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The Interior Low Plateaus lie at the southern edge of the glacial boundary. Unlike the till plain to the north, the underlying bedrock is generally close to the surface, and the topography of an area depends on how resistant the underlying bedrock is to erosion. More resistant sandstones have resulted in hillier areas such as the Norman Upland ...
Interior Lowlands is a description of a large region of mainly flat land and may refer to: Interior Lowlands of North America, see Geography of North America and Geography of the Interior United States; Interior Lowlands of Australia, see Geography of Australia; Interior Lowlands Located west of the Appalachian Highlands and east of the Great ...
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 ...
Age of the bedrock underlying North America, from red (oldest) to blue, green, yellow (newest). Seventy percent of North America is underlain by the Laurentia craton, [5] which is exposed as the Canadian Shield in much of central and eastern Canada around the Hudson Bay, and as far south as the U.S. states of Michigan, Wisconsin, and Minnesota.
The Dissected Till Plains is a sub-unit of the Central Lowlands in the Interior Plains of North America. It is centered on the Iowa-Missouri state line. The eastern border is the Mississippi River and bounded on the south by the Missouri River Valley across central Missouri. Its western boundary is about 100 miles (160 km) west of the Missouri ...
It is a gigantic trough, including a chain of valley lowlands, and the central feature of the Appalachian Mountains system. The trough stretches about 1,200 miles (1,900 km) from Quebec in the north to Alabama in the south and has been an important north–south route of travel since prehistoric times.
(Click to zoom) See legend below This is the legend for the North American geological map above. Geologic map of North America. The geology of North America is a subject of regional geology and covers the North American continent, the third-largest in the world. Geologic units and processes are investigated on a large scale to reach a ...
The standard reference is The Deciduous Forest of Eastern North America. [4] The adjoining forests in Canada are generally referred to as the Mixedwood Plains Ecozone or the Great Lakes-St.Lawrence Forest Region. 32 Texas Blackland Prairies; 33 East Central Texas Plains; 34 Western Gulf Coastal Plain; 36 Ouachita Mountains; 37 Arkansas Valley