What does unconformity mean?

Looking for the meaning or definition of the word unconformity? Here's what it means.

Noun
  1. (nonstandard) a lack of conformity
  2. (geology) a gap in time in rock strata, where erosion occurs while deposition slows or stops
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The syn-rift succession overlies Eocene to Oligocene pre-rift strata with an angular unconformity.
The unconformity surface is overlain by sandstone, reworked chalk or tuff, and represents submarine or subaerial erosion and missing section.
Van Dijk et al. emphasized the absence of deep erosional incision in the geometry of the unconformity.
The stratal geometries that are characteristic of the unconformity depend strongly on structural and geographical position within the basin.
Data on a systemic boundary unconformity on the west Newfoundland shelf are more problematic.
Extensional faults are planed by a regional unconformity that is overstepped by Permian to Cretaceous strata.

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