Upper cretaceous and lower cenozoic foraminifera of three oil wells in northwestern Iraq

"Seventy-five samples of well cuttings and cores from the Iraq Petroleum Company Butmah Well No. 9, Ain Zalah Well No. 16 and Ain Zalah Well No. 17, in northwestern Iraq at approximately 36° 37' north latitude and 42° 41' east longitude, have been examined in detail. The lithologic descriptive term "marl" is replaced by calcareous shale or argillaceous limestone, and the term "globigerinal limestone" is not considered applicable. The foraminiferal fauna from the upper part of the Shiranish Formation prove to be of Maestrichtian age. The Mesozoic-Cenozoic boundary is recognized on the basis of "smaller foraminiferal" faunal assemblages; it is placed between the Maestrichtian and the Danian Stages. The Aaliji Formation yielded typical world-wide recognized Danian fossils at the bottom and Landenian forms in the upper part. The Danian Stage is established for the first time in Ain Zalah Well No. 17 and here is considered to be at the base of the Cenozoic Erathem. The Landenian State is introduced for the first time in the stratigraphic column of Iraq. Strata of Maestrichtian, Danian, and Landenian age yielded a foraminiferal fauna of 167 species and subspecies, belonging to 53 genera, 26 families, 8 superfamilies and two suborders. Of the genera present Globotruncana, Praebulimina, Bolivina, and Heterohelix have the greatest number of species and individuals in the Upper Cretaceous samples, and Globigerina and Globorotalia dominate the Paleocene (Danian and Landenian) fauna. The genera Chiloguernbelina, Rugoglobigerina, Pseudonodosaria and Globigerina are included in the taxonomic study, and the earliest representatives of the last genus are considered to be Danian in age"--Abstract, pages ii-iii.

Name thesis:degree_name

Ph. D. in Geology

Grantor

University of Missouri--Rolla

Year dc:date.available

2016

Author dc:creator

• Al-Omari, Farouk Sunallah

• Geology

Repository record dc:identifier

https://scholarsmine.mst.edu/doctoral_dissertations/2077

OAI identifier oai:identifier

oai:scholarsmine.mst.edu:doctoral_dissertations-3079