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Figure P2.5 is a topographic map. Points A, B, and C are outcrop points of the upper surface of a planar coal seam. Point Z is an outcrop point of the base of the coal seam.

1 Determine the attitude of the coal seam.

2 Draw the outcrop pattern of the coal seam.

3 Determine the thickness of the coal seam. Attach any drawings and computations you use.

Figure 2.15 Determination of outcrop pattern of a gently bent surface using structure contours. (a) Attitude of a gently folded marker bed at three points on a topographic map. (b) Interpolation of elevations between points of known elevation. (c) Structure‐contour map of a gently folded bed. (d) Structure‐contour map superimposed on topographic base. (e) Inferred outcrop pattern of marker bed.