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J12 Vegetation The Jenkins site is located in vegetation type No. 6,: "Grasslands of the Foothills," as classified by the Soil Conservation Service, 1972 with a ribbon of riparian plants along Coal Creek, Figure J8. It appears, however, that some vegetation mixtures typical of SCS type 1, "Grasslands o~F the Plains," may intermix with no. b. Type no. 1 is dominated by glue grama grass and No. 6 by wheatgrass, needle grass, sand reed, 6luestem and blue grama. Woody plants observed along Coal Creek include cottonwood, boxelder, wild plum and hawthorne. The whole area has been grazed by livestock for many years; leading to a strong alteration of the original cover. Weeds are now abundant among the grasses, Figure J9, Weeds include bull thistle, chicory, dandelior~s, miners' lettuce, prickly pear cactus, yellow sweet clover and others. • The vegetation changes somewhat with soil type, Figure J10. The stonier, apparently lighter-textured soil 29-B has a more varied and weedier vegeta- tion than the less stony, apparently heavier soil 12-B. Any disturbed area that has reasonably good soil has revegetated rapidly and naturally, including piles of overburden, Figures J11 and J12. Exceptions include piles of clayey material taken from below the soil level and areas that have been covered with water for extended periods, Figure J13. Most of the plant species that pioneer on the exposed soils are weedy types. The following were identified growing on the overburden piles: bull thistle, Canada thistle, sunflower, dock, mullein, chicory, cockle burr, cheat grass, storks bill, ragweed, sweet clover, miners lettuce, bindweed, wild mustard, scurf pea, dandelion, snow-on-the-mountain, and cottonwood seedlings (near water). At least 5 species were not identified. The existing vegetation was not analyzed in detail for the following reasons: (1) It has been greatly altered Pram its natural condition,