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VEGETATION <br />Vegetation Types <br />The Chambers Pit site is located on terraces above the Eagle River <br />and is characterized by two basic landforms. Most of the site has <br />been modified into level hayfields and pastures which are irrigated <br />via a series of small ditches. The remainder of the site consists <br />of rather steep banks and gullies which separate the terrace levels. <br />The vegetation on the site is composed of six types (see Vegetation <br />Map). Hayfields and pastures and disturbed areas occur on the flat <br />areas. Cottony;ood woodlands, juniper woodlands, big sagebrush shrub- <br />lands and meadow:. occur on the steep banks and along the Eagle River. <br />These last four types are native vegetation types which at one time <br />were probably more abundant and have been reduced in areal extent <br />as a result of ranching activities on the site. Each of the six <br />types is described briefly below: <br />Hayfields and Pastures <br />The hayfields and pastures are restricted to the flat areas on the <br />site. These areas are irrigated and are used for production of <br />alfalfa and various pasture grasses. Common species include <br />alfalfa (Medicago sativa), smooth brome (Bromus inermis), western <br />wheatgrass (Agropyron smithii), and orchardgrass (Dactylis glomerata). <br />Disturbed Areas <br />The vegetation on disturbed areas consists mostly of cheatgrass <br />(Bromus tectorum) and several weedy mustard species (Lepidium per- <br />foliatum, Descurainia pinnata and Sisymbrium altissimum). The <br />disturbed areas occur around ranch buildings and include roadways, <br />J-1 <br />