| OCR Text |
Show INDEX. Page. Acid rocks. (See Ehyolite.) Ages of eruptions.......................................-................................39,56,59,61 Alluvial cones........................................................................39,214,249,277 Alluvial conglomerates, general discussion of............................................... 214 Alumina in volcanic rocks............___................-...............................89,117,123 Andesite, augitic: Classification of.....................................................................101,108,109 Occurring in theâ€" Aquarius Plateau............................................................... 293,295 Awapa Plateau................................................................. 275 Fish Lake Plateau............................................................. 261.266 Mount Hilgard................................................................. 272 Markagunt Plateau.....................................-----T............«,.....196,204 Monroe Amphitheater.......................................................... 229,239 Sevier Plateau..........................................................229,232,235,242 Tushar........................................................................ 177,181 Order of sequence..............................................................63,65,67,131-137 Andesite, hornblendic: Classification of........................................................................ 110 Occurrences.....................................................................230,237,242,260 Order of sequence....................................................................67,131-137 Andesite, quartz. (See Dacite.) Aquarius Plateau, general discussion of (Chap. XII)......................................... 284 Relations to District of the High Plateaus............................................... 5 Argilloid trachyte. (See Trachyte.) Archaean rocks............................................................................. 143 Awapa Plateau, general discussion of....................................................... 272 Eolations to District of the High Plateaus____.......................................... 4 Baldy, Mount.............................................................................. 172 Basalt: Chemical constitution of................................................................ 123 Classification of........................................................................ 101,110 Leucite................................................................................ Ill Liquidity of.......___.................................................................. 135 Nephelin............................................................................... Ill Order of sequence....................................................................67,131-137 Supervision of.......................................................................... 135 Synthetic character of.................................................................. 122 299 |
