Calcareous Nannofossils in Holocene Surface Sediments of the Persian Gulf

The effect of the paleoclimatic and paleoenvironmental changes on the structure of the bioticcommunities are stronger and better recorded in the shelf area than in the open sea. The present study isdevoted to impact of climatic events on some species of calcareous nannofossils. For this reason, 17samples of surface sediments of the Persian Gulf were studied. Preservation of calcareous nannofossils insurface sediment samples was good and the dominant species were huxleyi, Helicosphaera carteri Holocene sediments in the study area were deposited in the warm water and the Persian Gulf was ashallow and hyposaline basin in which productivity of calcareous nannofossils was high.Gephyrocapsa oceanica, Emilianiaand Calcidiscus leptoporus. The presence of these taxa indicated the