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Whirlwind Mine Groundwater Characterization Report <br /> • Navaio Sandstone: Triassic (?)to Jurassic: Regionally 0 to 740 ft thick. Consists of <br /> light-gray to pale- brown massive medium-to fine-grained sandstone of eolian origin, <br /> and some local thin, hard, gray limestone beds. The lower third weathers to a cliff <br /> (Doelling, 2002). <br /> • Kayenta Formation: Triassic: Regionally 100 to 300 ft thick. Consists of red-brown, buff, <br /> lavender- gray fine-to coarse-grained sandstone, with medium-to thick-bedded <br /> sandstone; local white to dark-brown beds; interbeds of siltstone, shale, and <br /> intraformational conglomerate and limestone; forms thick ledges. The upper third may <br /> form red, slope-forming siltstone. The lower contact is a scoured surface in the Wingate <br /> Sandstone (Doelling, 2002). <br /> • Wingate Sandstone: Triassic: Regionally 250 to 450 ft thick. A light-brown, orange- <br /> brown, weathered dark-brown to white massive, nearly homogeneous, well-sorted, <br /> fine-to very fine-grained, cross-bedded sandstone; of eolian origin. The Wingate <br /> Sandstone forms the prominent cliffs of Lumsden and John Brown Canyons and forms <br /> an abrupt contact with the underlying Chile Formation (Doelling, 2002). <br /> • Chinle Formation: Triassic: Regionally 0 to 900 ft thick or more. Consists of bright red <br /> and red-brown mudstone and siltstone and sandstone, some mottled, with lenses of <br /> limestone-pebble conglomerate; irregular bedding compared to the underlying <br /> Moenkopi Formation. The Chinle forms a steep slope with the Moenkopi under the <br /> base of the massive Wingate Sandstone cliffs (Doelling, 2002). <br /> • Moenkopi Formation: Triassic: Regionally up to 1,300 ft thick. Consists of evenly <br /> bedded red-orange, light chocolate- brown and medium-brown sandstone, silty <br /> sandstone, and minor siltstone and conglomerate. The formation has been divided into <br /> two or four members (Doelling, 2002). Gypsiferous sandstone and small gypsum beds <br /> are common. <br /> • Cutler Formation: Permian: Regionally as much as 3,300 ft exposed west of the <br /> Uncompahgre Uplift. Consists of interbedded red-brown subarkosic, arkosic and <br /> micaceous sandstone and lavender-brown conglomerate; sandstone is fine to coarse- <br /> grained. Cross-beds and thin to massive beds are present, forming smooth to rounded <br /> Western Water& Land, Inc. 9 <br />