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0 <br />E <br />Another interpretation is that soil heaving due to wetting and drying of swelling clays (this <br />is a vertic soil, see below) has led to distortion of what originally were level contacts. <br />Note however, that such shrink -swell distortions are generally more jagged in profile, <br />and less smoothly undulant (Photos 1 and 2). <br />It is also of note that the surface slopes away from the uplands across the axis of the <br />valley to a low point then rises again (Figure 3), consistent with interpretation of the site <br />as a coalescence of low slope flow debris. <br />In sum, the material may be in one sense alluvial (as well as colluvial) but does not <br />appear to be stream -laid alluvium. It might be alluvium that has experienced heaving <br />typical of vertic soils. <br />Soil Classification and Characteristics <br />Soils of the valley bottom are mapped in the unpublished Routt Co. Soil Survey as <br />Dresher fine sandy loam. Dresher is a fine smectitic frigid Vertic Natrustalf. The <br />presence of substantial salt content is quite apparent in the profile and representative of <br />this soil series (Photos 1 and 2, attached soil series description). <br />E <br />Photo 2. Scotchman's Gulch profile exposed along current channel <br />