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<br />Moenkopi Formation: Lower part of formation deposited in shallow <br />marine waters. Gypsum near the top indicates partial or complete isola- <br />tion from the open sea, perhaps in a hot, dry climate. The top of the <br />formation has ripple marked sandstone, gypsum and indications of lagoon <br />and deltaic conditions in a dry climate along the margin of a slowly <br />withdrawing sea. <br /> <br />Kaibab Limestone: Formed in a shallow sea in a generally arid <br />climate as indicated by gypsum layers. <br /> <br />Supai Formation: Continental and probably near-shore conditions <br />with effective dry seasons as evidenced by the red sandstone and gypsifer- <br />ous shale. <br /> <br />Callville Limestone: Shallow inland sea formations. <br /> <br /> LEGEND <br /> IQneous Rocks .. <br /> t <br />I, vocanics. gneiss, <br /> schist and granite <br /> Sedimentary Rocks , <br />C. CENOZOIC ./ <br /> , <br /> Tertiary I <br /> MUddy Creek Fm. r- , <br /> -.... , <br />M. MESOZOIC /' , , / <br /> Cretaceous '-./ / <br /> / <br /> Jurassic ( f) , <br /> San Rafel Group , <br /> Glen Canyon Group , <br /> Triassic <br /> Chinle Fm, <br /> Shinarump conglomerate <br /> Moenkopi Fm, <br />p, PALEOZOIC C <br /> Pennian P <br /> Kaibab limestone <br /> Coconino Fm. <br /> Pennesylvanian <br /> Callville limestone <br /> Mississippian <br /> Redwall limestone <br /> Cambrian <br /> dolomite and quartzite <br /> <br /> <br />. <br />Overton <br /> <br /> <br />Figure 4 <br /> <br />n()(.;:63 <br /> <br />o , 10 mll.. <br /> <br />ScaJ.. <br /> <br />GEOLOGIC MAP <br /> <br />Virgin Valley Subevaluation Unit <br />Arizona, Nevada. Utah <br /> <br />of the Virgin River Unit <br />Colorado River Bas;n Salinity Control Program <br /> <br />USOA-SCS <br /> <br />8 <br />