Calcareous Nannofossils Biostratigraphy of Tanjero Formation at Azmer anticline Northern Iraq

Abstract

Seventy three species of calcareous nannofossils are recorded from the studied section of Tanjero Formation at Azmer anticline, Sulimaniya, Northern Iraq. The studied section reveals four biozones arranged in an ascending order from oldest to youngest as follows; Tranolithus phacelosus Interval Biozone (CC23) Part, Rienhardtites lives Interval Biozone (CC24), Arkhangelskilla cymbiformis Interval Biozone (CC25), and Nephrolithus frequens Rang Biozone (CC26) Part. These biozones are correlated with other calcareous nannofossil biozones of both local and regional sections, leading to conclude a possible age of Late Campanian- Maastrichtian.

Calcareous Nannofossils from the Shiranish Formation at Bekhaer anticline, Dhouk area, Northern Iraq

“…Within the middle part of the studied section of the Shiranish Formation Correlation: This zone is compared with CC24 (Reinhardtites levis) zone that studied by the [33] which is indicating an age extends from the late Campanian to early Maastrichtian, and compared with the UC18 zone that is studied by [40] that aged Maastrichtian age; and compared with Reinhardtites levis zone that studied by the [22,65,66], that aged of the early Maastrichtian. Its alo recoreded by [68] from the lower part of Tanjero Formation in sulaimnai area. Based on this correlation, this interval biozone assigned to be as early Maastrichtian in age [69].…”

“…On local scale its compared with Tranolithus phacelosus zone that is recorded by the [22,65,66,67], that is also extends un age from Campanian to early Maastrichtian. Its also recorded as index of zone CC23 from the lower part of the Tanjero Formation, Sulaimani area by [68]. Accordingly, the suggested age for this zone extends late Campanian to early Maastrichtian based on geological time scale by [69].…”

Calcareous nannofossils biostratigraphy and Paleoclimatology of the Bekhme Formation, Bekhere anticline, Dhouk area, Kurdistan region, Northern Iraq

“…The thickness of this biozone is 40 meter from the section. This biozone is correlated with CC22 (Quadrum trifidum biozone), which is studied by [10 ] and aged as the middle to late Campanian, and correlated upper part of UC15 biozone that is studied by [11 ] which aged middle to late Campanian age, and correlated with CC22 is studied by [13 ] aged late Campanian age, and correlated with CC22 is studied by [14] aged late Campanian age, and correlated with CC22 is studied by [15] aged late Campanian age, and correlated with CC22 which is studied by [4] and aged as the late Campanian age, Therefore we suggest the late Campanian [12] (Figs. 7,8).…”

“…In some cases, the Bekhme Formation biozones were correlated with the Shiranish and Tanjero Formations in northern Iraq. [3], [4]. Many previous studies investigated the Bekhme Formation in Dohuk area ; [5], who recorded Four biozone of planktonic foraminifera through a biostratigraphic study of the Bekhme Formation of the section at the Southern limb of Bekhair anticline and determines the age of formation as the Late Campanian.…”