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Era <br />System <br />Stratigraphic Unit <br />Thickness <br />(feet) <br />Physical Characteristics <br />Hydrogeologic Unit <br />Hydrologic <br />Characteristics <br />Cenozoic) <br />Quaternary <br />Alluvium <br />0 - 100 <br />Alluvial sands and <br />gravels, loess, colluvium, <br />windblown sands <br />Alluvium <br />Locally yields large <br />quantities for domestic, <br />stock, and municipal <br />aiozosOJA <br />Upper <br />Cretaceous <br />Mancos Shale <br />1,000 - <br />5,000 <br />Shales interbedded with <br />minor sandstone <br />Cretaceous <br />Confining Bed <br />Confining unit; none <br />Lower <br />Cretaceous <br />Dakota Sandstone <br />0 200 <br />Fine to coarse - grained <br />cross- bedded sandstone <br />Mesozoic sandstone <br />aquifer <br />Yields some water, stock <br />and domestic <br />Burro Canyon <br />Formation <br />0 250 <br />Conglomerate, sand- <br />stone and shale <br />yields water to springs <br />Upper <br />Jurrasic <br />Morrison <br />Formation <br />Brushy Basin <br />Member <br />400 - 500 <br />Shales interbedded with <br />minor sandstone <br />None <br />Saltwash <br />Member <br />300 <br />Medium grained <br />sandstone interbedded <br />with red shale <br />Yields small quantities, <br />stock and domestic <br />Upper <br />Middle and <br />Lower <br />Jurassic <br />Summerville <br />Formation <br />Entrada Sandstone <br />Carmel Formation <br />Navajo Sandstone <br />Kayenta Formation <br />Wingate Sandstone <br />0 120 <br />Shales interbedded with <br />minor sandstones <br />None <br />15 - 170 <br />Buff to grayish-white <br />cross - bedded sandstones <br />Yields water <br />0 - 40 <br />Siltstone and mudstone <br />interbedded with fine- <br />grained sandstone <br />None <br />0 - 125 <br />Fine - grained, cross <br />bedded quartz sandstone <br />Small to moderate amount <br />from fractures, stock and <br />domestic <br />0 - 200 <br />Sandstone interbedded <br />with siltstone and thin- <br />bedded shale <br />Yields little to no water <br />0 -400 <br />Medium grained, poorly <br />cemented, cross - bedded <br />sandstone <br />Yields water to numerous <br />springs <br />Upper <br />Triassic <br />Dolores Formation <br />Chinle Formation <br />150 - 230 <br />Pink to red mudstone and <br />fine- grained sandstone. <br />Not present in all areas <br />Mesozoic -Upper <br />Paleozoic Confining <br />Bed <br />Not water bearing <br />0 - 500 <br />Shales, siltstones, <br />interbedded with minor <br />fine- grained sandstone <br />Yields small quantities <br />where fractured, stock and <br />domestic <br />Lower <br />Triassic <br />Moenkopi <br />Formation <br />0 480 <br />Mudstone interbedded <br />with minor sandstone <br />Yields small quantities <br />where fractured, stock and <br />domestic <br />I Paleozoic <br />Permian <br />Cutler Formation <br />0 - 3,500 <br />Fine grained sandstone <br />interbedded with minor <br />conglomerate and <br />mudstone <br />Yields small quantities <br />where fractured, stock and <br />domestic <br />Pennsylvanian <br />Hermosa <br />Formation <br />0 - 3,900 <br />Shales, limestones, salt, <br />and gypsum; includes the <br />Paradox Member <br />Confining salt beds <br />None <br />Mississippian <br />Leadville <br />Limestone <br />20 - 100 <br />Massive to thinly <br />laminated, gray buff and <br />yellow limestone <br />Lower Paleozoic <br />carbonate aquifer <br />Transmits saltwater through <br />fractures <br />Devonian and <br />Cambrian <br />Ouray, Elbert, and <br />Ignacio Formations <br />0 150 <br />Limestone, shale, <br />dolomite; Ignacio is a <br />quartzite <br />JD -6 Mine Environmental Protection Plan <br />Table 20. Hydrostratigraphic Units of the Paradox Basin (Topper, et al., 2003) <br />35 <br />4148A.120927 <br />Whetstone Associates • <br />