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The northern section of the Great Plains, north of latitude 44°, including eastern Montana, north-eastern Wyoming, most of North and South Dakota, and the Canadian Prairies, is a moderately dissected peneplain. The strata here are Cretaceous or early Tertiary, lying nearly horizontal.The surface is shown to be a plain of degradation by a gradual ascent here and there to the crest of a ragged escarpment, the escarpment-remnant of a resistant stratum.The weaker uppermost strata have been eroded down to the level of the plains where their upturned edges are evenly truncated.The next following harder strata have been sufficiently eroded to disclose the core of underlying igneous and metamorphic crystalline rocks in about half of the domed area.A significant exception to the rule of mature valleys occurs, however, in the case of the Missouri, the largest river, which is broken by several falls on hard sandstones about 50 miles (80 km) east of the mountains.This peculiar feature is explained as the result of displacement of the river from a better graded preglacial valley by the Pleistocene ice sheet.The Great Plains (sometimes simply "the Plains") is the broad expanse of flat land (a plain), much of it covered in prairie, steppe, and grassland, that lies west of the Mississippi River tallgrass prairie in the United States and east of the Rocky Mountains in the U. The Canadian portion of the Plains is known as the Prairies. It embraces: The region is known for supporting extensive cattle ranching and dry farming.
Although the altitude of the plains increases gradually from 600 or 1,200 ft (370 m) on the east to 4,000–5,000 or 6,000 feet (1,800 m) near the mountains, the local relief is generally small.They rise like a large island from the sea, occupying an oval area of about 100 miles (160 km) north-south by 50 miles (80 km) east-west.At Black Elk Peak, they reach an altitude of 7,216 feet (2,199 m) and have an effective relief over the plains of 2000 or 3,000 ft (910 m) This mountain mass is of flat-arched, dome-like structure, now well dissected by radiating consequent streams.The northern plains are interrupted by several small mountain areas.The Black Hills, chiefly in western South Dakota, are the largest group.
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It covers much of Alberta and southern Saskatchewan, and a narrow band of southern Manitoba.