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1 <br />1 <br />t <br />1 <br /> <br />1 <br />1 <br />1 <br />1 <br />t <br /> <br />1 <br />1 <br /> <br />1 <br /> <br /> <br />1 <br />the high percentage of cobbles found throughout their <br />profiles, which makes tilling nearly impossible. <br />Soils on the second terrace range from reddish-brown <br />loams with basalt cobbles to saline grey-brown clays where <br />Mancos Shale has been eroded to form terraces. As one <br />progresses further downstream, soils of these terraces <br />become more and more salt affected. However, they are <br />generally irrigated and grow grasses with adequate yields <br />(although they are not as high yielding as the cobbly loams <br />of the mudflow fans and third and fourth terraces). <br />Soils of the Mesaverde Group are shallow to deep clays <br />over shale and shallow loams to sandy clays over sandstone. <br />They are generally not irrigated. They are limited in their <br />utility by shallowness, rockiness, and slope. <br />Soils on the Mancos Shale are moderately deep to <br />shallow clays with high salt contents. All Mancos Shale <br />soils in the study area are severely limited in their <br />agricultural capabilities by steep slopes. <br />Subirrigation. The basic approach to determining the <br />presence of subirrigation in the Ward Creek and Williams <br />Creek valleys was to undertake a field survey which <br />consisted of an evaluation of vegetation and the measurement <br />of water levels in piezometers and wells completed in the <br />alluvium. <br />85 <br />1 <br />