Laserfiche WebLink
<br />Table I. --Summal'fj of the qeolCX]ic formations and groups in the Upper Colorado River Basin <br />and their physical, hgdrologic, and chemical characteristics--Continued <br /> <br />egg! <br /> <br /> Formation Hydro- <br />Era- System Series and geo- Physical characteristics Hydrologic characteristics Chemical <br />them logic cba t:'3cteri sties <br /> group unit1 <br /> The Precambrian rocks are Th. rocks are nearly impermeable. Th. water generally has a v.ry <br /> igneous and metamorphic roc ks except where fractured Or weath- small dissolved-solids concen- <br /> which are mainly granite. ered. Yields of 1 to 5 gallons tration, less than 100 mg/L, <br />~ Isneous schist, and gneiss. These per minute He commont l;Jut yields Di5ch~rge to streams from <br />... and meta- rocks make up the high moun- greater than 10 8allons p.r min- tbese rocks is large. and they <br />'" <br />~ morphic II tain ranges which form the ute are rare. The potential contribute a la rge salt load. <br />u rocks h.eadwaters of most. of the recharge to these rocks are very <br />~ major streams. large since tbey are exposed <br /> mostly io h.igb., mountainous <br /> areas that receive great amounts <br /> of precipitation. Discharge is <br /> to streams. <br /> <br />lNumbers in this column correspond to the numb~red area5 on figure 2. <br /> <br />~ <br />~ <br />