Calcareous Nannofossils Biostratigraphy of Shiranish Formation (K-306) well, Northern Iraq

Abstract

Twenty Samples of Shiranish Formation from the well (K-306), Kirkuk area, northern Iraq, are collected and studied on the basis of stratigraphic ranges of the recorded calcareous nannofossils. Eighty-nine species in the studied section reveals five biozones arranged from oldest to youngest as follows: 1.Quadrum trifidum Interval Biozone (CC22) Part 2.Tranolithus phacelosus Interval Biozone (CC23) 3.Rienhardtites lives Interval Biozone (CC24) 4. Arkhangelskilla cymbiformis Interval Biozone (CC25) 5. Nephrolithus frequens Rang Biozone (CC26) PartThese Biozones are correlated with other calcareous nannofossils biozones, from both local and regional sections, leading to conclude the age of Campanian-Maastrichtian.

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

“…The thickness of this biozone IS about (25 meters) and recorded from the upper part of Shiranish formation in the studied section Correlation:This biozone is compared with (CC25) (Arkhangelskiella cymbiformis) zone by [33] , which is subdivided into three subzones namely (CC25a, CC25b, CC25c), that is based on the the first appearance of the species Arkhangelskiella cymbiformis and the first appearance of species Lithraphidites quadratus at Maastrichtian age, and compared with the UC19 zone that is studied by [40] that aged Late Maastrichtian age. IN Kurdistan region this zone also compared with Arkhangelskiella cymbiformis zone by the [65] which is assigned to be Maastrichtian in age ; therefore we suggested the Maastrichtian [69]. Its worthy to mention neither late Maastrichtian (CC26) nor Danian calcareous nannofossils (CP.1) biozones are recognized in the studied section of Beakher anticline, Dhouk area, Kurdistan region, (N. Iraq)…”

“…7 and 8), These biozones are : 1 -Tranolithus phacelosus [35] Interval Biozone (CC 23) Identification: It is Interval biozone for Tranolithus phacelosus [35], recorded by the Last Appearance Datum (LAD) of the species Eiffilithus eximus Reinhardt (1965), and extends to the Last Appearance Datum (LAD) of the species Tranolithus phacelosus [35], and the thickness of this biozone is about (18 meters), within the lower part of the Shiranish Formation Correlation: This zone is compared with CC23 (Tranolithus phacelosus) zone which studied by the [33] that aged of the late Campanian to early Maastrichtian, and compared with UC16, UC17 zone that is studied by [40], that aged Campanian to early Maastrichtian age. 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].…”

“…The thickness of this biozone is about (12 meters). 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.…”

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).…”