onlap
English
Etymology
Noun
onlap (plural onlaps)
- (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[1], volume 294, number 5550, , 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
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- (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[2], volume 279, number 5356, , pages 1492-1497:
- Elsewhere, many of the youngest volcanic plains units onlap tesserae at crustal plateau boundaries.