البينة القديمة للأوستراكودا في تكوين الفتحة (المايوسين الأوسط)‎، منطقة حمام العليل، شمالي العراق

Abstract EN

To assess the paleoecology of the Ostracoda and their significance as paleoenvironmental indicators in the Fatha Formation (Middle Miocene), eighteen samples are collected in this study from one section located in the Hammam Al-Alil area, northern Iraq.

Thirty Ostracoda Species belonging to (16) genera are described, of which (14) species are previously described from Iraq and other regions; twelve species most probably represent new forms, whereas the rest (4) species are left for open nomenclature due to the lack of material.

Based on the habitat of the investigated Ostracoda species and their paleoecological significance, in terms of depth, salinity, temperature, oxygen and substratum, it is suggested that the sampled part of the Fatha Formation sequence was deposited in a semi-closed shallow basin under high, brackish to normal salinity and normal oxygen concentration, with some indications of oxic environment, suggested by the occasional change of the shells color.

Based on the results of the present study, the Fatha Formation in the studied section can be divided into two Ostracoda Assemblage Biozones.

The first is Cytherelloidea sp.1 Assemblages Biozone, and the second is Dentokrithe indica Assemblages Biozone