Document Type : Original Research Paper

Authors

1 Assistant Professor, Faculty of Science, Birjand Unversity, Birjand, Iran

2 Associate Professor, Department of Geology, Earth Science Faculty, Shahid Beheshti University, Tehran, Iran.

3 Professor, Department of Geology, Science Faculty, Esfehan University, Esfehan, Iran.

4 Professor, Department of Geology, Science Faculty, Ferdowsi University of Mashhad, Mashhad, Iran.

Abstract

A stratigraphic section in west of Maraveh Tappeh town has been selected and measured in order to study the Aitamir Formation in north west of Kopeh Dagh. The Aitamir Formation with 1070 m thickness, consists of sandstone in the lower part and shale and marl in the upper part. The lower and upper boundaries of the Aitamir Formation with Sanganeh and Abdraz Formations are conformable. The biostratigraphic studies led to identification of 34 genera and 58 species of planktonic and benthonic foraminifera. Based on foraminifera assemblage three biozones are suggested as follows: Rotalipora appenninica zone, Rotalipora brotzeni zone, Whiteinella aumalensis –Dicarinella canaliculata zone. These biozones coincidence with global biozones. Based on foraminiferal fauna, a Late Albian to Late Cenomanian age is suggested for the upper shale member of Aitamir Formation.
 

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