Discussion
Three boreholes on a bed give elevations of 100, 80 and 60 m. The structural contours between them will be
Answer: C
Correct answer: evenly spaced straight lines, if the dip is uniform
A plane surface has straight, parallel and evenly spaced structural contours, exactly as a uniform slope does on a topographic map. Three points determine that plane, so the contours can be drawn by dividing the lines between the boreholes proportionally - which is the construction used to solve the three-point problem.
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