Biostratigraphy of the Late Cretaceous-Early Paleocene Succession in Selected Wells, Jambur Oil field, Kirkuk, Northern Iraq

The Late Cretaceous-Early Paleocene Shiranish and Aliji formations have been studied in three selected wells Jambur Oil Field (Ja-50, Ja-53, Ja-67) Kirkuk, Northeastern Iraq. This study included lithostratigraphy biostratigraphy. Campanian-Maastrichtian Formation consist mainly of thin marly chalky limestone beds overlain by marl beds, with some representing an outer shelf basinal environment, the unconformable contact above Middle Paleocene-Early Eocene contain layers which represents environment. Five Biozones were determined are: 1.Globotruncanita calcarata Range Zone (part). 2.Globotruncanella havanensis Partial Zone. 3.Globotruncana aegyptiaca Interval 4.Gansserina gansseri (Part). 5.Abathomphalus mayaroensis While there two biozones 1.Guembelitria Cretacea Partial-Range 2.Parvularugoglobigerina eugubina Total-Range