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• Table 7-1. Description of Geolo~ts and Their Hydrologic Properties, Yeast Mining Area (Adapted Irom Brogden and Giles, 1977) • Maximum Thickness System Series Geologic Unit Symbol (feet) Physical Characteristic Hydrologic Characteristics Dark-gray to bluish, honagenous, marine Reported well yields are less than 5 gal/ shale with several thin Interbedded min. Water is predominantly a calcium sandstones and calcareous concretions, bicarbonate type. Dissolved-solids Lewis concentration ranges from 272 to 4,230 Shale Kls 1,900 mgA. Water may mntaln concentrations of Iron, manganese, nitrate, selenium, and sulfate In excess of U.S. Public Health Service (1962) standards for drinking Upper water. Cretaceous Sandstone, light-brown tograyish-white, Reported well yields are as much as 100 with Interbedded gray carbonaceous shale, gal/min, but average less than 10 gaVmin. mat, and clinker beds. The coal beds Fbwing wells can be found in most stream Williams are of economic Importance end more valleys and In areas where sandstones are Fork Kw 2,100 numerous than those o1 the Iles Formation. overlain by Lewis Shale. Water is Formation The very line to line-grained, light-gray predominantly calcium and sodum ° to white, massive, crossbedded Twentymile bicarbonate types. Water In contact with Sandstone Member Is a prominent ledge- coals may be a calcium sulfate type and n °o a~ „ forming sandstone about 800 to 9001eet mntaln fluoride, iron, manganese, °~' ~ above the base of the formation. selenium, and sulfate in excess o} U.S. d ~ Interbedded light-brown to white, massive, Public Heatlh Service (1962) standards for ..~ ~ fine-grained, ledge•lorming sandstone, drinking water. Dissolved-solids concen• brown to blackharbonaceous shale, sandy tratlon ranges from 334 to 1,460 mg/1 and Iles shale, and coal. The Trotn Creek Sand- averages 746 ngA. Hydraulic-conductivity Formation Ki 1,500 stone Member, a 50- to 100-h thick, tight- values for Iractured sandstones range Irom brown tolight-grey, tine-grained, massive 3.7 to 26 fVd. sandstone, Is located at the top of the formation. Lightyray to dark-gray lossililerous marine Reported well yields are less than 5 gaVmin. shale with Interbedded sandstones and lime- Water Is predominantly a calcium lvcar- stones. The sandstones are generally thin bonate type. Dissolved-solies concentration Upper bedded, fine grained, tan, and losslliferous, ranges from 338 to 2,590 mg/I. Water may and Mancos and form resistant ledges In the basal and contain comm~trations of chloride, Ouoride, Lower Shale Km 5,300 upper parts of the formation. The overall Iron, and manganese in excess of U.S. Cretaceous area omupled by the Mancos Shale is Public Heatlh Service (1962) standards for characterized by a rolling hummocky drinking water. topography. N