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<br />FIGURE 2 <br /> <br />PHYSIOGRAPHIC DIVISIONS, PROVINCES, <br />SECTIONS, AND SUBSECTIONS <br /> <br /> <br />~ <br /> <br />gl <br /> <br />~ <br /> <br />~ <br />~I <br /> <br />~ <br /> <br />. <br /> <br />t <br /> <br />SCALE 1/'1,500,000 <br />o 100 <br />APPROXIMATE SCALE I.... IoIllES <br /> <br />~ <br /> <br />g\ <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 />SOILS AND VEGETATION <br /> <br />Natural soils in the Missouri Basin -are closely related <br />to zones of climate and vegetation. Most have developed <br />under grass cover, with the exception of those in the <br />Rocky Mountains and the Ozark Plateaus. Mountain <br />complex soils are in the coniferous forests of the western <br />perimeter of the basin, the Black Hills, and the Ozark <br />Plateaus. Brown soils are in the semiarid short-grass <br />plains of eastern Montana and Wyoming and north- <br />eastern Colorado. Desert and sierozem (light-gray) soils <br /> <br />6 <br /> <br />occupy intermountain basins and high dry plateaus <br />almost exclusively in Wyoming. Chestnut (light-brown) <br />soils occur in the mixed tall and short-grass areas of <br />eastern Montana and Wyoming; western North Dakota, <br />South Dakota, and Nebraska; and northwestern Kansas. <br />Chernozem (dark-brown) soils, developed under tall and <br />mixed grasses, extend across most of eastern North <br />Dakota and South Dakota and through central Nebraska. <br />The brunizem (black) and some gray-brown podzolic <br />soils occur in southwestern Minnesota, southeastern <br />South Dakota, eastern Kansas and Nebraska, as well as <br />