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[uhn-kuh n-fawr-muh-buh l] /ˌʌn kənˈfɔr mə bəl/
not conformable; not conforming.
Geology. indicating discontinuity of any type in a stratigraphic sequence.
Origin of unconformable
1585-95; un-1 + conformable
Related forms
unconformability, noun
unconformably, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for unconformable
  • The unconformable basal contact locally contains a bed of reworked phosphatic vertebrate and invertebrate fossils.
  • The contact between the members is sharp and unconformable.
  • The basal contact with the underlying unit is sharp and unconformable.
  • The lower contact is conformable in the northern portion of the basin and unconformable in the southern portion of the basin.
  • Based on the abrupt change in shale type, the contact is inferred to be unconformable.
British Dictionary definitions for unconformable


not conformable or conforming
(of rock strata) consisting of a series of younger strata that do not succeed the underlying older rocks in age or in parallel position, as a result of a long period of erosion or nondeposition
Derived Forms
unconformability, unconformableness, noun
unconformably, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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