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    Onlap

    Topic: Earth

     From Handwiki - Reading time: 1 min

    Onlap or overlap is the geological phenomenon of successively wedge-shaped younger rock strata extending progressively further across an erosion surface cut in older rocks. It is generally associated with a marine transgression. It is a more general term than overstep, in which the younger beds overlap onto successively older beds.[1] The opposite is offlap, in which each younger rock bed pinches out short of the full extent of the underlying older bed, typically due to a marine regression.[2]

    References

    1. ↑ Jackson, Julia A., ed (1997). "onlap". Glossary of geology. (Fourth ed.). Alexandria, Virginia: American Geological Institute. ISBN 0922152349. 
    2. ↑ Jackson 1997, "offlap".




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