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Comparing structural contours with isopachytes, structural contours show

  • A.the elevation of the ground surface
  • B.the dip of a formation directly
  • C.the elevation of a bedding surface
  • D.the thickness of a formation

Answer: C

Correct answer: the elevation of a bedding surface

Structural contours describe the shape and depth of a surface; isopachytes describe how thick a formation is. The two are independent - a bed can thicken while it descends, or thin while it descends - and answering a question about depth with a thickness map is a common confusion.

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