Keywords : Paleoecology

Paleoenvironmental Study of Khurmala Formation by Ostracoda in Shaqlawa and Dohuk area, Northern Iraq

Mahfoudh Al-Hadeedy; Saleh Khalaf

Iraqi National Journal of Earth Science, 2020, Volume 20, Issue 2, Pages 148-164
DOI: 10.33899/earth.2020.170375

   A detail paleoenvironmental study of ostracods fauna to investigated the paleoenvironment of Khurmala Formation for two section Northern Iraq; the first (Hjran section) lies near Shaqlawa city, and the second (Dohuk section) lies near Dohuk city. Based on ostracods study conclude that Khurmala Formation were deposited in shelf environment, about (30 – 200) meter in depth.

Paleoecology and Statistical Study of Ostracoda, Fat'ha Formation (Middle Miocene) from Bazian Anticline, Al- Sulaymaniyah Area, Kurdistan Region, Iraq

Zahida Al-Hadithi; Nisreen Aziz

Iraqi National Journal of Earth Science, 2019, Volume 19, Issue 2, Pages 119-135
DOI: 10.33899/earth.2019.170284

Ostracoda assemblages have been studied from Fat'ha Formation (Middle Miocene) at SW limb of Bazian anticline, Sulaymaniyah,Kurdistan region, Iraq.  The Paleoecology of ostracoda assemblages points to shallow marine water that changes to barrier lagoon water setting due to tectonic activity event. The application of statistical analysis (Simpson index) leads to the subdivisions of Fat'ha Formation into five ecozones in the studied area.

Biostratigraphy by Calcareous Nannofossils and Paleoecology by Ostracoda of Tanuma Formation, Central Iraq

Omar A. Al-Badrani; Sanad A. Al-Khashab

Iraqi National Journal of Earth Science, 2013, Volume 13, Issue 2, Pages 33-46
DOI: 10.33899/earth.2013.79659

Forty three samples of limestone and shales from Tanuma Formation obtained from East Baghdad well (No. 11) at depths (2067 - 2177 m.) about 110 m. in thickness. Details investigated carried out identify twenty species of calcareous nannofossils, sixteen described from other region and four left open name because of rare and not clear samples. Furthermore, twenty four species of ostracodes belonging to fourteen genera were recorded, these are: Bairdia, Brachycythere, Curfsina, Cythereis, Cytherella, Cytherelloidea, Dolocytheridea, Ovocytheridea, Paracypris, Protocythere, Pterygocythere, Schuleridea, Spinoleberis, Veenia.
The recorded calcareous nannofossils assemblages permits to recognized two biozones these are:

2- Micula cf. decussata Interval Biozone (CC14).

1- Marthasterites furcatus Interval Biozone (CC13).
On the basis of biocorrelation with previous works Coniacian age confirmed for the Tanuma Formation at the studied section. The analysis of the ostracode fauna led to conclude that the palaeoecology of the Tanuma Formation in this section is shallow marine environment at depth about 200m in the neritic zone with warm water, under normal marine water salinity.

Paleoecology of Garagu Formation and the Upper Part of Ratawi Formation (Lower Cretaceous) of Central Iraq

Jinan M. Al-Basher; Sanad A. Al-Khashab; Salih K. Khalaf

Iraqi National Journal of Earth Science, 2011, Volume 11, Issue 1, Pages 1-14
DOI: 10.33899/earth.2011.5498

Ostracode assemblages from Garagu and Ratawi Formations (Lower Cretaceous) from Makhul-2 (Mk-2) and East Baghdad-1 (EB-1) boreholes were studied in details, leading to the conclusion that Garagu Formation deposited under shallow marine sublittoral environment with normal salinity and warm water, while Ratawi Formation deposited in shallow marine environment with anoxic environments.

Palynostratigraphy and Paleoecology of the Upper Part of Akkas Formation in Borehole KH5/1in the Western Iraqi Desert

Noha D. Al-Sawaf; Amer D. Nader

Iraqi National Journal of Earth Science, 2008, Volume 8, Issue 2, Pages 64-81
DOI: 10.33899/earth.2008.5476

Fourteen sample from the stratigraphic interval (1330-1600m.) in the borehole KH5/1 were studied palynoogically. The samples yielded well preserved and diversified palynomorphs except one sample at depth (1330m.) was barren.
Identification of (54) species of acritarchs belong to (29) genera and (16) species of Chitinozoans belong to (9) genera, (16) species of miospores belong to (13) genera and (6) species of Scolecodont belong to (4) genera was the conclusion of this study.
Comparision with similar palynomorphs in different parts of the worlds indicates clearly Upper Silurian (Ludlow) age for the samples studied. The Palynomorphs and especially the acritarchs reveal that the studied section was deposited in near