unconformity

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noun un·con·for·mi·ty \ˌən-kən-ˈfȯr-mə-tē\

Definition of unconformity

  1. 1 archaic :  lack of conformity

  2. 2a :  lack of continuity in deposition between rock strata in contact corresponding to a period of nondeposition, weathering, or erosionb :  the surface of contact between unconformable strata

Circa 1600

First Known Use of unconformity

circa 1600

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