Dissected plateau: Difference between revisions
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{{short description|Plateaus area that has been severely eroded so that the relief is sharp}} | {{short description|Plateaus area that has been severely eroded so that the relief is sharp}} | ||
{{globalize|article|the USA and other English-language countries|date=November 2015}} | {{globalize|article|the USA and other English-language countries|date=November 2015}} | ||
[[File:A melhor hora para visitar o morro é ao entardecer.JPG|thumb | [[File:A melhor hora para visitar o morro é ao entardecer.JPG|thumb|View of the dissected plateau at [[Chapada Diamantina]], [[Brazil]].]] | ||
[[File:WV plateau.jpg|right|thumbnail|Shaded relief map of the Cumberland Plateau and the Ridge and Valley Appalachians on the Virginia/West Virginia border]] | [[File:WV plateau.jpg|right|thumbnail|Shaded relief map of the Cumberland Plateau and the Ridge and Valley Appalachians on the Virginia/West Virginia border]] | ||
A '''dissected plateau''' is a [[plateau]] area that has been severely eroded, and the relief is sharp. Such an area may be referred to as mountainous, but dissected plateaus are distinguishable from [[orogen]]ic mountain belts by the lack of [[fold (geology)|folding]], [[Metamorphic rock|metamorphism]], extensive [[Geological fault|faulting]], or [[magma]]tic activity accompanying [[orogeny]]. | A '''dissected plateau''' is a [[plateau]] area that has been severely eroded, and the relief is sharp. Such an area may be referred to as mountainous, but dissected plateaus are distinguishable from [[orogen]]ic mountain belts by the lack of [[fold (geology)|folding]], [[Metamorphic rock|metamorphism]], extensive [[Geological fault|faulting]], or [[magma]]tic activity accompanying [[orogeny]]. | ||
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==Distribution== | ==Distribution== | ||
The [[Allegheny Plateau]],<ref>Jones, Stephen B.1; Saviello, Thomas B [http://www.ingentaconnect.com/content/saf/njaf/1991/00000008/00000001/art00002;jsessionid=ch9ro92dh3bn2.alice?format=print ''A Field Guide to Site Quality for the Allegheny Hardwood Region''] {{Webarchive|url=https://web.archive.org/web/20121004164713/http://www.ingentaconnect.com/content/saf/njaf/1991/00000008/00000001/art00002;jsessionid=ch9ro92dh3bn2.alice?format=print |date=2012-10-04 }} Northern Journal of Applied Forestry, Volume 8, Number 1, 1 March 1991, pp. 3–8(6)</ref> the [[Cumberland Plateau]],<ref>[ | The [[Allegheny Plateau]],<ref>Jones, Stephen B.1; Saviello, Thomas B [http://www.ingentaconnect.com/content/saf/njaf/1991/00000008/00000001/art00002;jsessionid=ch9ro92dh3bn2.alice?format=print ''A Field Guide to Site Quality for the Allegheny Hardwood Region''] {{Webarchive|url=https://web.archive.org/web/20121004164713/http://www.ingentaconnect.com/content/saf/njaf/1991/00000008/00000001/art00002;jsessionid=ch9ro92dh3bn2.alice?format=print |date=2012-10-04 }} Northern Journal of Applied Forestry, Volume 8, Number 1, 1 March 1991, pp. 3–8(6)</ref> the [[Cumberland Plateau]],<ref>[https://pubs.usgs.gov/prof/p1151h/physiography.html ''PHYSIOGRAPHY''] {{Webarchive|url=https://web.archive.org/web/20080514005658/http://pubs.usgs.gov/prof/p1151h/physiography.html |date=2008-05-14 }} Wayne L. Newell</ref> the [[The Ozarks|Ozark Plateau]],<ref>{{Cite web |url=http://www.theozarkschronicle.com/archives/sciencemar07.htm |title=The Ozarks Chronicle |access-date=2007-12-19 |archive-url=https://web.archive.org/web/20080403085639/http://theozarkschronicle.com/archives/sciencemar07.htm |archive-date=2008-04-03 |url-status=dead }}</ref> and the [[Catskill Mountains]]<ref>[http://www.catskillcenter.org/atlas/geomorphology/geo_1_3dtopography.htm Catskill Center] {{webarchive|url=https://web.archive.org/web/20091029034005/http://www.catskillcenter.org/atlas/geomorphology/geo_1_3dtopography.htm |date=2009-10-29 }}</ref> in the United States, the [[Blue Mountains (Australia)|Blue Mountains]] and [[Hornsby Plateau]] in [[Australia]], and the [[Deccan Plateau]] in [[India]] are examples of dissected plateaus formed after regional uplift.{{cn|date=August 2022}} | ||
These older [[Tectonic uplift|uplifts]] have been eroded by [[Creek (stream)|creeks]] and [[river]]s to develop steep relief not immediately distinguishable from [[mountain]]s.{{cn|date=August 2022}} | These older [[Tectonic uplift|uplifts]] have been eroded by [[Creek (stream)|creeks]] and [[river]]s to develop steep relief not immediately distinguishable from [[mountain]]s.{{cn|date=August 2022}} | ||
Latest revision as of 15:40, 3 November 2025
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A dissected plateau is a plateau area that has been severely eroded, and the relief is sharp. Such an area may be referred to as mountainous, but dissected plateaus are distinguishable from orogenic mountain belts by the lack of folding, metamorphism, extensive faulting, or magmatic activity accompanying orogeny.
Formation
A dissected plateau may also be formed, usually on a comparatively small scale, by the levelling of terrain by planing and deposition beneath an ice sheet or perhaps an ice cap.Script error: No such module "Unsubst".
Subsequently, during the same or a later glacial period, the margins of the glacial till plain are removed by glaciers, leaving the plateau into which erosion by water incises valleys. Such a plateau may be level or gently sloping but may be distinguished by the till caps on its hills. Glacial till is still widely known in Britain by the older name of boulder clay.Script error: No such module "Unsubst".
Dissected volcanic plateaus include the Pajarito Plateau in New Mexico, on the skirt of the enormous Valles Caldera.[1] Isolated portions of this plateau are known as mesas, and long, connected portions are known as potreros.
Distribution
The Allegheny Plateau,[2] the Cumberland Plateau,[3] the Ozark Plateau,[4] and the Catskill Mountains[5] in the United States, the Blue Mountains and Hornsby Plateau in Australia, and the Deccan Plateau in India are examples of dissected plateaus formed after regional uplift.Script error: No such module "Unsubst".
These older uplifts have been eroded by creeks and rivers to develop steep relief not immediately distinguishable from mountains.Script error: No such module "Unsubst".
Many areas of the Allegheny Plateau and the Cumberland Plateau, at the western edge of the Appalachian Mountains of eastern North America, are called "mountains" but are actually dissected plateaus. One can stand on the top of one of these high "mountains" and note that all the other tops are nearly the same height, representing the original elevation profile of the plain before uplift and thereafter the subsequent weather erosion.Script error: No such module "Unsubst".
See also
- Template:Annotated link
- Template:Annotated link, denudational uplands or dissected plateaus in Turkic toponymy of Russia and Central Asia
References
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- ↑ Script error: No such module "citation/CS1".
- ↑ Jones, Stephen B.1; Saviello, Thomas B A Field Guide to Site Quality for the Allegheny Hardwood Region Template:Webarchive Northern Journal of Applied Forestry, Volume 8, Number 1, 1 March 1991, pp. 3–8(6)
- ↑ PHYSIOGRAPHY Template:Webarchive Wayne L. Newell
- ↑ Script error: No such module "citation/CS1".
- ↑ Catskill Center Template:Webarchive
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