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<br />. <br /> <br />. <br /> <br />3 <br /> <br />- <br /> <br />00 <br />"to; <br />.... <br /> <br />DESCRIPTION OF THE EXISTING GEOLOGICAL/PALEONTOLOGICAL ENVIRONMENT <br /> <br />Structural Setting <br /> <br />c <br /> <br />The Juniper - Cross Mountain Project area lies within a linear, northwest- <br /> <br />southeast trending region of relative uplift, which connects the strongly <br /> <br />positive Uinta Mountains and White River Uplifts, and which separates the <br /> <br />Sand Wash (southern Washakie) Basin to the north from the Piceance Basin <br /> <br />to the south. Within this region of general uplift are several local en <br /> <br /> <br />echelon folds, including the Cross Mountain and Juniper Mountain Anticlines. <br /> <br />These two anticlines are relatively simple upfolds of the earth's crustal <br /> <br />layers, which have been pushed up several thousand feet at their centers. <br />However, the Cross Mountain Anticline is broken along its western side by <br /> <br />a very large fault of at least 5000 feet of vertical displacement; and two <br /> <br />reverse faults cause repetition of rock strata along the eastern flank of <br /> <br />the Juniper Mountain Anticline at Juniper Canyon. Both anticlines trend <br />basically north-south and have been dissected in an east-west direction by <br />the Yampa River, thus forming spectacular canyons. <br /> <br />'Geomorphology <br /> <br />The principle geomorphological features of the Juniper - Cross Mountain <br />Project area are the Juniper and Cross Mountain Canyons, the broad flood- <br />plains of the Yampa River upstream from both canyons, and the area of hog- <br />backs and entrenched meanders traversed by the river between Craig and the <br /> <br />Seeley Ranch. <br /> <br />At first view the canyons seem paradoxical. -- Why does the river cut <br />right through these uplifted structures (Juniper and Cross Mountain <br /> <br />--- .-.. <br />