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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 Highland Rim is a physiographic section of the larger Interior Low Plateaus province, which in turn is part of the larger Interior Plains physiographic division. [1] Most of the Highland Rim is located in U.S. EPA Ecoregion 71, Interior Plateau, which is a part of the Eastern Temperate Forest.
During much of the Mesozoic Era, the North American continental interior was mostly well above sea level, with two notable exceptions. During part of the Jurassic (208-144 million years ago), rising seas flooded the low-lying areas of the continent. Much of the Interior Plains eventually lay submerged beneath the shallow Sundance Sea. [16]
Interior Highlands: Ozark Plateaus: Springfield-Salem Plateaus: Boston Mountains: Ouachita province Arkansas Valley Ouachita Mountains: Interior Plains: Interior Low Plateaus Highland Rim section: Lexington Plain Nashville Basin: Great Plains: Missouri Plateau, Glaciated: Missouri Plateau, Unglaciated: Black Hills: High Plains: Plains Border ...
Alabama spans three continental geologic provinces as defined by the United States Geological Survey, the Atlantic Plain, Appalachian Highlands, and Interior Plains. [ 1 ] [ 2 ] The Geological Survey of Alabama breaks these provinces down into more specific physiographic provinces.
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This area now forms much of the Interior Plains and the slope of the Appalachians below the mountains proper. [7] This area has been covered by a shallow inland sea, which became the site of deposition for most of the overlying sedimentary rock. [citation needed] The sea receded as the continent rose becoming covered by stream, lake, and wind ...