In geology unconformability describes a want of parallelism between one series of strata and another, especially when it is due to a disturbance of the position of the earlier strata before the latter were deposited. Research Unconformability
In geology, unconformity describes a want of parallelism between strata in contact. With some authors unconformity is equivalent to unconformability; but it is often used more broadly, for example, to include the case when the parallelism of strata once conformable has been disturbed by faulting and the like. Research Unconformity
 
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