Gastropods of Aptian- Cenomanian of Qamchuqa Formation from Northern Iraq

Salam Ismail Al-Dulaimy

doi:10.24996/ijs.2020.61.12.18

Abstract

Gastropod species belonging to Qamchuqa Formation (Aptian-Cenomanian) in the North of Iraq are studied. These species are Harpagodes nodosus (J.de C. Sowerby,1823), Ampullina sp.1 (Hannaa and Furisch, 2011), Ampullina sp.2 (Hannaa and Furisch, 2011), Tylostoma pallaryi (Peron and Fourtau, 1904), Calliomphalus orientalis (Douville,1916), and Pyrgulifera (Meek, 1871). They are recorded in the Upper Cretaceous succession of Northern Iraq for the first time. Most of these species are internal moulds and not abundant at any stratigraphic level but irregularly scattered in the formation.

Highlights

The Qamchuqa Formation includes shallow water carbonate succession with broad distribution in north and northeast of Iraq, where it outcrops in the high folded zone and in the subsurface of the foothill zone
The aim of the present study is to describe and identify the gastropod fossil content of Qamchuqa Formation in northern Iraq
Seventy Gastropod specimens were collected from the Qamchuqa Formation at Sulaimaniya Governorate, northeast Iraq (Figure- 1)

Summary

Introduction

The Qamchuqa Formation includes shallow water carbonate succession with broad distribution in north and northeast of Iraq, where it outcrops in the high folded zone and in the subsurface of the foothill zone. Seventy Gastropod specimens were collected from the Qamchuqa Formation at Sulaimaniya Governorate, northeast Iraq (Figure- 1). Qamchuqa Formation consists of limestone and dolomite units, without clastic beds, that separate the formation into two parts (Figure- 3). Material and occurrence: Three internal moulds from the upper part of Qamchchuqa Formation at Yaghsamer and Zewe sections, Northern Iraq. The current material consists of internal moulds, the subovate aperture, relatively low spire, and moderately broad umbilicus indicate that the specimens belong to the genus. Material: Two internal moulds from the Lower Aption-Lower Cenomanian Qamchuqa Formation, at Yaghsamer and Zewe sections, northern Iraq. The base is broadly rounded and has an oval and small aperture with highly convex outer lip and slightly concave inner lip.

Discussion

Findings

Conclusions