Peneplain


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peneplain

[′pēn·ə‚plān]
(geology)

Peneplain

 

a denudation plain that has formed where mountainous regions were leveled under humid conditions. In contrast, there are plains whose initially flat relief was the result of accumulation.

The peneplain concept was introduced into geomorphology in the late 19th century by the American geographer W. M. Davis, who considered the peneplain a theoretically conceivable concluding stage of the geographic cycle. According to Davis, the mechanism of peneplain formation consists in the reduction of every point of the surface of a mountainous region by subaerial erosion, but Davis’ explanation is not universally recognized. L. King disagreed with such an explanation of planation and contrasted the concept of the pediplain to that of the peneplain.

Peneplains are formed at the end of major tectonic cycles during the transition from the orogenic stage of development of the earth’s crust to the platform stage. Thick weathering mantles form within peneplains. When tectonic subsidences occur, peneplains may become buried by sedimentary strata; when uplifts occur, peneplains become raised, as in the case of the syrts of the Tien-Shan.

A. E. KRIVOLUTSKII

References in periodicals archive ?
The history of maturation of Estonian argillites begins in the Proterozoic era when the Jotnian sedimentation was followed by massive denudation with the formation of the sub-Cambrian peneplain and the first arenaceous and argillaceous sediments on it.
The flat surface of the Cape Breton Highlands is no longer considered a peneplain cut to sea level Seismic reflections are caused by velocity-density contrasts, not chemical-density contrasts.
Mulcahy MJ, Churchward HM, Dimmock GM (1972) Landforms and soils on an uplifted peneplain in the Darling Range, Western Australia.
l on a portion of the Eritrean highlands called the Asmara Plateau, a peneplain that ranges from approximately 2200 to 2500 m (Abul-Haggag 1961) (FIGURE 1).
Extending from beneath the Miller Pond Road sandstone, a level surface of low relief forms much of the eastern island and its archipelago, which may be interpreted as a relict Late Triassic peneplain that was beneath the Mesozoic strata.
1 The Upper Xingu basin can be generally characterized as a peneplain surrounded by topographically higher areas and is largely confined to the broad area (some 40,000 sq.
The topography varies from the steep slopes and scarp of the North Mountain, to the low relief valley floor, to the slopes and the raised peneplain of the South Mountain (Nelly et al.
Tectonically created elevations rise from this peneplain.