephrolepidina- Nummulites Assemblage Zone of Adams and Bourgeois (1967), and the biozones 56, 57, 59, 60 and 61 of Wynd (1965).

 
Keyword(s): ASMARI FORMATION, BEHBAHAN, MICROFOSSILS, BIOSTRATIGRAPHY
 
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