Oligocene and Miocene Rock Beds in Mamlaha anticline, Chamchamal town, Sulaimani city- Kurdistan region/ Iraq

1 Soran O. A. Kharajiany, 2 Fouad M. Qader, 3 Salim H. Hakkari , 4 Hero G. Sharbazheri
School of Art- Ceramic Materials, University of Sulaimani, 2 School of Science- Geology, University of Sulaimani, 
School of Science- Geology, University of Sulaimani, 4 School of Science- Geology, University of Sulaimani

Previously, the Oligocene rock beds in the Mamlaha anticline have neither mentioned nor
proved. There are some selected sections that detected during field surveys but did not verified
weather belong to Oligocene- Miocene ages or not. Through this research, it is proved that they are
composed of Oligocene and Miocene rock strata. They are well-known as excellent rock reservoirs
for hydrocarbon accumulation in Kurdistan region and Iraq as a whole.
Field survey and stratigraphic study with microfacies analysis showed that nearly 37 meter of the
rock units from Mamlaha anticline (Mamlaha, Khwelin and Pungala sections) are representing
these formations; Bajwan Formation (Middle Oligocene), Anah and Ibrahim formations (Late
Oligocene) ages, Serikagni, Euphrates and Dhiban formations (Early Miocene) and Jeribe
Formation (Middle Miocene) ages respectively.
The contact between Bajwan and Anah is unconformable; the Lower contact of Bajwan Formation
is not exposed in each of the section. Ibrahim Formation however not exposed as well beds of marly
limestone; it shows as pocket of marly limestone, but it sandwiched between Bajwan and Anah
formations and shows no clear boundary.
The upper contact of Anah Formation is separated from Euphrates Formation by 2 meters of green
marl which indicates abrupt change in the lithology. The upper contact of Euphrates shows
unconformity, while Dhiban Formation is unconformably underneath the marly sandy bituminous
limestone of Jeribe Formation; Jeribe Formation is also unconformably lies beneath the claystone of
Fatha Formation.

Keywords: Archias kirkukensis, Austrotrilina howchini,, Mamlaha, Oligocene- Miocene, Kirkuk
Group Formations, Chamchamal, Kurdistan Region.


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