Simple expressions for the estimation of dip or lateral extent of a bed whose extent is large compared to its thickness have been developed. Let rho CA be the apparent density contrast between the bed and its surroundings as measured by a borehole gravimeter and rho CT the true density contrast measured by a gamma-gamma density log. Then for a dipping bed:Equationwhere alpha is the dip angle.For a horizontal bed of finite extent:Equationwhere t/w is the ratio of the bed thickness to its horizontal extent. For dipping beds of finite lateral extent the expression is more complicated. Numerical solutions were obtained and graphed.

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