Nannobiostratigraphy of the lower part of shiranish formation, sinjar anticline, nw Iraq

الملخص EN

Fifteen samples from the lower part of Shiranish Formation, Sin jar anticline, northwest Iraq, are investigated in order to identify calcareous nannofossils species of which twelve species are recorded as follow; one species of holococcoliths, seven are heterococcoliths and four are monolith.

On the basis of the above assemblages two bio zones are proposed from oldest (at bottom) to youngest (at top) : 1- Granoliths phacelosus Interval Zone (Part) (CC23).

2- Lithraphidites praequadratus Partial Zone (Part) (CC22) The above bio zones are correlated with other calcareous nannofossils bio zones from regional view led to conclude that the section is late Companion in age.