بررسي مرز پرمين - ترياس در برش اسفه شمال خاور شهرضا (ايران مركزي)

The Study of Permian-Triassic Boundary in Esfeh Section N.E. Shahreza (Central Iran)

The stratigraphic section of Esfeh is located at 15 km north-east of Shahreza and 65 km south of Esfahan. The aim of this study is to consider the lithostratigraphy, biostratigraphy and how to settle the Permian-Triassic boundary, also the geochronology of them. The biostratigraphic study of this section indicates the existence of index Fusulinidae with the high quality of other places, for instanceʹNerbeekina verbeeki, Sumatrina annae , Afghanella schenki, Yangchienia iniqua , Eoparafusulina Shengi. In this study the geochronological change of member 3 of the Surmagh Formation with attention to index fossils attributed from Guadalupian to Early Julfian and also the lithoiogical alterations to exist in deposits of the Hambast Formation equivalent to Esfeh section, the Shahreza formation propose is necessary.