Dictionary

unconformity

noun un·con·for·mi·ty \-ˈfr-mə-tē\

Definition of UNCONFORMITY

1
archaic :  lack of conformity
2
a :  lack of continuity in deposition between rock strata in contact corresponding to a period of nondeposition, weathering, or erosion
b :  the surface of contact between unconformable strata
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First Known Use of UNCONFORMITY

circa 1600

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