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hiatal

1. adj. [Geology]

Pertaining to a hiatus, a cessation in deposition of sediments during which no strata form or an erosional surface forms on the underlying strata; a gap in the rock record. This period might be marked by development of a lithified sediment (hardground) or burrowed surface characteristic of periods when sea level was relatively low. A disconformity can result from a hiatus.

See: conformabledisconformityeustasyhardgroundlithificationsedimentsequence stratigraphystratumunconformity

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