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offlap
offlap Geol. (ˈɒflæp, ɔː-) Also off-lap. [f. off adv. + lap v.2, after overlap v. 3.] A progressive diminution in the lateral extent of conformable strata 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 ...
Oxford English Dictionary
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Onlap
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
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onlap
onlap Geol. (ˈɒnlæp) [f. on adv. + lap v.2, after offlap.] A progressive increase in the lateral extent of conformable strata in passing upwards from older to younger strata, so that each stratum is hidden by the one above; a set of strata exhibiting this.1947 F. A. Melton in Bull. Amer. Assoc. Petr...
Oxford English Dictionary
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overlap
▪ I. overlap, n. (ˈəʊvəlæp) [f. overlap v.] 1. a. An occurrence or instance of overlapping; a partial superposition or coincidence; the part or place at which one edge or thing overlaps another; spec. in Geol. (see next, 3). Also transf. and fig.1813 S. Smith Agric. Surv. Galloway 85 (Jam.) When the...
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Val Verde Basin
Ouachita orogeny:~318-271 Ma
As plate convergence from the Ouachita orogeny began and progressed from the north to the south, offlap and onlap stratigraphic
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Sedimentary rock
With regression, shallower facies are deposited on top of deeper facies, a situation called offlap.
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