This paper discusses the biostratigraphy and palaeoecology of calcareous nannofossils of the uppermost Mozduran Formation in the Jozak section in west Kopet-Dagh basin. The Mozduran Formation consists of white to grey Limestone . In the studied sections , samples are taken and prepared with smear slides. In the Jozak section , 17 species have been determined. Based on nannoplanktons and as a result of biostratigraphy studies, the nannofossil standard zones (CC4) are identified. According to this zone , the age of the studied thickness is Early Hauterivian in this section in west Kopet - Dagh basin. The presence of warm water indicators ( Nannoconus , Watznaueria , Lithraphidites ) suggests warm surface water conditions in the studied thickness . In the Jozak section based on Nannoconus spp. , low fertility conditions are suggested . The studied area is deposited in low to middle latitudes and shallow marine environments.
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