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1. n. [Geology]

The termination of more steeply dipping overlying strata against a surface or underlying strata that have lower apparent dips; a term used to describe a particular geometry of reflections in seismic data in sequence stratigraphy.

See: apparent dipdiponlapsequence stratigraphy

Onlap, downlap, and progradation.
Onlap, downlap, and progradation.

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