The Garagu Formation is mostly composed of a carbonate beds with iron-rich horizons in the middle part. In this study the geochemical evidences for paleodepositional environment of the Garagu Formation in Gara anticline, Kurdistan Region, Iraq have been discussed. A total of 9 samples from Garagu Formation analyzed by XRF for major elements, ICP-MS for trace elements, including rare earth elements. From geochemical data of major and trace elements, including rare earth elements, a series of identification indexes, such as: Sr/Ba, Rb/ K2O, Th/U, U/Th, V/ (V+Ni), δU, V/Sc, Sr/Cu, and C-Value ratios, were calculated which can be used to indicate, paleosalinity, ancient oxidizing environment, and paleoclimate conditions. CaO has the highest weight percentages in all samples, as expected in this limestone-dominated formation. The FeO shows high percentages in several samples from the iron rich mineralization within the middle part of the formation. The elemental geochemical ratios indicate to saline shallow marine environment with lower salinity in the middle part of the formation. The paleoredox proxies revealed that the oxic to suboxic conditions were prevailed during the deposition of the formation.
