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Topic: Peneplain


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In the News (Fri 17 Feb 12)

  
  Peneplain - Wikipedia, the free encyclopedia
Canisteo River Valley from Pinnacle State Park The distant peaks at the same elevation represent the remnants of a peneplain that was uplifted to form the Allegheny Plateau, which is a dissected plateau in southwestern NY.
A peneplain is final stage in fluvial or stream erosion.
The streams within a peneplained region show extensive meandering and braiding.
en.wikipedia.org /wiki/Peneplain   (238 words)

  
 Geology of the Appalachians - Biocrawler
The pattern of the folded strata on the low lying Cretaceous peneplain must have resembled the pattern of the curved grain of wood on a planed board.
When the peneplain was uplifted the weaker strata were worn down almost to a lowland of a second generation, while the resistant sandstones, of which there are three chief members, retained a great part of their new-gained altitude in the form of long narrow even-crested ridges with an occasional sharp bending in peculiar zigzags.
Certain districts within the mountains, apparently consisting of less resistant crystalline rocks, have been reduced to basin-like peneplains in the same amount of time that served only to grade the slopes and subdue the summits of the neighboring mountains of more resistant rocks.
www.biocrawler.com /encyclopedia/Geology_of_the_Appalachians   (5316 words)

  
 1301.0 - Year Book Australia, 1918
A “peneplain” is defined as an extensive area of plateau or low land with undulating surface, bounded by plateaus or plateau remnants, the latter rarely rising as much as 2,000 feet above the “peneplain” at its base.
Fine examples of these peneplains occur within, and in the neighbourhood of, the Great Australian Artesian Basin, the Nullarbor Plains, the South-east of South Australia, the North-west of Victoria and the district to the South and South-east of Darwin.
These lowland peneplains of the inland areas may be covered with pebbles, either of residual or later concretionary origin, long parallel ridges of sand 200 to 1,000 yards apart and 10-50 feet high, or with clay pans, blown dust, or alluvium.
www.abs.gov.au /Ausstats/abs@.nsf/dc057c1016e548b4ca256c470025ff88/441e5ce67698323cca2569de001f1084!OpenDocument   (4102 words)

  
 1301.0 - Year Book Australia, 1927
Only on the margins of the great peneplain, where rivers are busily cutting down the scarps, is there a zone of youthful rivers, and this feature is well marked near Perth and along the north coast of the continent.
The country is a peneplain rising from the coast to a height of 4,000 feet at Mount Bruce.
It is a portion of the Great Peneplain which has long been actively attacked by many rivers and streams, hence the topography is somewhat different from that of the rest of the State.
www.abs.gov.au /ausstats/abs@.nsf/94713ad445ff1425ca25682000192af2/de8e19c3c280edb3ca2569de001f1088!OpenDocument   (7329 words)

  
 The United States - LoveToKnow 1911   (Site not responding. Last check: 2007-10-21)
The peculiar configuration of thr~ ridges may be apprehended as follows: The pattern of the folded ~trata on the low-lying Cretaceous peneplain must have resembled the pattern of the curved grain of wood on a planed board.
The peneplain is no longer in the cycle of erosion that witnessed its production; it appears to have suffered a regional elevation, for the riversthe upper Missouri and its branchesno longer flow on the surface of the plain, but in well graded, maturely opened valleys, several hundred feet below the general level.
Here the streams that drain the higher areas descend to the plains through narrow canyons in the mountain border, impassable for ordinary roads and difficult of entrance even by railways; a well-known example is the gorge of Clear Creek east of the Georgetown mining district.
www.1911encyclopedia.org /The_United_States   (12542 words)

  
 Amateur Geologist Structured Geological Glossary: Landforms
An idealized model of erosion wherein a plain is uplifted epeirogenically, then dissected by rapid streams (youth), then rounded by downslope movements into a landscape of steep hill (maturity), and finally reduced to a new peneplain at sea level (old age).
Portion of the earth's system involved in the movement and mass transfer of substances through the cycle of weathering, erosion, transportation, deposition, burial, diagenesis and uplift.
A stage in the geomorphic cycle, characterized by formation of a peneplain near sea level.
www.amateurgeologist.com /content/glossary/structural/landforms.html   (1057 words)

  
 "Documents Descriptive of Topography of the Coast of Labrador and of Conditions in General on the Coast." Volume V ...
The almost universal absence of a true soil along the shore is also largely explained by the severe washing of the shore-belt during the recent submergence.
Throughout the southern half of the northeast coast, that is, from Belle Isle Strait to Ford Harbor, near Wain Mission Station, the general shape of the country is determined by the seaward downwarping of the old-mountain peneplain.
This bold topography may be due partly to specially great upwarping of the old-mountain peneplain, but probably the high relief is due to the nature of the rock—technically called a gabbro.
www.heritage.nf.ca /law/lab5/labvol5_2533.html   (2230 words)

  
 GES 101:8
An old age landscape is composed of a peneplain with some monadnocks.
Peneplains are a low nearly featureless plain produced by erosional processes in humid fluvial (river) environments.
The peneplain may be uplifted or rejuvenated to begin a new cycle of erosion.
www.uccs.edu /~sjenning/ges101:8.html   (744 words)

  
 Wilson Cycle-Stage A: Stable Continental Craton
The continent is eroded down nearly to sea level everywhere (a peneplain); it is dead flat from edge to edge and corner to corner and there is no tectonic activity anywhere.
On the surface is a blanket of mature quartz sandstone (QFL, yellow field), the result of millions of years of weathering and erosion and sorting.
Light enough that when eroded to a peneplain, and "floating" in isostatic equilibrium, it's surface is a few hundred feet above sea level.
csmres.jmu.edu /geollab/Fichter/Wilson/StageA.html   (271 words)

  
 [No title]
This slight discordance of surface and bedding is one of the indications that the present surface is a peneplain and not an original sea bottom which has been lifted up and not eroded.
Age of the Peneplain.-This peneplain was complete at some time not very long bef ore the glacial epoch, that is, in the Tertiary period.
Remnants of the old peneplain rising to a common level are sufficiently numerous so that in any extended view from one of these uplands the horizon is flat.
www.uc.edu /geology/fenneman/chapt6a-txt.html   (9745 words)

  
 v14c in fm05
The intrusive phase of the FLIP consists primarily of a high level complex of dolerite sills and subordinate connecting and cross-cutting dikes that have intruded near the base of and within flat-lying Devonian to Triassic supracrustal strata of the Beacon Supergroup.
A sequence of dikes in the southeastern Quartermain Mtns that cross cut sills in that region have compositions similar to the basement and peneplain sills in the Bull Pass region.
Differences in the compositions of the basement and peneplain sills in each region hint at the possibility that they may be different intrusions.
www.agu.org /cgi-bin/SFgate/SFgate?&listenv=table&multiple=1&range=1&directget=1&application=fm05&database=/data/epubs/wais/indexes/fm05/fm05&maxhits=200&="V14C"   (3676 words)

  
 Geology
The peneplain surface is well marked by either yellow-grey-white sandstone resting on a basement of granites, gneisses and schists, or by a chocolate coloured dolerite sill about 1000 – 1200ft thick which has intruded in Jurassic time between the sandstone and the basement.
Dolerites and sandstone are known from Northern Victoria Land, and the continued existence of the Kukri Peneplain is probable and the accordance of summits seen in the Roberson Bay Group greywackes suggests it might have extended north-east to the Ross Sea and north to the Cape Hallet region.
Remnants of the Peneplain Sill on the skyline.
www.rosssea.info /geology.html   (8357 words)

  
 Ohio Valley Environmental Coalition
In the Cretaceous Period this peneplain was gently uplifted again to a great plateau during the same time the Rocky Mountains were formed.
Also lifted were the rivers of the peneplain which, once elevated, carved steep valleys and canyons into the plateau which was the remnant of the original Appalachian Mountains.
These flat and narrow tops of the Appalachian Peneplain are what we can see in the distance from a viewing position on the state's highest peaks.
www.ohvec.org /old_site/mountains02.htm   (626 words)

  
 LATE CENOZOIC PALEOCHANNEL MINERAL DEPOSITS OF THE TRANS-URALS PENEPLAIN
Late Cenozoic landscapes of the south flank of the Trans-Urals peneplain shaped in response to inherited planation and low erosion in terms of gradual replacement of warm humide conditions by semi-arid conditions in Miocene and by alteration of cold semi-humide and semi-arid conditions during the Pliocene-Quaternary.
The area of peneplain is characterized by branched paleodrainage, among which the Miocene and Pliocene-Early Quaternary paleo-ravines and paleo-valleys are the most saved.
Within boundaries of the Trans-Urals peneplain more ancient (Mesozoic) gold and uranium paleochannel are also known.
gsa.confex.com /gsa/inqu/finalprogram/abstract_55015.htm   (355 words)

  
 Peneplain Jazz Project - Band page with free MP3 music downloads on SoundClick   (Site not responding. Last check: 2007-10-21)
Talented, professional, flexibile and original are just some of the words used to describe the Peneplain Jazz Project.
Peneplain - an area worn down almost to a plain by erosion.
The foothills outside Boulder, CO (where we are located) are an uplifted peneplain.
www.soundclick.com /bands/pageartist.cfm?bandID=255569   (193 words)

  
 Ohio Valley Environmental Coalition
The river's origin was in the original Appalachian Mountains which it substantially wore down to the Appalachian Peneplain.
Its course was from the Blue Ridge in North Carolina, then northerly across Virginia and along the same northwesterly route as is followed by the New and Kanawha Rivers today, then to Huntington, Ashland (Ky.) and Portsmouth (Oh.) where it swerved northward to Chillicothe (Oh.).
When the peneplain was uplifted into the plateau, the river was carried upward on the surface of the rising land.
www.ohvec.org /old_site/streams05.htm   (523 words)

  
 Uruguay 2
In spite of a relatively uniform climate, the differences in the soils from the physical, chemical and biological point of view, as well as associated characters (mainly topography and drainage), determine that soils vary a lot in their suitability for agricultural use and in the modalities of handling that they require.
This peneplain as a whole does not exceed 200 metres in height.
Lower forms of relief are located on the periphery of the peneplain, formed from sedimentary rocks, arranged horizontally with gentle slopes and difficult drainage, where marshlands are frequently found.
www.fao.org /WAICENT/faoinfo/Agricult/AGP/agpc/doc/counprof/uruguay/Uruguay2.htm   (3037 words)

  
 Johnston County - Johnston Soil and Water Conservation District
On the way to Aqaba we crossed a remarkable landscape, a plateau that had been eroded through the ages almost to a plain, called a peneplain in physiographic language.
Topographically, these two plains are parts of same peneplain that once spread unbroken across the region.
But toward the end of Pliocene times - that is, just before the beginning of the ice age - a series of parallel faults let down into it the great rift valley to from one of the most spectacular examples of disturbances in the earth's crust that is known to geologists.
www.johnstonnc.com /mainpage.cfm?category_level_id=722&content_id=1306   (789 words)

  
 The Rock History Story
The land was reduced to an almost flat surface, near sea level, called the Schooley Peneplain.
As one stands on the observation deck in Perkins Tower, at the top of Bear Mountain, and looks to the west or north the very flat horizon that is observed represents the remains of a peneplain formed in ancient times.
Renewed uplift of the region during the Miocene Epoch of the Tertiary Period of the Cenozoic Era, resulted in erosion cutting into this level surface, which was further modified by glaciers and recent water erosion.
www.bearmountainzoo.org /rockhistory.htm   (1262 words)

  
 OUP Canada: Unit 42   (Site not responding. Last check: 2007-10-21)
The Davisian cycle of erosion holds that a landscape's underlying geologic structure is being acted upon by streams and other erosional processes, and thus the landscape is at a certain stage of degradation with the final stage characterized by a nearly flat surface known as peneplain.
An alternative theory suggests that slope retreat reduces highlands to pediplanes, which are planes at the foot of mountains.
A prominent, not-yet-eroded remnant of an upland on a peneplain.
www.oup.com /ca/he/companion/deblij/st_index/st_guide/unit42   (1020 words)

  
 [No title]   (Site not responding. Last check: 2007-10-21)
Structure of the Appalachians is a consequence of the Taconic, Acadian, and Allegheny orogenies.
and the subsequent Triassic (Newark Series) and Jurassic was eroded to a peneplain by the Early Cretaceous.
Early Cenozoic drainage was established across the peneplain and Cretaceous to Early Cenozoic cover.
www.clas.ufl.edu /users/pciesiel/gly3150/appalachians.html   (391 words)

  
 East African Mountains   (Site not responding. Last check: 2007-10-21)
The peneplain of eastern Africa, dating from the Miocene Epoch (between 23.7 and 5.3 million years ago), has been subject to a general elevational movement.
The shoulders of the rift valleys have risen intermittently to produce highlands on which lavas that have been ejected from fissures in the Earth's surface have in some instances added considerable height.
Major eruptions occurred in 1938 and 1948 and during the 1970s, and on several occasions a lava stream has reached the shores of Lake Kivu.
www.iris.edu /news/events/congo/EAfricaMountains.htm   (284 words)

  
 Peneplain Jazz Project - Jazz Band - Denver, CO - Denver County, Colorado
Peneplain Jazz Project - Jazz Band - Denver, CO - Denver County, Colorado
Peneplain did a great job for our event.
Please note, in addition to Denver, Peneplain Jazz Project also serves the surrounding towns of Lakewood, Lowry Afb, Aurora, Englewood, Wheat Ridge, Westminster, Dupont, Commerce City, Arvada, Littleton, Broomfield, Golden, Eastlake, Henderson, Highlands Ranch, Highlands, Morrison, Idledale, Brighton, Indian Hills and many other locations in and around the Denver area.
www.gigmasters.com /jazz/PeneplainJazzProject   (874 words)

  
 View Comments
I will definitely refer Peneplain to friends and colleagues, and if we ever need music services in the future, Peneplain will be our definitive choice.
Peneplain Jazz Project provided just the perfect atmosphere for our event, and the musicians were a pleasure to work with.
Not only were they professional and great to work with, they were very accommodating when we completely changed our theme and budget.
www.gigmasters.com /viewcomment.asp?rowid=10513   (851 words)

  
 Geography, Weather, Geology
What is left are only ancient granite hills which lie west of Lake Superior's North Shore and the Laurentian peneplain.
This peneplain (literally "almost a plain") is a vast, nearly level platform that extends from northeastern Minnesota up through central Canada.
About one billion years ago ancient seas submerged this peneplain again and again, and then finally retreated to make this the first large part of North America to be more or less permanently elevated above sea level.
www.yellowpages.state.mn.us /is/yellowpages.nsf/059eefc5b0cd22be86256b21007e2c0e/be8f41b89cee827c86256b1f0059773b?OpenDocument   (1064 words)

  
 peneplain - OneLook Dictionary Search
Tip: Click on the first link on a line below to go directly to a page where "peneplain" is defined.
peneplain : The American Heritage® Dictionary of the English Language [home, info]
Phrases that include peneplain: also peneplane peneplain, peneplain also peneplane
www.onelook.com /?w=peneplain   (192 words)

  
 Landforms
The Peneplain Sill (Ferrar Dolerites) lies on the Kukri Peneplain cut in granites, on the far side of the Miller glacier, Gonville and Caius Range.
At the Kar Plateau at Granite Harbour the Kukri Peneplain or a flat eroded surface which is almost certainly it, lies at about 2-300ft compared to about 800ft to the south on the Miller Glacier.
The basement granites, the Kukri Peneplain, the Peneplain Sill and the overlying Beacon Sandstone are all plainly seen.
rosssea.info /landforms.html   (4280 words)

  
 Peneplain Peak
Located on the divide between Coquitlam River and Pitt Lake, north of Widgeon Lake and south of the Five Fingers Group, Peneplain is notable for preserving on its upper surface a chunk of the Eocene erosional surface which predates the formation of the Coast Mountains.
In Eocene times (early Tertiary), the Coast Mountains did not exist and the area today occupied by them was an essentially level surface of low relief (a peneplain).
Orogenic uplift resulting from new crustal motion in the late Tertiary, followed by Pleistocene glaciation and erosion, has tended to destroy most of the original peneplain surface.
www.bivouac.com /MtnPg.asp?MtnId=1177   (158 words)

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