INDEX. 
A - Page. 
Acknowledgments to those aiding 13-14 
Adams. John, discoveries by 110 
lUaskite, definition of 37 
occurrence and character of 58, 178-179 
A Ik;; li Spring, description of 19-20, 89 
rocks near 57-59, 62-63, 96 
water of, analysis of 19 
Alkali Spring Flat, description of 76-77 
Alluvium, occurrence and character of 52, 
78,166-167, 17S. 100,204-205 
Amargosa Desert, depth to water in 159 
description of 158-160 
geology of 36, 158-160 
section across, figure showing 21 
sections in 159, 160 
|ma rgosa mine, rocks in 35 
Amargosa Mountain system, descriptive 
geology of 160—195 
Amargosa Range, economic geology of . . . 173-176 
geologic history of COO 
geology of. . 27-29, 31-34, 41, 106, 162-172, 199-200 
prospecting in 175-176 
structure of 172-17 9 
topography of 160-162 
Ama rgosa River, description of 18 
springs in 157 
Amboccelia sp., occurrence of 122 
Ammonia tanks, rocks near 136 
wa ter in 131 
Andesite, definition of 37 
occurrence and character of 32, 
61, 72, 73, 94-95, 96, 125, 135-136, 167-168, 179-180 
Animals, abundancy of 23 
Antelope Spring, description of 89 
rocks near 90-91, 93-94 
water from 138 
Aplite, definition of 37 
Archa^ocidras sp., occurrence of 122 
Area of district 14 
Ash Meadows, section in 160 
springs at 20 
wells in 159 
section of 159 
Aviculipecten sp., occurrence of 122 
B. 
Bare Mountain, economic geology of . . 45, 156-157 
geology of 154-156 
section of 154 
structure of 156 
topography of 153-154 
Basalt, definition of 37 
occurrence and character of . : 32, 33, 62, 
68, 74, 75-76, 79-80, 87, 95, 96-97, 98-99, 
105-107, 116, 127, 146-147, 151-152, 153 
156, 170-171, 181, 186-187,194,209-210 
Basalt, topography due to, view of 
Beatty description of 25 
Bell, T J., discoveries by 81 
Belted Peak, altitude of lis 
section through, figure showing 126 
Belted Range, economic geology of 128 131 
geology of.. 28-29,30,32,42, 105.107, 115, 119 127 
location of us 
section across 122 
figures showing 119,126,127 
structure of 128 
topography of 1 18-1 19 
Benedict, S. G., work of 13, 141 
Bibliography of region 15-16 
Big Dune, recks near J 75 
Billingsella, occurrence of 149 
Bismuth mine, ore deposits of 175 
Blakes Camp, ore deposits al 49,110 
rocks near 106, 107 
Borax, occurrence of 197,201 ,212 
Boundary Canyon, fossils from 165 
rocks in , 167 
Breen Creek, description of 18 19 
ore deposits on 109 
Bullfrog, description of 25 
rocks at and nea r 35, 1 7s 
Bullfrog-George prospect ore deposits of . 194 195 
Bullfrog Hills, economic geology of 182 
geology of 27-29,32,33,41,105,106, 176-181 
structure of ! s ' 
topography of 176 
Butler, J. L., discoveries by 
C. 
Cactus and Kawicb ranges, hills between, 
geology of 96-97 
topography of 
Cactus Flat, description of 
Cactus Mining Company, property of - 95 
Cactus Range, economic geology of 95 96 
geology of. .. . 20 33, 42, 17 18, 89 94, 104, 105, 106 
structure of s • 85 
topography of 
Cactus Spring, description of 
ore deposits at 46 
rocks near 92 93,95,96 
Calico Hills, rocks in 48, 146 147 
Cambrian rocks, deposition of 
occurrence and cha racter of . . 28, 5 1 52 
59,66,72,77-78,84,141,164,183 184, I 
ores in 81,82 
structure of 
62-63,68 69,80 81,87-88,149, L87, 194 
Campbell, M. R., on Death Valley 
work of 
Cane Spring, flow of 
213 
