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An isopachyte is a line joining points of equal

  • A.ground elevation
  • B.dip angle
  • C.bed thickness
  • D.bed elevation

Answer: C

Correct answer: bed thickness

Isopachytes map the thickness of a formation rather than its depth, and their pattern shows how the depositional basin behaved - where subsidence was greatest, where the formation thins onto a rising area, and where it dies out altogether. They answer a quite different question from structural contours.

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