304 INDEX. 



Page. 



Monroe Amphitheater 50,227 



Moraine Valley 2(57 



Musinia 169 



Navajo Mountain 290 



Nebo, Mount 2,260 



Nephelin 89 



Nephdin-basaU, classification of 111 



Nephclin-dolerite, classification of Ill 



Nevadito. {See Ehyolite.) 



Obsidian 103,107 



Olivin 89 



Order of eruptions 62,131-137 



Orographic forms 51,54 



PaliBozoic formations 143 



Panquitch CaSon; 218 



Hayfield 238,295 



Lake 199 



Valley 212 



Piiria Valley 252,297 



Pdria fold (see Echo Cliffs' monocline) 44 



Paunsdgunt Plateau 3,251 



Pilvant 3,169,170 



Park Mountains 48 



Park Province 3 



Parallelism of faults ... 27 



to ancient shore line 45 



Permian or Permo-Carboniferous (see Shiuilrump) 146 



Phonolite, classification of 107 



of East Fork Canon 248 



Pink Cliffs 159,204,211,253 



Plasticity of the earth 20 



Plateau Province 5,8,49 



Plateau scenery 8,208,252,286 



Plication... 46 



Pliocene erosion 21, 40 



Faulting 28,34 



Porphyrilic granite 119 



Texture 92 



Trachytes 94 



Potash in volcanic rocks 89,117, 123 



Potato Valley 289,291 



Powell, J. W 5,19,27,143,158,290 



Pre-Tertiary flexures 43 



Primordial magma 114,124 



Propj-lite, augitic, classification of 109 



Classification of 102,108 



Earliest eruptions of 39,57 



Hornbleudic, classification of 108 



Awapa Plateau 275 



Monroe Amphitheater 229,242 



Sevier Plateau 229,237,242 



Order of sequence 63,07,138 



Quartz 09,109 



Pumice 103 



Quartz propylite 69,109 



