Abstract
In this research, calcareous nannofossils of the Upper Cretaceous deposits of the souteast Lar have been investigated. The Upper Cretaceous deposits have a thickness of 173 meters and consist of thick layers of marl and marly limestone. For introducing calcareous nannofossil assemblages and biozones, 141 slides of the Gurpi Formation in southeast of Lar area have been studies which led to identification of seven biozones. As a result of this study, 21 genera and 39 species of calcareous nannofossils were identified. Based on identification of these biozones, the age of the Gurpi Formation is late Early Campanian to Late Maastrichtian in the studied section, that corresponding to Calculites ovalis Zone (CC19) to Arkhangelskiella cymbiformis Zone (CC25).
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