Writers : F. Goishani; M. Bahrammanesh
Refference : Geosciences Scientific Quarterly Journal,No.:31-32,P.:64
Publishing Year : 1378

Abstract :
The Upper Permian brachiopods of Baladeh area, central Alborz were compared and correlated paleogeographically and paleoecologically with Shahreza-Abadeh region, central Iran, as well as Jolfa, northwestern area of Iran.
In order to reach a satisfactory conclusion, numerous brachiopods(200 specimens)from the Upper Permian Nesen Formation were collected from two sections, i.e., Minak and Niknamdeh respectively.
Systematic descriptions of the brachiopods were carried out at generic and specific levels, these are indicated in the text accordingly.
As a result of this investigation, during the Permian- Triassic times, Alborz shared a very similar paleogeographic realm with Shahreza-Abadeh Belt, as well as Jolfa region.
Many identical brachiopod genera and species of the three above- mentioned areas, as well as similar lithology, are indicative of their mutual sedimentay basin during Permian- Triassic times. Nevertheless, some marked differences may be observed during the latest Permian between the Alborz and the other two regions, i.e. the Dorashamian Stage is missing in the Alborz, whereas both in Jolfa and Shahreza-Abadeh areas are well- represented.
This gap, between the Permian- Triassic boundary beds, is marked by the development of a few metres of lateritic- bauxitic layers in the Alborz.
Subject List : Brachiopoda