What is want of parallelism between one series of strata and another, especially when due to a disturbance of the position of the earlier strata before the latter were deposited called?

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unconformability — (Geol.) Want of parallelism between one series of strata and another, especially when due to a disturbance of the position of the earlier strata before the latter were deposited. (Webster's 1913.)

What is want of parallelism between one series of strata and another, especially when due to a disturbance of the position of the earlier strata before the latter were deposited called?

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