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<br />. <br /> <br />. <br /> <br />. <br /> <br />2873 T1le base of the Navajo Sandstone is not exposed in <br /> <br /> <br />the McElmo Canyon urea, so the total thickness is not known. <br /> <br /> <br />According to Ekren and Houser (1958, p. 74), it is about <br /> <br /> <br />300 feet tI1ick at Sand Creek, a tributary of McElmo CreeJe <br /> <br /> <br />At Tow:J.oc, 180 feet of Navajo ,.,ilS t:J.pped in water well <br /> <br /> <br />B-19, drilled in 1957. It thickens west of the Ute <br /> <br /> <br />Mountain area and reaclles a maximum known thickness of <br /> <br />1,800 fect at zion Nation:J.l Park In Utah. <br /> <br />It probably <br /> <br />wedges out In or near Mesa Verde National Park. <br /> <br />T11is <br /> <br />thinning is considered to be mainly depositional. A <br />\-iater well driJ.leu at trlC park he3.dqu3.rters did not <br />penetrate a recoanizable sectlon of Navajo. Strobell <br /> <br /> <br />(1956) indicates a thinning east\.,3.rd Clnd southw,3rd from <br /> <br /> <br />200 f'2et to a ',iedCJc-out in the Cu.rrizc nount3.in area "- <br /> <br />fe'.., mlles south\vest of the reservation. <br /> <br />Figure 9 shows <br /> <br />Figure 9 (cartion on next page) belongs near ilCre. <br /> <br />the approximate limit of the N~vajo Sandstone and the <br /> <br /> <br />Kayenta Formation. <br /> <br /> <br />T1le age of the Navajo Sandstone on the Colorado Plateau <br /> <br /> <br />is considered to be Late Triassic(?) and Jurassic by <br /> <br /> <br />Lewis, Irwin, and Wilson, (1961, p. 1439). <br /> <br />,t-/3 <br />