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<br />/" <br /> <br />FIGURE 3 <br />PHYSIOGRAPHIC DIVISIONS, PROVINCES, <br />SECTIONS, AND SUBSECTIONS <br /> <br /> <br />....!.2:.... <br /> <br />g/ <br /> <br />~ <br /> <br />~\ <br /> <br />~ <br /> <br />~ <br /> <br />. <br /> <br />t <br /> <br />SCALE I/II.~OO.OOO <br />o 100 <br /> <br />APPROXIMATE SCALE IN ~ILES <br /> <br />~ <br /> <br />~\ <br /> <br />BOUNDARY LEGEND <br /> <br />- PHYSIOGRAPHIC DIVISIONS <br />- PHYSIOGRAPHIC PROVINCES <br />- PHYSIOGRAPHIC SECTION <br />-'-'-'- PHYSIOGRAPHIC SUBSECTION <br /> <br />DASHED LINES REPRESENT BOUNDARIES POORLY KNOWN, <br />HIGHLY GENERALIZED OR NOT CLEARLY DEFINED <br /> <br />Throughout their length, the Rocky Mountains accumu- <br />late tremendous reserves of snow from which originate a <br />high percentage of spring and early summer stream flows. <br />The Great Plains province consists of a large area <br />between the Rocky Mountains on the west and the <br />Central Lowlands province on the east. The following <br />subdivisions are used for the purpose of describing the <br />province: (I) Glaciated Missouri Plateau, (2) Unglaciated <br />Missouri Plateau, (3) Biack Hiiis, (4) High Plains, (5) <br />South-Central Loess Hills section, and (6) Central Kansas <br />Rolling Plains. <br />The Glaciated Missouri Plateau is a broad expanse of <br />gently rolling topography extending eastward from the <br />Rocky Mountains across northern Montana and includ- <br /> <br />4 <br /> <br />ing those portions of North Dakota and South Dakota <br />lying north and east of the Missouri River. Stream dis- <br />section and drainage are not well established except in <br />areas adjacent to the Missouri River and along some of <br />its larger tributaries. Local drainage is chiefly into pot <br />holes, small intermittent lakes, and a few larger perma- <br />nent lakes. <br />The Unglaciated Missouri Plateau comprises the broad <br />roBing area west of the Missouri River in North .and <br />South Dakota. It also includes most of the eastern half <br />of Montana and northeastern Wyoming. Numerous small <br />hilly areas, buttes, and hogbacks have elevations higher <br />than the general level of the plains. While the area as a <br />whole is rolling and rather thoroughly dissected by <br />