Calcareous Nannofossils Biostratigraphy of Tanjero Formation at Azmer anticline Northern Iraq

Rahme Fares Al-Sulevani,Omar Ahmed Al-Badrani

doi:10.24996/ijs.2021.62.5.23

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.

Highlights

Tanjero Formation is exposed in the high folded zone of Iraq
Tanjero Formation is composed of sandstone, claystone, and shale from the bottom, followed by a common vertical alternation of marls and limestone at the upper part of the studied section
Tanjero Formation is correlated with Shiranish Formation in northern Iraq [2, 3], but it is almost younger

Summary

Introduction

Tanjero Formation is exposed in the high folded zone of Iraq. It was first defined and described from Sirwan valley, 2 Km to the south of Kani Karweshkan village, near Halabja town, Sulimaniya, Northern Iraq [1], laying at Azmer anticline. Tanjero Formation is composed of sandstone, claystone, and shale from the bottom, followed by a common vertical alternation of marls and limestone at the upper part of the studied section. The lower part is deposited under deep marine shelf environments, while the upper part is deposited under open marine environments (Fig.). Tanjero Formation is correlated with Shiranish Formation in northern Iraq [2, 3], but it is almost younger.

Objectives

Methods