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单词 offlap
释义

offlap

/ˈɒflap/
Geology
noun
A progressive diminution in the lateral extent of sedimentary deposits in passing upwards from older to younger strata, so that each stratum leaves a portion of the underlying one exposed; a set of strata exhibiting this, typically as a result of regression of a shoreline. Contrasted with onlap.

Origin

Early 20th century; earliest use found in Amadeus William Grabau (1870–1946). From off + lap, after overlap.

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更新时间:2024/12/23 22:39:22