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A basal conglomerate immediately above an unconformity represents

  • A.material precipitated from solution
  • B.a lava flow filling the surface
  • C.a fault breccia formed by movement
  • D.debris from the eroded surface beneath

Answer: D

The first sediment laid on a newly submerged land surface is the coarse waste lying on it, so the clasts are commonly of the underlying rock. Recognising them confirms the surface as an unconformity rather than a fault.

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