300 INDEX. 



Page. 

 Basalt — Continued. 



Occurring in the — 



Aqiiarius Plateau 295 



Archiuau 93 



Awapa Plateau 276 



Carbouiferons 93 



Dog Valley 190 



Grass Valley 250 



Markiigunt Plateau 197,199,200,202 



Paunsriguut Plateau 256 



Permian 93 



Silurian 93 



Triassic 93 



Tushar 177,180,183 



Basaltic cones 62,198,256 



Basic rocks. (See Basalt.) 



Basin Province, its topography 6 



Mountain ranges . 47 



Structural features 51 



Bear Peak 192 



Boar Valley 191 



Belknap, Mount 172 



Hittoi- Creek beds (see Eocene) 12, 73, 158, 159, 195, 2:;8 



Blue Mountain 228,232 



Bonneville Lake 41,211 



Book Cliffs 161 



Bullion Canon 174 



CjiTions 8,252,286,290 



Carbonaceous shales 10, 156 



Carboniferous strata 143, 184 



Centers of erosion 18,297 



Circle Cliffs 289 



Circle Valley 213 



Chalcedony 205,238 



Chemical characters of volcanic rocks 88, 117, 123 



Classification of volcanic rocks (Chap. IV) 82 



Coal 155,156 



Cones, basaltic 62,198,256 



Colorado River 8,15,278,287,289 



Cotta, B. von, Pre-Tertiary eruptions 96 



Conglomerates, general discussion of the formation of 214 



Conglomerate, Shiniirump 147 



Conglomerates, volcanic 39,70,75,178,214,237,238,275,295 



Cretaceous, the — 



Brackish water beds of 10 



Carbonaceous shales 10 



Condition of Plateau Country during 9 



Correlations of 9 



Extent of, in the West 9 



Island 295 



Of the— 



Aquarius Plateau 288 



Kaiparowits Plateau 291 



Markigunt Plateau 206 



