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A primary geological structure is one formed

  • A.at the time the rock itself formed
  • B.by later deformation of the rock
  • C.only in metamorphic rocks
  • D.only by human excavation

Answer: A

Bedding, cross-bedding, ripple marks and columnar jointing all originate with the rock and record its environment. Folds and faults are secondary, being imposed afterwards by stresses acting on rock that already existed.

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