noun, plural unconformities.
lack of conformity; incongruity; inconsistency.
a discontinuity in rock sequence indicating interruption of sedimentation, commonly accompanied by erosion of rocks below the break.
the interface between such strata. See illus. under unconformable.

1590–1600; un-1 + conformity

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World English Dictionary
unconformity (ˌʌnkənˈfɔːmɪtɪ)
n , pl -ties
1.  lack of conformity
2.  the contact surface between younger and older rocks representing a discontinuity in the geological record. Most commonly it represents an erosional surface

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American Heritage
Science Dictionary
unconformity   (ŭn'kən-fôr'mĭ-tē)  Pronunciation Key 
A surface between successive strata representing a missing interval in the geologic record of time, produced either by an interruption in deposition or by the erosion of depositionally continuous strata followed by renewed deposition. An unconformity is a type of discontinuity.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
If this happened in a geological sequence it would be called an unconformity.
The exposures of the unconformity between the ancient quartzite and the overlying sandstone are world famous.
The unconformity at the top of the paleosols and the base of the coal is interpreted as a fourth-order sequence boundary.
The gap in time between the igneous rocks forming and the conglomerate is our great unconformity.
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