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Show INDEX. 307 Page. Unconformity of Tertiary and Cretaceous...........................................11,57,280,281,288 Uplifting at centers of erosion........................................."*..-:.................. 18,20 of Plateau Province........................................-............................ 15,18 Vermilion Cliffs (see also Triassic)........................................................... 148 Virgin Eiver, cafions of.......................................................,„............ * 209 Volcanic conglomerates.....................................39,70,75,178,190,214,237,238,244,275,295 Volcanic eruptions, causes of (Chap. V)...................................................... 113 Wasatch monocline.....r.................................¦.................................. 160,257 Wasatch Mountains.............................c~.........T................................ 2 Wasatch Plateau, general discussion of (Chap. VII)------.................................----- 160 Eelations to Plateau Province......................................................... 4,19 Water-Pocket fold....................................................................44,280,286,287 West Gunnison fault....................................................................... 164 West Kaibab fault.......................................................................... 32 Zirkel, F., augitic andesites................................................................. 65 Propylites............................................................................... 108 Ehyolites.............................................................................. 104 Zone of diverse displacement................................................................ 162 o |