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onlap

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1
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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Onlap
Onlap or overlap is the geological phenomenon of successively wedge-shaped younger rock strata extending progressively further across an erosion surface wikipedia.org
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Fillet (geology)
The fillet is characterized by an onlap contact with the adjacent rock and by a shallow or concave profile. wikipedia.org
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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... Oxford English Dictionary
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Lake Disappear
Formation), to fully marine, open sea, aerobic conditions (Glen Massey Formation) is evidenced by near shore accumulation of the bioclastic Elgood Limestone, onlap wikipedia.org
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Musgrave Block
Palaeozoic rocks Several Palaeozoic to neoproterozoic sedimentary basins onlap the Musgrave Block, and are exposed mostly around its edges. wikipedia.org
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Type 1 and type 2 sequence
, and onlap of overlying strata". Similarly, a type 2 sequence boundary is "marked by subaerial exposure and a downward shift in coastal onlap landward of the depositional-shoreline break wikipedia.org
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Parnaíba Basin
The Riachão III sequence is a wedge-shaped package of low amplitude continuous reflectors that onlap the top of the Riachão II sequence to the west. The Riachão II sequence is a wedge-shaped package of very low amplitude discontinuous reflectors that onlap the top of the Riachão I sequence to the east wikipedia.org
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Silverpit crater
layers of rock down to the Permian (with an age of about 250 million years) are synclinically folded, and that sediments of Tertiary age at the crater onlap wikipedia.org
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地震地层学
地层在地质剖面上所观察到的削蚀（erosion），顶超（toplap），上超（onlap）及下超（downlap）等沉积构造。在地震剖面均可认出。 wikipedia.org
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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 wikipedia.org
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Unconformity
Buttress unconformity A buttress unconformity also known as onlap unconformity, occurs when younger bedding is deposited against older strata thus influencing wikipedia.org
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Offshore Indus Basin
Onlap of the Miocene and younger stratigraphy on the southeast side of the ridge confirms the age of the ridge and resultant hanging wall uplift. wikipedia.org
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Seismic stratigraphy
Hence, onlap, down lap and top lap and other depositional features observed on surface outcrops have been demonstrated on seismic profiles. The maximum sea-level rise is represented by the highest onlap position on a sequence boundary and the minimum sea-level fall by the lowest onlap position wikipedia.org
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Permian Basin (North America)
This formation reaches a maximum thickness of but thins out significantly as it approaches the basin margins due to transgressive onlap. wikipedia.org
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