1988-04-11_PERMIT FILE - C1981008A (9)

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Table ?-1. Summary of the Geologic Units and Hydrologic Character System Geologic Unit Thickness Physical Character Hydrological Character puaternary Valley Filled 20-140 Clay, sand, gravel debris, generally Capable of yielding 5 to 100 gFah, lost having a Deposits grading from coarse materials at hydrological o=v=ticn with the stream. Water the head waters to finer materials commonly is hard with varying amounts of Ca, darn stream. Mg, HOCY , and SO4. It is also generally more mineralized than adjacent stream . cretaceous Dakota Sandstone Up to 3000 Light to dark colored sandstone with Yields up to 400 gpm but for the most part much (including Biro interbeds of shale and coal. lose. The water is commonly saline. The water � Canyon Formation) comuonnly Ca-14g-SO4 or Na H003. -2 Jurassic Morrison Formation 250-600 Varicolored siltst o ne and mudstone Source of water to stock and dcmestin Nalls v with beds of sandstone and locally. limestone. Curtis and Summer- 50-200 Crossbedded sandstone, limestone. Source of water for stock and domestic walls. villa Formations varicolored siltstone and mndstone. Entrada Sandstone 50-200 Pine-grained sandstone. mostly Source of water for stock and domestic wuelI crossbedded. Locally yields more than 25 gpm. Triassic Glen Canyon and As thick Sandstone, lenses of limestone, and Sandstones are sources of water to stock and Wingate Sandstones as 500 varicolored siltstone and mid- domestic wells. and older Triassic stone. !locks Permian and Permian and Pennsyl- As thick Shale, limestone, dolomite, con- Sandstone beds cc manly yield saline water. �. Pennsylvanian vanian rocks as 13,000 glomerate, and sandstone. Not generally considered a source of water to well CDs. n o Mississippian Leadville Limestone 50-200 Limestone, dolomite, sandstone, Yields water from fractures and solution and chart. openings. Yields as much as several thousand gpm locally. Elkta nt of large yield potential �w is unknown. 00 Devonian Pre-Mississippian As thick Dolomite, limestone, quartzite, Yields small supplies of Ordovician rocks as 2,500 sandstone, conglomerate, shale, potable water at depths oong less than 2,000 feet. Cambrian and chert. Precambrian Precambrian rocks Granite, schist, gneiss, and Wells derive water from fractures and weathered pegmatite dikes. material. Source of water for damestic and stock supplies; yields are generally less than 10 cmn.