Discussion
Match the unconformity with its defining relation.
1. Angular unconformity 2. Nonconformity 3. Paraconformity
P. Sediment on igneous or metamorphic rock Q. Discordant dips above and below R. Parallel beds with no visible break
Answer: A
Correct answer: 1-Q, 2-P, 3-R
The three are distinguished by what can be seen at the contact. An angular unconformity shows discordant dips, implying tilting between the two episodes. A nonconformity puts sediment straight onto crystalline basement, implying deep erosion. And a paraconformity shows nothing at all - parallel beds, no erosion surface - and is found only from the ages.
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