Laserfiche WebLink
<br /> <br />........-.--.. <br />--"-'- <br /> <br />.-'-. <br /> <br />1 <br /> <br /> <br />NEVADA <br /> <br />CALIFORNIA <br /> <br />Flagstaff . <br /> <br />1I00W <br />I <br /> <br />I050W <br />I <br /> <br />WYOMING <br /> <br />Cheyenne. <br /> <br />Denver-40"N <br />. <br /> <br />CANYON I f <br />" DE CHELLY NAT'L MON, <br />I/'">~ I <br />. ~~I~""\ I C::, CHAC;:O CANYON <br />NAVAJO INDIA~~OiflE.LI' ~\ I NAT'L <br />RESERVATION . -.\.~. san~a Fe <br />("';1';.:: , <br />I ......6 . <br />L_lC'OA ____1--"\-1 <br />\" ~""~O"O I <br /> <br />-350N <br /> <br />ARIZONA <br /> <br />NEW MEXICO <br /> <br />o <br />. <br /> <br />50 <br />. <br /> <br />100 MILES <br />. <br /> <br />UNITED STATES.'-'- <br />r-------, <br />I MEXICO " <br />...J '. <br />--- -...,.-- " <br />( CHIHUAHUA " <br />\ <br /> <br />FIG. 1. The Colorado River Basin (redrawn from Hely 1969 and Fradkin 1981). <br /> <br />southwestern Wyoming, 2 735 km from the Gulf of <br />California. <br />The Colorado River Basin encompasses 632 000 km2 in <br />the United States and Mexico (Plummer 1983) and ranges <br />in elevation from sea level to above 4 000 m (Carlson and <br />Carlson 1982). It occupies one-twelfth of the land area of <br />the contiguous United States and is divided into upper and <br />lower basins for water management purposes. Sub-basins <br />and conditions in the basin were reviewed by LaRue (1916), <br /> <br />Sykes (1937), lorns et al. (1965), Bishop and Porcella <br />(1980), Carlson and Carlson (1982), Graf (1985), and Stan- <br />ford and Ward (1986a). <br />The Colorado River drainage spans three geologic <br />provinces: Rocky Mountains, Colorado Plateau, and Basin <br />and Range (Hunt 1974). Igneous and metamorphic rock <br />underlie headwater regions, but the river contacts marine <br />deposits containing salts and fine-grained sediments down- <br />stream (Miller et al. 1983). Major geologic strata were sum- <br /> <br />221 <br />