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<br />PHYSIOGRAPHY AND HYDROGRAPHY OF WYOMING
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<br />A knowledge of the physiography and hydrography of a region is essential to
<br />understanding the distribution of fishes. In Wyoming, altitudinal distribution is
<br />particularly important.
<br />Broadly speaking, the surface features of the state may be classified as
<br />mountains, plains, river valleys or basins, and a single, closed basin, the Great Diy-ide
<br />Basin. The major mountain ranges include the Teton, Absaroka, Wind River, Big
<br />Horn, and the three subdivisions of the Medicine Bow Mountain Range, the
<br />Laramie, Snowy and Sierra Madre ranges. Lesser uplifts include the Black Hills in
<br />the northeastern corner of the state, the Ferris, Rattlesnake, Seminoe, Shirley, and
<br />Owl Creek mountains in central Wyoming, and the Wyoming Range in western
<br />Wyoming. The Uinta Range, in the extreme southwestern corner of the state is
<br />mostly in Utah.
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<br />Fig. 4. Base map of Wyoming showing streams and counties.
<br />
<br />About one-fourth of the area of Wyoming is mountainous. A major part of the
<br />remainder of the state is rolling plains, with a predominant vegetation of sagebrush
<br />in west and central Wyoming and of short grass in the east. The lower elevations in
<br />the state are associated with the river systems outlined below, particularly near the
<br />point where a river leaves the state.
<br />
<br />9
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