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Diagenesis and geochemistry of three selected and well exposed outcrops of Qamchuqa Formation (Early Cretaceous) at Kurdistan Region northeastern Iraq were examined. Lithologically this formation is mainly composed of dolomite, and limestone beds. Petrographic study of the Qamchuqa Formation reveals that the skeletal and some non- skeletal grains within the limestone a nd dolomitic limestone beds are the main components of this formation. Micritizati on, cementation, neom orphism, compaction, dissolution and dolom...