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In many geologic situations, a planar bed or fault surface may crop out at several locations. If the elevations of three points on the surface are known, then the “three‐point problem” solution can be used to determine the orientation of the bed or fault (see technique in Video 2 at https://youtu.be/GBpY_Vi0zMw). Figure 2.10a shows three points (A, B, C) on a topographic map. These three points lie on the upper surface of a sandstone layer. The problem is to determine the attitude of the layer.