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The main purpose of this study is to investigate the depositional setting of the Nari Formation (Oligocene) Kirthar Province, along with NS trending Laki Range, Southern Indus Basin, Pakistan where tertiary rocks are well exposed. Grain size analysis of twelve representative samples of sandstone of Nari Formation(Oligocene) has been carried out. These results specify very fine to fine grain sedimentsand unimodal nature of grain size distribution. The results are also indicated that sediments are fine skewed and generally nearly symmetrical in nature and leptokurtic, mesokurtic and platykurtic in nature. Linear discriminant function mostly confirms low energy (shallow marine) settings. The most of the interpretation diagramindicates that the samples are clustered, that may beowing to the combination of two modes either in identicalamount in bimodal or good sorting in unimodal sediments. Coarse one percentile to Median interpretation diagram for Oligocene Nari Formation sandstone implies that sediments were deposited in beach depositional settings as bed load and suspended load mode of transportation.