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[on-lap, awn-] /ˈɒnˌlæp, ˈɔn-/
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.
Origin of onlap
1945-50; on + lap3 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for onlap
  • 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.
  • The fill is represented by horizontal reflections that may onlap the depression or completely cover the subsided area.
  • Such onlap is not apparent along the northern and western margins, however.

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