Keywords : Nannobiostratigraphy


Nannobiostratigraphy of the Lower Part of Shiranish Formation, Sinjar Anticline, NW Iraq

Omar Ahmed Al-Badrani

Iraqi National Journal of Earth Sciences, 2012, Volume 12, Issue 1, Pages 1-16

Fifteen samples from the lower part of Shiranish Formation, Sinjar 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 nannolith. On the basis of the above assemblages two biozones are proposed from oldest (at bottom) to youngest
(at top):

2- Tranolithus phacelosus Interval Zone(Part) (CC23)
1- Lithraphidites praequadratus Partial Zone(Part) (CC22)

The above biozones are correlated with other calcareous nannofossils biozones from regional view led to conclude that the section is late Campanian in age.

Nannobiostratigraphy of Jaddala Formation in Well(KH 12/7) West Iraq

Omar A. Al-Badrani

Iraqi National Journal of Earth Sciences, 2011, Volume 11, Issue 1, Pages 71-84

ABSTRACT Thirteen species of Calcareous Nanofossils were identified from the Jaddala Formation from well (KH 12/7) of depth (107-130 m.) west Iraq. The recorded calcareous nannofossils assemblages permits the recognition of two biozones these are (from top to bottom):2- Discoaster saipanensis Interval zone(Part) (CP14b) 1- Discoaster bifax Interval zone(Part) (CP 14 a)On the basis of biocorrelation with previous works Middle Eocene (Bartonian) age confirmed for the Jaddala Formation at the studied section.