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The present study indicates a Comprehensive analysis of the particle size of 21 specimens of sandstone of the Siwalik Group (Manchar Formation) from southwest of LalBagh, Sehwan. The parameters of the particle size indicate that almost all of the Siwalik Group (Manchar Formation) unconsolidated sediments are mostly fine to medium grained, poorly to moderately sorted, and mostly coarse skewed to fine skewed and leptokurtic, to platykurtic in nature. This study's main goal is to assess the depositional setting of the Siwalik Group (Manchar Formation) The discriminated analysis reveal that most of specimens are clustered, This is probably a combination of two types of bimodal sediments of equivalent magnitude or well sorting of unimodal sediments. The amples from Manchar formation, the linear discriminant function analysis indicates mostly rivers under the impact of marine settings. The delta-dominated deposition environment with the impact of fluvial deposits is supported by interpretation diagrams.