SYSTEMATICS AND BIOSTRATIGRAPHY OF THE UPPER DEVONIAN ROCKS BASED ON BRACHIOPODA IN THE MEYGHAN AREA (NORTH EAST IRAN)

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HOSSEININEZHAD SEYED MAHMOUD; YAZDI M.; KEBRIAEI ZADEH M.R.

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Journal: JOURNAL OF SCIENCE (UNIVERSITY OF TEHRAN) (JSUT) Year:2006 | Volume:32 | Issue:3 (SECTION GEOLOGY 2) Page(s): 83-100

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Title

SYSTEMATICS AND BIOSTRATIGRAPHY OF THE UPPER DEVONIAN ROCKS BASED ON BRACHIOPODA IN THE MEYGHAN AREA (NORTH EAST IRAN)

Author(s)

HOSSEININEZHAD SEYED MAHMOUD | YAZDI M. | KEBRIAEI ZADEH M.R. | Issue Writer Certificate

Keywords

BRACHIOPODAQ3

FAMENNIANQ3

KHOSHYEILAGH FORMATIONQ3

MEYGHANQ3

ANNULATAQ3

Abstract

Meyghan area is located 34 km north of Shahrud. The measured and studied strati graphical column is mainly composed of limestone, argillaceous limestone and shale. The brachiopods of stratigraphical column of MEYGHAN area were studied and resulted in 50 species such as Ripidiorhynchus elburzensis, Spiatrypina chitralensis, Cyphotherorhynchus arapaensis, Pampoecilorhynchus arianus, Leptocaryorhynchus jamensis, Schiziphoria impressa, Aulacella interlineata, Cleiothyridina coloradensis, Paurogastroderhynchus bikniensis, Athyis tau, Araratella dichotomians assimulata, Megalopter.orhynchus chanakchiensis, Prospira struniana. Based upon their stratigraphical distributions, the encountered brachiopod species are divided into three biozones. The biozone I is marked by brachiopod genera such as Ripidiorhynchus and Spiatrypina and indicates the middle-late Frasnian. The biozone 2 is characterized by the brachiopod genera Pampoecilorhynchus and Leptocaryorhynchus, suggesting the early-middle FAMENNIAN. The biozone 3 is introduced by brachiopod genera, consisting of Paurogastroderhynchus, Megalopterorhynchus and Athyris, representing the Late FAMENNIAN. Based on the above-mentioned biozones, the uppermost part of KHOSHYEILAGH FORMATION is assigned to the late FAMENNIAN (Strunian) in the MEYGHAN section. Furthermore, there is a sedimentary horizon at the top of KHOSHYEILAGH FORMATION, which contains iron-stained brachiopod and other shelly fauna such as ammonoids. Such a phenomenon corresponds to the global Annullata event (Hembergian, IV-A zone) which has also been reported from other countries such as China and Morocco.

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APA: Copy

HOSSEININEZHAD, SEYED MAHMOUD, YAZDI, M., & KEBRIAEI ZADEH, M.R.. (2006). SYSTEMATICS AND BIOSTRATIGRAPHY OF THE UPPER DEVONIAN ROCKS BASED ON BRACHIOPODA IN THE MEYGHAN AREA (NORTH EAST IRAN). JOURNAL OF SCIENCE (UNIVERSITY OF TEHRAN) (JSUT), 32(3 (SECTION GEOLOGY 2)), 83-100. SID. https://sid.ir/paper/2294/en

Vancouver: Copy

HOSSEININEZHAD SEYED MAHMOUD, YAZDI M., KEBRIAEI ZADEH M.R.. SYSTEMATICS AND BIOSTRATIGRAPHY OF THE UPPER DEVONIAN ROCKS BASED ON BRACHIOPODA IN THE MEYGHAN AREA (NORTH EAST IRAN). JOURNAL OF SCIENCE (UNIVERSITY OF TEHRAN) (JSUT)[Internet]. 2006;32(3 (SECTION GEOLOGY 2)):83-100. Available from: https://sid.ir/paper/2294/en

IEEE: Copy

SEYED MAHMOUD HOSSEININEZHAD, M. YAZDI, and M.R. KEBRIAEI ZADEH, “SYSTEMATICS AND BIOSTRATIGRAPHY OF THE UPPER DEVONIAN ROCKS BASED ON BRACHIOPODA IN THE MEYGHAN AREA (NORTH EAST IRAN),” JOURNAL OF SCIENCE (UNIVERSITY OF TEHRAN) (JSUT), vol. 32, no. 3 (SECTION GEOLOGY 2), pp. 83–100, 2006, [Online]. Available: https://sid.ir/paper/2294/en

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