1 M.Sc., Department of Geology, Faculty of Sciences, University of Birjand, Birjand, Iran

2 Assistant Professor, Faculty of Geology, Collage of Science, University of Tehran, Tehran, Iran

3 Assistant Professor, Department of Geology, Faculty of Sciences, University of Birjand, Birjand, Iran

4 Professor, Department of Geology, Faculty of Sciences, University of Birjand, Birjand, Iran


Calcareous nannofossils of Nimbolook section in north west of Qayen, east of Iran have been investigated. The section is 164 m thick and consists of limestone, marlstone and shale. Seventy six nannofossil species belong to thirty genera from fifteen families were identified. Based on the identified calcareous nannofossils, a part of subzone CC7b and biozone CC8 and a part of biozone CC9 of Sissingh biozonation (1977) and a part of subzone NC7 and biozones NC8, NC9 and a part of biozone NC10 of Roth biozonation (1978) have been suggested for the Nimbolook section. Therefore, an age of late Aptian–Albian and early Cenomanian? is assigned to the deposits of this section.


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