INDEX. 
A. Page. 
Andesile, older, eruption of 58 
occurrence and character of 82-83 
Andesite, younger, eruption of 59 
occurrence and character of 85-87 
Aquarius Cliffs, description of 13. 20 
location of 13-20 
section of, plate showing 24 
Aquarius Mountains, description of 22 
location of 13, 22 
rocks of 22 
view of 22 
Arizona, geographic provinces of 11-12 
western part of, map of 9 
Arnold, Ralph, on Pacific coast correlation.. 71-72 
Artillery Mountains, description of 22 
location of 13, 22 
rocks of 22-23 
Artillery Peak, section of, plate showing 24 
Ash, rhyolitic, view of 22 
Aubrey Canyon, description of 44-45 
rocks in 45 
Aubrey Hills, description of 13, 25 
location of 13, 25 
rocks of 25 
B. 
Basalt flows, description of 18 
occurrence of 20, 61-62, 63 
Base-leveling, period of 56 
Big Bend, description of 43 
Big Sandy Valley, description of 50, 64 
rocks of 51 
sections of, figures showing 24, 51 
structure of 51-52 
wells in 79-80 
Big Sandy Wash, flow of 77 
Black Canyon, description of 37 
entrance to, view of 34 
erosion in 65 
rocks in 26, 37 
section in, figure showing 37 
Black Mesa, description of 26-27 
erosional forms at, view of 26 
location of 13, 26 
rocks of 27 
section of, plate showing 24 
Black Mountain Range, description of 13 
location of: 13 
Black Mountains, description of 25-26 
location of 13, 25 
rocks of 26 
Page. 
Blake, W. P., on iron ore of region 11 
Bonneville, Lake, correlation of, with west- 
ern Arizona 08-71 
Boulder Canyon, description of 36-37 
erosion in 65 
rocks in 26, 36 
section of, figure showing 35 
Boundary Cone, elevation of 27 
Boutwell, J. W., on Lake Bonneville beds... 68 
Buckskin Mountains, description of 14, 28-29 
location of 14, 28 
rocks of 29 
Bulls Head rock, channels at 39-41 
views at 22, 40 
C. 
Cacopah dam site, channels at 48 
Cactus Plains, description of 55 
section of, plate showing 24 
underground water in 77 
California, southern, correlation of. with 
western Arizona 71 
Cambrian rocks, occurrence and character of. 15, 21 
Canyon cutting, first period of description of. 62-63 
second period of, description of 65 
third period of, description of 0<i 
Carboniferous rocks, description of 15-16 
fossils in 15-16 
Cedar, mining at 25 
Cerbat Mountains, description of 13, 23 
location of L3, 23 
rocks of .". 23-24 
section of, plate showing 24 
structure of 24 
uplift of 01 
Chamberlin, T. C, on river erosion 66-67 
Chemehuevis gravel, deposition of 65-66 
occurrence and character of. . 18, 41-42, 43-44, 46 
view of 22 
Chemehuevis Valley, description of 43-44 
sections in, figures showing 44 
Cherums Peak, elevation of 23 
Chocolate Canyon, channels at 49 
map and section of 48 
Chocolate Mountains, canyon in 17- 18 
canyon in, rocks in 48 
Colorado Plateau, section of, plate showing. . 24 
Colorado River,' channel of, filling in 75-70 
dams on 75-76 
diversion of 64 65 
effect of uplift on 62 
93 
