Sedimentologists study the constituents, surfaces, structures, and fossil substance of the stores set down in various geographic situations. By these methods they can separate between mainland, littoral, and marine stores of the geologic record. The three fundamental kinds of sedimentary rocks are clastic, substance, and natural sedimentary rocks. Sedimentary geography is a part of topography worried about the investigation of sedimentary rocks. The primary objective of sedimentary topography is to decipher the starting point and dispersion of sedimentary rocks as far as the physico-compound and organic procedures that prompted their development.