Scientific Quarterly Journal of Geosciences

Scientific Quarterly Journal of Geosciences

Revision in stratigraphic position of the Cephalopod Bed and the boundary between Devonian and Carboniferous and to introducing 5 Conodont zones in Hoze-Dorah (East Iran)

Document Type : Original Research Paper

Author
Alireza Ashuri
Ferdowsi University, Mashhad, Iran
Abstract
Conodonts of Cephalopod Bed of Shishtu Formation in its reference section in Howz-e-Dorah, south of Shotori Range, has been studied. The Cephalopod Bed, mainly consists of red oolittic limestone and shale which has a rich macrofossil fauna of cephalopoda, brachiopoda, corals and also a good fauna of conodonts.
Conodont study reveals an age of Late Frasnian to Late Famennian for the Cephalopod Bed. A condont zone in the Late Frasnian (gigas) and conodont zones in Famennian (Palmatolepis triangularis, rhomboidea and expansus) also have been introduced.
The previous studies indicated Devonian -Carboniferous boundary in a succession of 82 meters thick, which is overlain the Cephalopod Bed (Stocklin et al. 1965 and Stepanov, 1971). In this study the succession which contains Devonian- Carboniferous boundary reduced to 10 meters.
In Carboniferous conodont fauna the conodont zone of anchoralis- latus has been introduced.
Keywords
Conodont, Cephalopod, Carboniferous, Hoze-Dorah

Subjects

Ashouri, A.R. 1990. Devonian and Carboniferous conodont faunas from Iran, University of Hull (unpublished thesis). 
Ruttner, A. and Stocklin,J., 1966, Foreword in contribution to the Paleontology of east Iran. Geol. Surv. Iran, 6:
Stepanov, D.L. 1967. Carboniferous stratigraphy of Iran. Geol. Surve, Iran, Library report. (unpublished).
Stepanov, D.L.1971. Carboniferous stratigraphy of Iran. C.R. Ceme cong. Strat. Carbon., 4:
Stocklin, L., Eftekhar Nezhad, J. and Hushmand- Zadeh, A. 1965 Geology of the Shotori Range (Tabas area, East Iran). Geol. Surv. Iran, 3:
Walliser, O.H.1966. Preliminary notes on Devonian/ Lower and Upper Carboniferous goniatites in Iran in contributions to the paleontology of east Iran. Geol. Surv. Iran.
Wendt. J., Hayer, J. & Karimi Bavandpour, A. (1977). Stratigraphy and depositional environment of Devonian sediments in northeast and east- central Iran. N.Jb. Geol. Palaont. Abh., 206: 227-322: Stutgart.
Scientific Quarterly Journal of Geosciences
Volume 7, 25-26
Autumn & Winter 1998, vol. 7, No. 25-26
Winter 1998
Pages 10-17