Sequence Stratigraphy and Sedimentary Environment of the Shiranish Formation, Duhok region, Northern Iraq

The Shiranish Formation is cropped out in several areas northern Iraq. A stratigraphic and facies study was conducted within the Duhok region to determine sedimentary environment. Three microfacies, reflecting various subenvironments different shelf parts of deep sea, have been identified Formation. Four depositional environments are identified: slope, toe shelf, deep-sea or cratonic basin. region, Northern Iraq, deposited an open carbonate platform. sequence divided into six third-order cycles area. These asymmetrical reflect imbalance between relative level sea production carbonate, each one reflects a rise following period standstill. There two-sequence boundary type SB-2 that defines surface. developed high-subsidence area played main role evolution formation. It on platform with high subsidence due major transgression, wherever successive sea-level stillstand episodes persist.