Keywords : Upper Cretaceous

New Species of Ostracoda Genus Cytherella Jones, 1849 from the Upper Cretaceous of Hamrin Area North Eastern Iraq

Saleh K. Khalaf; Waleed Y. AL - Ubide

Iraqi National Journal of Earth Science, 2010, Volume 10, Issue 2, Pages 25-34
DOI: 10.33899/earth.2010.5518

ABSTRACT Four new ostracod species belonging to the genus Cytherella Jones, 1849 described from the Upper Cretaceous succession of Hamrin area NE Iraq namely: Cytherella shiranishensis sp. nov; ; C. iraqiensis sp. nov.: C. mushoriensis sp. nov.; and C. kirkukiensis sp. nov. Keywords: Ostracoda; Cytherella; Cretaceous; Iraq.

Paleoecology of some Upper Cretaceous Formations from Selected Wells Northwest and Middle Iraq

Ibrahim Al-Shareefi; Saleh K. Khalaf; Marwan A. Al-Eisa

Iraqi National Journal of Earth Science, 2010, Volume 10, Issue 2, Pages 67-96
DOI: 10.33899/earth.2010.5523

On the basis of the biocontents, lithological features and analysis of the microfacies, an attempt is made to establish the nature of paleoecology and depositional environments of some Upper Cretaceous formations from northwest and middle Iraq ,of which the successions are represented by the formations from the oldest to the youngest are Khasib, Tanuma, Sa'di, Mushorah, Hartha and Shiranish.A wide spectrum of environmental types distributed between deep and shallow marine environments. The implication of paleoecological interpretations for different Ostrscode species and other fossils recorded in the studied sections highlights the strong correlation between the environmental parameters in particular the depths and the lifestyle of these organisms including specific morphologies and faunal abundance.In addition to that from palaeocological point view the identified biocontents represent a southern shelf tythes fauna.

Stratigraphy of the Dokan Formation (Upper Cretaceous) JebelAzmer- Sulaimaniya Area, Northeastern Iraq

Rund A. Hammoudi; Tarik S. Abawi

Iraqi National Journal of Earth Science, 2010, Volume 10, Issue 1, Pages 1-10
DOI: 10.33899/earth.2010.5562

ABSTRACT Contrary to the present opinion regarding the Balambo Formation exposed in Jebel Azmer, Sulaimaniya area, northeastern Iraq, this study shows that the upper part (63 m) of the Balambo succession actually belongs to the Dokan Formation. The major hiatus between the lower part of the succession which represents the Balambo Formation and the upper part of the succession which we claim to represent the Dokan Formation together with the lithological differences give strong reason to characterize the studied section as the Dokan Formation. Dokan Formation in the studied section consists of light brown and white massive not well bedded limestone. Nineteen planktonic foraminiferal species have been identified from this section. The age of the Dokan Formation in the Jebel Azmer area is Middle - Late Cenomanian and is assigned to Rotalipora cushmani Zone; this indicates a major hiatus between the Dokan Formation and the older Balambo Formation of Middle-Late Albian age in this area.

Stratigraphy of the Gulneri Formation (Upper Cretaceous) in the Type Section, Dokan Area, Northeastern Iraq

araz; Tarik S. Abawi Ru hammoudi

Iraqi National Journal of Earth Science, 2006, Volume 6, Issue 2, Pages 33-42
DOI: 10.33899/earth.2006.36394

Eight planktonic and six benthonic foraminiferal species were recorded from the type section of the Gulneri Formation at the site of Dokan Dam, Dokan area, northeastern Iraq. The sediments of the Gulneri Formation consist basically of organic–carbon rich black shale and represent a record of the ocean anoxic event 2 (OAE2) across the Cenomanian–Turonian boundary. The planktonic foraminiferal assemblages of the Gulneri Formation indicates an Early Turonian age for the formation .