Laserfiche WebLink
<br /> <br />)):325 <br /> <br />38'45 <br /> <br />106'15 <br /> <br />,~ <br />"--- 50 -' \\oO~--' <br />~~ $"/.:.....- <br />~ <br /> <br />I\: <br /> <br />38"30'.- <br /> <br />10l3"00' <br /> <br />107"45' <br />-~ <br /> <br />- <br />,Vo't~ <br /> <br />" <br />,. <br />)t <br />, <br />, <br /> <br /> <br />50 <br />. ........ <br /> <br />DESC1UPTlON Of ~ UNITS <br />Qt.iA TER:-;ARY AUU\IIL'.\f <br /> <br />_ QliArtRNARY TERRACE DlPOSlTS <br /> <br />_ MANCOS SHALE Of l'PPER CRETACEouS AGE <br /> <br />_ ROCKS Of' lQV.t.RCRETACEOl.'SAND Jl,IRASSICAGE <br /> <br />(j.ENERAUZro E.'\TlJI,.'T <br />OF IRRIGATED AREA <br /> <br />38'15 L <br /> <br />o <br /> <br />'5O~ <br />~Colon. <br /> <br />_1 <br /> <br />5 <br /> <br />10 MilES <br /> <br />o 5 10 ',LO'_lfrE<:tS <br />Figure 4. Generalized surficial geology of the Uncompahgre Project <br /> <br />The Mancos Shale of Upper Crelaceous <br />age underlies almosl all of the Grand Valley. <br />underlies the easlem one-half and part of the <br />western one.half of the Uncompahgre Project area <br />(figs. 4, 5A), and outcrops in many areas lhroughoul <br />western Colorado and Utah. The formation ranges <br />in thickness from 2.000 to 3.000 ft and consists <br />of massive. fossiliferous marine shale thai contains <br />inlerbedded sands[one. sihslone. and \'oJcanic-ash <br />layers. The Mancos Shale is the laleral equivalenl <br /> <br />of the Niobrara Formation. Cody Shale. and Pierre <br />Shale in Monlana. Nebraska. South Dakola. and <br />Wyoming. <br />The Mancos Shale is a regressive prodelta- <br />plume comple~ genetically relaled to Ihe deltaic <br />systems acti'"e along the western interior seaway <br />of Cretaceous age and is divided into the lower <br />shale member. the Ferron Sandslone Member <br />(or the Juana Lopez Member), the Mancos B <br />Member, and the Buck Tongue Member (Cashion. <br />1973; Gill and Hail. 1975: Cole and Young. 1991). <br /> <br /> <br />INTROOUCTION 9 <br />