unconformity

[uhn-kuhn-fawr-mi-tee]

un·con·form·i·ty

[uhn-kuhn-fawr-mi-tee]
noun, plural un·con·form·i·ties.
1.
lack of conformity; incongruity; inconsistency.
2.
Geology.
a.
a discontinuity in rock sequence indicating interruption of sedimentation, commonly accompanied by erosion of rocks below the break.
b.
the interface between such strata.

Origin:
1590–1600; un-1 + conformity
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
Cite This Source Link To unconformity

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Unconformity is always a great word to know.
So is porosity. Does it mean:
to dissolve out soluble constituents from ashes and soil by percolation
ratio of the volume of the pores of a substance to the total volume of the mass
Collins
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

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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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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