Keywords : Campanian

Ostracoda Assemblages of the Hartha Formation (Late Campanian - Early Maastrichtian) from Balad (8) well, Central Iraq

Muhanad Zuhair Hamid; Ibrahim Younis Al-Shareefi

Iraqi National Journal of Earth Science, 2022, Volume 22, Issue 1, Pages 15-37
DOI: 10.33899/earth.2022.174663

Fundamentally, the current study is concerned with the investigation and diagnosing of Ostracoda fossils from the subsurface section of the Hartha Formation (Late Campanian - Early Maastrichtian) from (Ba-8) well at central Iraq. Fifty-nine Ostracoda species belonging to (29) genera/ subgenera from (13) families are diagnosed and classified to their ranks according to the standard systematic paleontology. Whereat (57) species are attributed to species previously described from local and regional studies. Two species are left under open zoological nomenclature basically because of lack of specimens. As a result, the study inferred that the species diagnosed in the Hartha Formation belong to the Late Campanian - Early Maastricht. As These species are very similar in terms of the external appearance and geologic age to the same species that were compared with them and which were previously described in the regions of East, West, and North Africa as well as the Arabian Gulf region.

Biostratigraphy Study of Planktonic Foraminifera in Shiranish Formation and its Contact with Aaliji Formation in Pulkana Well No. 7 North Iraq

Abdullah Al-Hadidi; Mohamed Ahmed

Iraqi National Journal of Earth Science, 2019, Volume 19, Issue 2, Pages 41-59
DOI: 10.33899/earth.2019.170276

Planktonic Foraminifera is studied from Shiranish &Aaliji formations in PulkanaWell No. 7 North Iraq between the depth intervals (1948-2240) m, six biostratigraphy zones are recognized in the formation as arranged from bottom to top:
1. Globotruncanita stuarti–stuartiformis Partial Range Zone.
2. Globotruncana aegyptiaca Interval Zone.
3. Gansserina gansseri Total Rang Zone.
4. Morozovella angulata  Partial Range Zone.
5. Globanomalina  pseudomenardii  Total Rang Zone .
6. Morozovella velascoensis Partial Range Zone.
The result of this study is compared with the work of others inside and outside Iraq, The age of the Shiranish Formation is Early Late Campanian to Earliest Maastrichtian whereas Aaliji Formation is Late Paleocene.