الملخص

Planktonic foraminifera is studied from Shiranish Formation in Makhmur well No. (1), North Iraq between the depth interval (657-620) m. Three biostratigraphy Zones are recognized in these formation: 1. Globotruncanita elevata–Rosita fornicata Zone. 2. Globotruncana aegyptiaca Zone. 3. Gansserina gansseri Zone. 20 عبد الله سلطان شهاب الحدیدی The results of this study are compared with the work of others inside and outside Iraq. The age of the Shiranish Formation in the said well is Late Companian to Early Maastrichtian.