**2.2 Building two models for formations densities' distributions**

To achieve the objective of the newly proposed method, the parameters of the rock' formations of depositions covering the basement rocks for study areas such as their thicknesses, depths, and their densities, should be prior known at least, in one controlling points (borehole data, geophysical data, etc.), and thus such parameters (formations' thicknesses, and densities), can be probably estimated and traced through the Bouguer gravity map's profile (s) from the known point to the other unknown points of the area of study. Hence, a two models for formations density distributions building to prove that, the heterogeneities or homogeneities of formations density distributions do not affect the resultants of depth calculation from gravity effects of the IHSs as follows.

*New Semi-Inversion Method of Bouguer Gravity Anomalies Separation DOI: http://dx.doi.org/10.5772/intechopen.101593*
