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A disconformity is recognised by

  • A.no evidence of a break at all
  • B.an erosion surface between parallel beds
  • C.a discordance of dip between the sequences
  • D.sediment resting on granite

Answer: B

Correct answer: an erosion surface between parallel beds

A disconformity has beds parallel above and below, so there was no tilting, but the contact is a recognisable erosion surface, often channelled or with a lag of pebbles. The break is real and visible; only the angular discordance is missing.

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