unconformity

noun
un·​con·​for·​mi·​ty | \ ˌən-kən-ˈfȯr-mə-tē How to pronounce unconformity (audio) \

Definition of unconformity

1a : 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
2 archaic : lack of conformity

First Known Use of unconformity

circa 1600, in the meaning defined at sense 2

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The first known use of unconformity was circa 1600

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