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A quarry face shows a bed dipping at 15 degrees, but boreholes indicate 35 degrees. The likely explanation is that the face

  • A.has been faulted since the boreholes were drilled
  • B.exposes a different bed from the boreholes
  • C.is oblique to the strike, showing an apparent dip
  • D.is perpendicular to the strike, showing the true dip

Answer: C

Correct answer: is oblique to the strike, showing an apparent dip

A quarry face is cut where it is convenient rather than perpendicular to the strike, and any oblique face shows an apparent dip less than the true one. Boreholes give the true attitude, so a face reading gentler than the boreholes is the expected result rather than a contradiction - and the two can be reconciled by the apparent dip relation.

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