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<br />. <br /> <br />~ <br /> <br />~J <br />n <br /> <br />The lava-capped Grand Mesa marks the southern limit of this subdivision. <br /> <br />The Canyon Lands subdivision is south of the Uinta Basin. The Canyon <br /> <br />Lands of western Colorado are not typical of this subdivision as the <br /> <br />Gunnison, Colorado, and Uncompahgre Rivers have formed broad valleys in <br /> <br />the sedimentary beds as compared to the narrow deeply entrenched canyons <br /> <br />they have created further west. Several large plateaus are defined by the <br /> <br />wide river valleys--the Uncompahgre, ~ and Mesa Verde Plateaus, <br /> <br />The third subdivision is the Navajo Section which occupies a very small <br /> <br />portion of southwestern Colorado along the headwaters of the San Juan <br /> <br />River. Here sandstone is the predominant rock type with lesser amounts <br /> <br />of shale.' The beds dip slightly, and this, coupled with the erosion of an <br /> <br />arid climate, have created an abundance of mesas, cuestas, rock terraces, <br /> <br />retreating escarpments, and dry washes. <br /> <br />0357 <br />