[on-lap, awn-]
noun Geology.
the advance of a sea beyond its former shore.
the layer or layers of sedimentary rock formed on a sea floor as a result of this advance.
Compare offlap.

1945–50; on + lap3 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
The following trends occur and are based on the onlap relations of formations in the three basins.
Internal truncation, onlap, and offlap of reflections are all common.
Such onlap is not apparent along the northern and western margins, however.
The fill is represented by horizontal reflections that may onlap the depression or completely cover the subsided area.
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