INDEX. 305 



Page. 

 Rabbit Valley 273,270 



Recency of faults 42 



Recession of cliffs > 19 



Red Gate 278 281 



Rbyolite, classification of 101 }03 



Occurrence in — 



Markiigunt 61,66,193,197 



Sevier Valley 66,213 



Tusbar 60,06,175,177,180 



Order of sequence 63,67,131-137 



Richthofen, classification of volcanic rocks 103 105 



Order of sequence of eruptions 62 



Rivers, persistence of lg 



Roan Cliffs 161 



Salina 170 



Salina Canon. 163,256 



San Juan River 290 



San Rafael monocline 44 



San Rafael swell 19 



San Pete Plateau 165 



San Pete Valley 161 



Scrope, G. P., lavas of the Auvergne 56, 231 



Selenite in Jurassic sbales 154 



Sequence of eruptions 62, 131-137 



Sevier fault 30,163,225,238 



Sevier Plateau, general account of (Chap. XI) 225 



Relations to District of Higb Plateaus 3 



Western front 171, 226 



Sevier River 212 



Sevier Valley 3,-211 



Sbinurump, tbe I 144 



Markagunt 208 



Thousand Lake Mountain 281 



Circle Cliffs 290 



Shore line of the Eocene Lake 44, 184 



Sierra Abajo 50 



Sierra La Sal 289 



Silicified wood 147, 207 



Silica, percentage of, in lavas 88, 117, 123 



Soda in volcanic rocks 89, 117, 123 



Stratigraphy of tbe High Plateaus (Chap. VI) 243 



Strawberry Valley 258 



Structural geology (Chap. II) 25 



Sub-acid rocks. (See Trachyte.) 

 Sub-basic rocks. (See Andesite. ) 



Subsidence of Cretaceous-Eocene beds 13 



Summit Valley 259 



Table Cliff 253,291,257 



Tachylite Ill 



Tantalus Creek "287 



Temple Creek 2S7 



Terrill, Mount 259,267 



Tertiary formations ,* 158 



20 n p 



