Late Cretaceous Calcareous Nannofossil Biostratigraphy Of Akecheyi Section, Western Tarim Basin, China

Late Cretaceous Kukebai Formation contains numerous Calcareous Nanofossils in Akecheyi section,Western Tarim Basin,Xingjing province and studied extensively in past by many researchers.Kukebai formation contains 10 genus and 11 species of calcareous Nanofossils : include Radiolithus planus,Quadrum gartneri,,Braarudosphaera bigelowii,Watznaueria manivitiae,Watznaueria barnesae,Helenea chiastia,Haqius circumradiatus,Tranolithus gabalus,Eprolithus floralis,Eiffellithus eximius,Gartnerago segmentatum?.The present study concludes the two Calcareous Nanofossils combination belt in accordance with international standards which are;Radiolithus planus-Helenea chiastia and Eprolithus floralis-Quadrum gartneri.By comparing this datum with other region's datum,Geological age of Kukebai Formation of Akecheyi section should be early Cenomanian-mid Campanian.A large number of the off shore environmental element : Braarudosphaera bigelowii,Watznaueria manivitiae,Watznaueria barnesae,Eprolithus floralis,Quadrum gartneri appear also indicates the study of the regional calcareous nannofossils ecological characteristics mainly for the off shore environment.