304 INDEX. 



Page. 



Monroe Amphitheater 50,227 



Moraine Valley 267 



Musinia 169 



Navajo Mountain 290 



Nebo, Mount 2,260 



Nephelin .. 89 



Nephelin-basaH, classification of Ill 



Nephelin-dolerite, classification of Ill 



Nevaditc. (See Rhyolite.) 



Obsidian 103,107 



Olivin 89 



Order of eruptions 62,131-137 



Orographic forms 51,54 



Palaeozoic formations 143 



Panquitch Canon 212 



Hayfield 238,295 



Lake 199 



Valley 212 



Puria Valley 252,297 



Paria fold (see Echo Cliffs' monocline) 44 



Paunsagunt Plateau 3,251 



Pavant 3,109,170 



Park Mountains 48 



Park Province 3 



Parallelism of faults 27 



to ancient shore line 45 



Permian or Permo-Carboniferous (see Shinarump) 146 



Phonolite, classification of 107 



of East Fork Canon 248 



Pink Cliffs 159,204,211,253 



Plasticity of tbe earth 20 



Plateau Province 5,8,49 



Plateau scenery 8,208,252,286 



Plication 46 



Pliocene erosion 21,40 



Faulting 28,34 



Porphyritic 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 



Propylite, augitic, classification of 109 



Classification of 102,108 



Earliest eruptions of 39,57 



Hornblendic, classification of 103 



Awapa Plateau 275 



Monroe Amphitheater 229,242 



Sevier Plateau 229,237,242 



Order of sequence 63, 67, 138 



Quartz 69,109 



Pumice 103 



Quartz propylite 69,109 



