INDEX. 
95 
Page. 
Hualpai Peak, elevation of 24 
Hualpai Valley, description of 49-50 
filling in 64 
formation of 61 
sections of, plate showing 24 
structure of 50 
underground water in 77 
Hualpai Wash, description of 33 
rocks in 33-34 
section near, figure showing 34 
Iluntington, E., and Goldthwaite, J. W., on 
Grand Wash fault 31-32 
on Toquerville region 72-73 
I. 
Iceberg Canyon, section of, figure showing. . . 31 
Igneous rocks, description of 81-91 
occurrence and character of 20, 2 i-29, 35 
Investigation, scope of 9-10 
K. 
Kingman, rhyolific asli at , view of 22 
wells at. 78,80 
I,. 
Las Vegas W ash, description of 37 
rocks of 37 
section near, figure showing 37 
Lighthouse Rock, channels at 48 
M. 
McCarn, II. L., on minerals of region 11 
McMullan Valley, description of 55 
section of, plate showing 24 
underground water in 77 
wells in 80 
Map of western Arizona 9 
Marcou , Jules, on region 10-1 1 
Mesozoic history, outline of 57 
Mohave Canyon, description of 42-43 
Mohave Mountains, description of 27-28 
location of 13, 27 
rocks of 28, 42-43 
Mohave Peak, section of, plate showing 24 
Mohave peneplain, extent of 73-74 
Mohave Valley, description of 41 
rocks of 41-42 
section of, figure showing 42 
Mountain region, location and character of 11-14 
Mountains, description of 12 11 
See also Highlands. 
Mount Perkins, elevation of 26 
Mount Wilson, elevation of 25 
Murphy, E. C, on precipitation 74 
Music Mountain, section of, plate showing 24 
N. 
Needles, description of 27-28, 42-43 
location of 27, 42 
rainfall at 74 
rocks of 28, 42 
section of, figures showing 24, 42 
Neels, Utah, well at, section of 69-70 
Nelson, fossils from it; 
well at 78,80 
record of 78 
Newberry, J. S.. on geology of region 11 
O. Page. 
Olivine basalts, occurrence and character of . . 88-90 
Olivine diabase, occurrence and character of . 90 
P. 
Pacific coast, comparison of, with western 
Arizona 71-72 
Paleozoic history, outline of 57 
Palomas Mountains, location of 29 
Peach Springs, well at 78,80 
well at, record of 78 
Peacock Mountains, rocks of 25 
Plains, description of 13 
Planet, iron ore near 11 
Plateau region, comparison of with western 
Arizona 72-74 
location and character of 11-12 
uplift of 61-62 
Powell, J. W., on region 11 
Pratt, J. EL, on gold deposits II 
Pre-Cambrian history, outline of 56 
Pre-Cambrian rocks, occurrence and character 
of 14-15,23,81-82 
See also Granite. 
Precipitation, records of 74 
Posas Plain, description of 55 
Pyramid Canyon, description of 39-41 
map and sect ion of, plate showing 38 
reclamation work at .'59-40 
rocks in 26, 39 
sections at, figures showing 40,42 
Q. 
Quaternary history, outline, of 62-67 
Quaternary rocks, occurrence and character 
of 17-18, 23 
R. 
Rainfall, records of 74 
Ranegras Plain, description of 55 
Rapids, occurrence and character of 30 
Red Lake, location and character of 49 
Redwall limestone, character and distribu- 
tion of 15-16, 19. 21 . 57 
fossils from 15, 16 
Rhyolite, eruption of 59 
occurrence and character of 83 85 
Rhyolite porphyry, occurrence and character 
of 90 91 
Rhyolitic ash, view of 22 
Rivers, diversion of 64 65 
Rocks. See Formations. 
Rock samples, list of 91-92 
Round Island, rocks near 39 
section near, figure showing 37 
S. 
Sacramento Valley, view in 52 
See also Detrital-Sacramento. 
Sacramento Wash, gravels in, view of 10 
Salt, occurrence of 36 
Salt River, diversion of 64 
Santa Maria Canyon, description of 22, 53 
Scope of work st atement of 9-10 
Scour, depth of 66-67, 76 
Signal Canyon, description of. 52 
rocks in -- 
View in 22 
