Biostratigraphy of Yazdanshahr No.2 section in Kerman area, Central Iran, based on conodont communities

Bioestratigrafía de la sección Yazdanshahr No.2 en el área de Kerman, Irán central, con base en comunidades de conodontos

Ehsanollah Nasehi^1,*, Mohammad Amin Nasehi²

¹ Department of Geology, Faculty of Sciences, Islamic Azad University, Khorasgan branch, Esfahan, Iran.

² School of Geology, College of Science, University of Tehran, Tehran, Iran.

* Corresponding author: (E. Nasehi) This email address is being protected from spambots. You need JavaScript enabled to view it.

How to cite this article:

Nasehi, E., Nasehi, M. A., 2023, Biostratigraphy of Yazdanshahr No.2 section in Kerman area, Central Iran, based on conodont communities: Boletín de la Sociedad Geológica Mexicana, 75 (1), A300822. http://dx.doi.org/10.18268/BSGM2023v75n1a300822

Manuscript received: March 6, 2022; Corrected manuscript received: August 29, 2022; Manuscript accepted: September 9, 2022.

ABSTRACT

Yazdanshahr No.2 section, which consists mostly of Bahram and Sibzar formations is located in the Zarand city, northern Kerman province (Central Iran). Five biozones have been identified based on the conodont community. The first biozone, which includes Padehat (15 meter) and Sibzar formations (75 meter), was distinguished based on genera Bipennatus and Icriodus and the probable corresponding age was considered to span Emsian to Eifelian. The second biozone is recognized by the first appearance of index taxon Polygnathus varcus (varcus Zone: early to middle Givetian). The third biozone starts with the firth appearance of the index genus Icriodus expansus (expansus zone: middle Givetian). The base of the Fourth biozone is recognized by the first appearance of the genus I. subterminus (subterminus Zone: middle to late Givetian) and the last biozone was distinguished with the first appearance of genera Ancyrodella and Polygnathus incompletes in the Givetain-Frasnian boundary (falsiovalis to crepida Zone?: Frasnian to Famenian?). Bahram Formation (94 meter) consists of Fossiliferous limestone (varcus to subterminus Zone) at the lower part, and alternation of dolomite and sandstone (falsiovalis to crepida Zone?) at the upper part. Sibzar Formation consists of Middle Devonian dolomite and limy dolomite containing intercalation of sandstone and limestone layers.

Keywords: Icriodus, Polygnathus, biozones, Bahram Formation, Devonian, Kerman, Iran.