onlap

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English

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Etymology

From on +‎ lap.

Noun

onlap (plural onlaps)

  1. (geology) The phenomenon of successively younger rock strata extending progressively further across an erosion surface cut in older rocks.
    • 2001 December 14, Senthil Kumar et al., “Earthquake Recurrence and Rupture Dynamics of Himalayan Frontal Thrust, India”, in Science‎, volume 294, number 5550, →DOI, pages 2328–2331:
      Displacement on F3 was followed by continued accumulation and onlap of the fine-grained sands of unit 3 on the footwall and development of soil Qb2.

Synonyms

Verb

onlap (third-person singular simple present onlaps, present participle onlapping, simple past and past participle onlapped)

  1. (geology) To form an onlap.
    • 1998 March 6, Roger J. Phillips, Vicki L. Hansen, “Geological Evolution of Venus: Rises, Plains, Plumes, and Plateaus”, in Science‎, volume 279, number 5356, →DOI, pages 1492–1497:
      Elsewhere, many of the youngest volcanic plains units onlap tesserae at crustal plateau boundaries.

Antonyms

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