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The Interior Plains physiographic area stretches across Canada and the United States, and the two governments each use a different hierarchical system to classify their portions. In Canada, the Interior Plains makes up one of seven physiographic areas included in the highest level of classification - defined as a "region" in that country.
USGS map colored by paleogeological areas and demarcating the sections of the U.S. physiographic regions: Laurentian Upland (area 1), Atlantic Plain (2-3), Appalachian Highlands (4-10), Interior Plains (11-13), Interior Highlands (14-15), Rocky Mountain System (16-19), Intermontane Plateaus (20-22), & Pacific Mountain System (23-25) The legend ...
The topography of the Precambrian rocks is very subdued, with barely 500 feet difference between the highest point and the lowest. ... The Interior Plains is a vast ...
The term "Great Plains" is used in the United States to describe a sub-section of the even more vast Interior Plains physiographic division, which covers much of the interior of North America. It also has currency as a region of human geography , referring to the Plains Indians or the Plains states .
Erosional plains have been leveled by various agents of denudation such as running water, rivers, wind and glacier which wear out the rugged surface and smoothens them. Plain resulting from the action of these agents of denudation are called peneplains (almost plain) while plains formed from wind action are called pediplains .
Each of the three divisions is distinguished by topography and geology. [1] The other physiographic regions are the Canadian Shield, the Hudson Bay Lowlands, the Interior Plains, the Cordillera, the Great Lakes–St. Lawrence Lowlands, and the Appalachian Uplands. [2]
The northernmost reaches of the Canadian Prairies are less dense in population, marked by forests and more variable topography. [3] If the region is defined to include areas only covered by prairie land, the corresponding region is known as the Interior Plains. [4]
The terrain of the Southeastern Plains is dissected, rolling to smooth plains.The Cretaceous sands, silts, and clays of this region contrast geologically with the older metamorphic and igneous rocks of the Piedmont ecoregion, and with the Paleozoic limestone, chert, and shale of the Interior Low Plateaus ecoregion.