Everything about The Interior Plains totally explained
The
Interior Plains is a vast physiographic region that spreads across the
Laurentian craton of North America. This area was originally formed when
cratons collided and welded together 1.9-1.8 billion years ago in the
Trans-Hudson orogeny during the
Paleoproterozoic.
Precambrian
metamorphic and
igneous rocks now form the basement of the Interior Plains and make up the stable nucleus of North America. With the exception of the
Black Hills of
South Dakota, the entire region has low relief, reflecting more than 500 million years of relative
tectonic stability.
The
Great Plains region of the
United States and
Canada falls within this area. The interior Plains were often covered by shallow inland sea. Sediments from the shield and the Rocky Mountains were deposited in these seas over millions of years. Eventually the sediments were compressed by the weight of the layers above into sedimentary rock. Part of the sedimentary rock deposited in these areas consists of coral reefs that formed close to the surface of seas during the Paleozoic era.
Geology and physiography
The Interior Plains are a vast
physiographic division encompassing 8 distinct physiographic provinces, the Interior Low Plateaus,
Great Plains, Central Lowland,
Mackenzie Delta, Manitoba Lowlands, Northern Boreal Plains, Prairie Grasslands, and the Southern Boreal Plains And Plateaux.
Paleozoic and Mesozoic
Throughout the
Paleozoic and
Mesozoic eras, the mostly low-lying Interior Plains region remained relatively unaffected by the
mountain-building tectonic collisions occurring on the western and eastern margins of the continent. During much of the Mesozoic Era, the North American continental interior were mostly well above sea level, with two major exceptions. During part of the
Jurassic, rising seas flooded the low-lying areas of the continent, forming the
Sundance Sea; in the
Cretaceous, much of the Interior Plains region lay submerged beneath the
Western Interior Seaway.
[
]Cenozoic
The Interior Plains continued to receive deposits from the eroding Rocky Mountains to the west and Appalachian and Ozark/Ouachita Mountains to the east and south throughout the era. The flatness of the Interior Plains is a reflection of the platform of mostly flat-lying marine and stream deposits laid down in the Mesozoic and Cenozoic eras.[Further Information]
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