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<br />I l'. .., ~,. <br />"i v ~ '- <br /> <br />subsequent erosion. Glacial activities 1ert moraines, pro- <br /> <br />minent terrace deposits and evidence or changes in stream <br /> <br />courses. (See Figure 7, Topogra;)hy North Side Collection <br /> <br />System.) The co11ec tion system will be in the northern part <br /> <br />or the Sawatch Range, structurally a part or the southern <br /> <br />Rocky Mountains physicgraphl.c province at an elevation or <br /> <br />about 10,000 reet. <br /> <br />Pine, spruce and aspen thickly rarest the area, and trees <br /> <br />tend to stab1ize the overburden and help to restrict snow- <br /> <br />slides. Valleys in the area are steep-sided and broad- <br /> <br />bottomed. High in these valleys, "here the collection systcoms <br /> <br />are being located, glacial debris is spE!rse due to the pre- <br /> <br />dominant erosion rorces that prevailed during the rormation <br /> <br />or the valleys. Remnants of l'l.teral moraines ere rcunel <br /> <br />intermittently en high valley slopes. A mile or more down- <br /> <br />stream from the collection system, ground ~nd lateral mcraiL~ <br /> <br />are lOe11 developed an~. glacial out>lash underlies the broad, <br /> <br />flat meadolOs. <br /> <br />c. Vegetation.--Much of the area or the collection system is <br /> <br />coniferous forest of the subalpine anrl montane life Z0nes; <br /> <br />anJ subalpine zone consistine of ~rr area from timberline <br /> <br />d01-1I\Ward about 2,000 feet "ith clImax forests or Eni!elmann <br /> <br />spruce and subalpine fir. The most conspicuous succession <br /> <br />22 <br />