96 
INDEX. 
Page. 
Silliman, Benjamin, jr., on geology of region. . 11 
Silt, deposition of 46 
Spherulitic rhyolite, occurrence and character 
of 84-85 
Spurr, J. E., on Nevada geology 58 
Strainer, definition of 30 
Streams, description of 74 
Surface waters, description of. 74-77 
T. 
Temple Bar, conglomerate at, views of 16,34 
description of 35 
rocks at 35-36 
section at, figures showing 24, 35 
Temple Bar conglomerate, basalt in 18, 33, 35 
correlation of 64 
deposition of 63-64 
occurrence and character of 17-18, 
33, 35-36, 53, 56 
views of 16, 34 
Tertiary history, outline of 57-62, 67 
Tertiary rocks, occurrence and character of. . 16-17, 
21,22,23 
Tonto formation, character and distribution 
of 15,19,57 
Topography, description of 12-14 
Travertine, occurrence and character of 30, 34 
Trout Creek, gravels in 51 
section at, figure showing 51 
Truxton Canyon, fossils from 15, 16 
Truxton Plateau, description of 21 
location of 21 
rocks of 21 
section of, plate showing 24 
Tuff, occurrence and character of 84 
U. 
Underground waters, description of 78-80 
indications of 77 
Page. 
Union Pass, erosional forms at, view of 26 
Uplift, occurrence and effects of 61-62 
V. 
Valleys, description of 14 
geographic and geologic details of 29-56 
Virgin Canyon, description of 34 
rocks of 23,34 
section of, figure showing 34 
Virgin Valley, description of 36 
section of, figure showing 35 
Volcanism, occurrence of 63 
W. 
Water development, future of 9-10 
Water supplies, discussion of 74-80 
Wells, data on 78-80 
temperatures in 80 
White Cliff Canyon, rocks of 20 
section of, figure showing 20 
White Hills, description of 13, 23 
location of 13, 23 
rocks of 23 
Williams Canyon, basalt-capped gravels in, 
view of 26 
description of 54 
rocks of 25, 29, 54-55 
section of 54 
Williams River, flow of 77 
Williams Valley, description of 53-54 
rocks in 54-55 
Y. 
Yampai, fossils from 15 
Yampai Cliffs, description of 13, 20-21 
location of 13, 20 
rocks of 21 
section of, plate showing 24 
Yucca, wells at 79, 80 
wells at, record of ! 79 
Yuma, evaporation at 74 
flow at 74 
o 
