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Table 1. --SUDlDa.ry of the gtJologic formations and groups in the Upper Colorado River Basin and their physical. hydrologic, and chemical characteristics--Continued 1~99! Formation Hydro- Era~ System Series and geo- Physical characteristics Hydrologic characteris ti cs Chellical characterist ics them logic group unitl Horrison Contained in these fo~ations The Entrada, Navajo, and Wingate The chemical quality of water in Formation ar~ several very good sand- Sandstones are excellent sources the Entrada Sandstone and Glen -- i stone aquifers., t.he Eptreda of gt"ound ."et.et" for domestic and Canyon Group is generally good u SUIIlIDerville Sandstone and the Glen Canyon stock use. Well yields of ]00 to exce llent, and the db;- ~ Format.ion Group, which contain the galloos per minute are not un- solved-solids concentration is '" '" Navajo and Wingate Sandstones. common, and well yields of 350 generally less than 500 IRg/L. ~ Curtis The Entrada Sandstone is frolll gallons per ~inute are reported. Below depths of 2,000 feet the formation 50 to 500 feet thick and t.he Tbe Horrison and Summerville dissolved-solids concentration u Glen Canyon 8S tbick as 750 Formations are used locally for increases to about 1,000 mg/L. ~ Entrada feet in Colorado and up to stock watering and have well Data are sketchy for other 0 N Sandstone 2,000 feet thick in Utah. yields of only a few gallons formations. Water from the 0 '" The other Jurassic and Tri- per minute. Morrison and Summerville For- !;j Glen Canyon assic formationS typically mat ions has dissolved-solidg ~ Group consist of shale, s il t5 tone, concentratiops of greater than and interbedded lenses of l,OOOlllg/L. The Moenkopi For- u Navajo 9 sandstone. mation contains local beds of ~ 0 Sandstone gypsum. Data from one well N ",0 -- indicate water from the Chinle ~ Wingate and Hoenkopi Fonmations is .. u Sandstone more highly mineralized t.han ~ '" - th<lt from the Morrison and '" .. Chinle SUlllDerville Format ions. ~ j!: Formation Dolores Formation -- Moenkopi Formation .::~ State Bridge "'~ Formation ..x: