unconformity

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un·con·for·mi·ty

 (ŭn′kən-fôr′mĭ-tē)
n. pl. un·con·for·mi·ties
1. Lack of conformity; nonconformity.
2. Geology A surface between successive strata representing a missing interval in the geologic record of time, and produced either by an interruption in deposition or by the erosion of depositionally continuous strata followed by renewed deposition.

unconformity

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

un•con•form•i•ty

(ˌʌn kənˈfɔr mɪ ti)

n., pl. -ties.
1. lack of conformity; incongruity; inconsistency.
2. Geol. a discontinuity in a stratigraphic sequence.
[1590–1600]

unconformity

A level where sedimentary rocks cover an older rock surface partly removed by erosion. The level marks a time gap.