Scientific Quarterly Journal of Geosciences

Scientific Quarterly Journal of Geosciences

Biostratigraphy of index Brachiopods and Conodonts of Shishtu Formation in the East of Tabas (Niaz Section)

Document Type : Original Research Paper

Authors
Mohammad Reza Kebria-ee 1
Mahdi Yazdi 2
Ali Hamedani 2
1 Department of Geology, Payam- Noor University
2 Department of Geology, Faculty of Sciences, Esfahan University, Esfahan , Iran
Abstract
The Niaz section is located in 22 Km East of Tabas. The thickness of Shishtu Formation is about 14 meters and its lithology consists of coraly biostrome, nodular limestone and marly limestone with abundant fossils (especially brachiopods). Brachiopods of the section were collected and twenty species identified as follows:
Schizophoria striatula, Aulacella cf. eifeliensis, Gypidula sp.,Coeloterorhynchus tabasensis, Spinatrypina bodini, Spinatrypina chitralensis, Spinatrypina cf. robusta,  Desquamatia sp., Athyris chitralensis, Athyris cf. concentrica, Athyris sp., Anathyris sp., Crurithyris cf. inflata, Cyrtospirifer sp.,   Cyrtospirifer cf. minor, Indospirifer sp., Warrenella sp., Caucasiproductus sardarensis, Productella e. g. belanskii, Spinulicosta sp.,
In addition, conodont specimens were collected  from brachioped – bearing beds. Ident lified conodonts are as follows:
Palmatolepis winchelli, Palmatolepis sp, Palmatolepis sp, Ancyrodella curvata, Ancyrodella nodosa, Icriodus alternatus alternatus, Icriodus expansus, Polygnathus webbi, Polygnathus capolloci, Polygnathus evidence.
As a result, the accurate age for Shishtu Formation (member 1) based on the its brachiopods and conodonts can be proposed as Late Frasnian (linguiformis Zone).
Keywords
Brachiopoda
Conodont
Nias section
Shishtu Formation
Frasnian

Subjects

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Scientific Quarterly Journal of Geosciences
Volume 14, Issue 53
Autumn 2004, Vol. 14, No. 53
Autumn 2004
Pages 118-131