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A horizontal bed on a geological map has an outcrop that

  • A.forms concentric circles about a point
  • B.cannot be shown on a map at all
  • C.follows the topographic contours
  • D.runs in a straight line across the map

Answer: C

Correct answer: follows the topographic contours

A horizontal bed has a constant elevation, so it crops out wherever the ground reaches that elevation - which is the definition of a contour. The outcrop trace and the contour of the same height therefore coincide, and this is the quickest way to identify horizontal strata on a map.

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