[uhn-kuh n-fawr-mi-tee]

noun, plural un·con·form·i·ties.

lack of conformity; incongruity; inconsistency.
  1. a discontinuity in rock sequence indicating interruption of sedimentation, commonly accompanied by erosion of rocks below the break.
  2. the interface between such strata.

Origin of unconformity

First recorded in 1590–1600; un-1 + conformity
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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Historical Examples of unconformity

British Dictionary definitions for unconformity


noun plural -ties

lack of conformity
the contact surface between younger and older rocks representing a discontinuity in the geological record. Most commonly it represents an erosional surface
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for unconformity

c.1600, from un- (1) "not" + conformity. Geological sense is from 1829.

Online Etymology Dictionary, © 2010 Douglas Harper

unconformity in Science



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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.