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<br /> <br />.v; <br /> <br />"".:l <br />:::J <br />(\) <br />. ,~_) at the expense of the old. In the Cisco area (Fig. 18) where Utah State <br />.:") University range students have studied the plant assemblages on at least <br />t1t three successive pediment surfaces, they have also gained insight, into <br />the control of runoff. How this knowledge might be utilized for <br />long-range control of water quality in the Colorado River has been <br />discussed in other symposium papers. <br /> <br /> <br />1m portant as control of point sources of contamination along the <br />river may be, and they are important, and as productive as better <br />management of irrigated areas along the river may be in reducing the <br />salt load, it seems well to bear in mind the basic geologic nature of the <br />problem, which relates to one of the earths most interesting rivers <br />draining an area of unusual geologic interest and unmatched scenic <br />beauty. <br /> <br /> <br /> <br />,.,,". <br /> <br />..',', <br /> <br />REFERENCES <br /> <br /> <br />Bass. N. W. and S. A. Northrup. 1963. _Geology of Glenwood Springs Quadrangle and <br />Vicinity Northwestern Colorado. USGS Bull. 1142-J. ' <br /> <br />Bassler, Harvey. and J. B. Reeside, Jr. 1922. Oil Prospects in Washington County, Utah. <br />USGS Bull. 726.C. <br /> <br />Bradley. W. H. 1964. Geology of the Green River Formation and Associated Eocene Rocks <br />in Southwestern Wyoming and Adjacent Parts ,of Colorado and Utah. USGS Prof. <br />Pa.per 496.A. <br /> <br />Cater. F. W. 1970. Geology of the Salt Anticline Region in Southwestern Colorado. USGS <br />Prof. Paper 637. <br /> <br />Cooley. M. E. and others. 1969', Regional Hydrogeology 'of the Navajo and Hopi Indian <br />Reservations. Arizona. New Mexico and Utah. USGS Prof. ,Paper 521-A. <br /> <br />Dane. C. H. 1935. Geology of the Salt Valley Anticline and Adjacent Areas, Grand, County. <br />Utah. USGS Bull. 863. <br /> <br /> <br />Gilluly, James, and John B. Reese, Jr. 1927. Sedimentary Rocks of the San Rafael Swell <br />and Some Adjacent Areas in Eastern Utah. USGS Prof. Paper 150, p. 61-110. <br /> <br />Metzger, D. G. 1961. Geology in Relation to Availability of Water Along the South Rim <br />Grand Canyon National Park, Arizona. USGS Water-Supply p'aper 1475-C. <br /> <br />Repenning, C~ A. and others. 1969. Stratigraphy of the Chinle and Moenkopi Formations. <br />Navajo and Hopi Indian Reservations, Arizona, New Mexico and Utah. USGS Prof. <br />Paper 521-B. <br /> <br />17 <br /> <br /> <br />',".-."".,,;,",-- <br /> <br />'".' ,,-;,-~,^,H _ <br />