Microfacies Evidences for Eocene Sequence Stratigraphy of Jaddala/Avanah Formations, Sinjar Area, Northwest Iraq

Abstract

Surface section of the Jaddala-Avanah Formations (Lower-Middle Eocene) is studied in Sinjar area. Three microfacies were recognized throughout Jaddala Formation, their depositional environment represented outer shelf-middle bathyal zones, likewise three microfacies were recognized within Avanah Formation representing environmental stretch from inner-middle shelf zones. Seven sequences were distinguished in the studied section, six sequences of 4th to 5th order and one of 3rd order. According to sequence stratigraphic analysis the south limb of Sinjar anticline formed part of shelfal deposit of the Eocene Sinjar basin; with repetitive shallowing cycles.