Abstract
The occurrence of the Danian Stage at Kurdistan Region of Iraq, particularly in the high folded zone, was a debatable subject by many authors. Most of the previous studies believe that it is poorly preserved. This study reviews the Danian sequence at Per Fat of Duhok area using high resolution biostratigraphic analysis of the planktic foraminifera. The Danian stage sequence in the studied locality is represented by the marlstone, shale, and marly limestone rock types of the Aaliji Formation. Occasional iron oxides and microscopic glauconites intervals are characteristics. The thickness of the Danian sequence is about 29.71 m. The sequence is underlined by the Upper Cretaceous Shiranish Formation, and overlies by the green-olive clastic sediments of the Paleocene Kolosh Formation. Biostratigraphic zonation of the identified foraminiferal assemblages shows the occurrence of the four Danian Planktic foraminiferal biozones and three subzones including Guembelitria cretacea partial-range zone (P0); Parvularugoglobigerina eugubina total range zone (Pα); Parasubbotina pseudobulloides partial-range zone (P1); Globanomalina archaeocompressa partial-range subzone (P1a), Subbotina triloculinoides interval subzone (P1b), Globanomalina compressa-Praemurica inconstans interval subzone (P1c); and Praemurica uncinata interval zone (P2). This indicates a complete sequence of the Danian stage is preserved in the Per Fat section of Duhok area.
Highlights
The Danian is the oldest stage of the Paleocene Epoch
The current study aims to approve the occurrences of the Danian stage of the Aaliji Formation at Duhok area throughout the investigation
Lithostratigraphy In the current study, the obvious color change, thin yellow-red laminar, and the sedimented bitumen beads were good physical indicators to determine the base of the Danian of the Aaliji Formation in
Summary
The Danian is the oldest stage of the Paleocene Epoch. It engrosses about 4.4 m.y. begins before 66 m.y. ago, and ends at the begging of Selandian Age before 61.6 m.y. ago. (Al-Omari, 1970) through his study for the Mesozoic/Cenozoic boundary in three oil wells: Butmah-9, Ain Zalah -16 and 17 at northwestern Iraq confirmed that the Aaliji Formation yielded typical world-wide recognized foraminifera of Danian Age. The existence of Danian stage as represented by the Aaliji Formation in the high folded zone of northeast Iraq was a controversial subject even between basic geological literature on Iraq such as Bellen et al (1959); Buday (1980) and Jassim and Goff (2006). Previous studies regarding the existence of the Danian Stage in Iraq implemented by the geological survey of Iraq teams mainly in the Western Desert of Iraq, including Al-Mutter (1976); Karim (1977); Al-Mubarak and Amin (1983); Al-Bassam (1987) and Al-Bassam et al (1990)
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