258 INDEX 
Page. Page. 
Dolomite nae Ol sansa ence ental seein eee ees 10-11 | Gray copper of miners, character of-.-......--...-.- 224. 
analyses Obj sed eca cetes 22 see cose eee 25-26,210 | Great Western tunnel, features of 160 
calcium and magnesium oxides in-_-....--..--..- 25 | Gunnison formation, position and character of..--. 39-41 
chert nodulesin..--...---.-.----- 
conditions of deposition of--......-.---.--.------- 
Apure SHOWING 2-2. s2e- ee eee eee nee 
figure showing nodule of 
figure showing zones of reduction in ._..___--.-- 18 
origin and character of..-.-...-_-..- 9-13, 22-28, 208-211 
SandStonenvel ng aieese a esee ease eee 26-28 
(Gandy) occurrencelofessnes =e eeee eee eens 7-8 
thickness: of,*-Jcgo255-so nee tee feicenee Ree scan feeeere 10 
28 
Dolomitice quartzite, age of 8 
OCCULrTENCO! Of tee sedeswseniseec ee foceameeseeesees 5-6, 8 
thickness of 
Dolomization, agents of 
detailed description of-.--.---.-.-.--.--------- 206-216 
Dubuque tunnel, features of _.._.--_.-.-._---__-..--- 204 
Durant mine, features of._...-......--.----------- 152-155 
Durant mining claim, litigation by -----..-. XxXIII-XxIVv 
Durant tunnel, features of ---.-.......-..----------- 158 
E. 
East Aspen Mountain fault, features of__....__.--- 69 
Edison No.1 shaft, features of ............-------- 174-175 
Hldnide ey Grape cite dessa 7, 20, 23, 34, 37, 40 
Elk Mountain region, topography of -.---.-- XVII-XVIII 
Emma fault, features of -_.....---....--..--... 181-182, 186 
Emmons, S. F., cited .....--.-.---..-._- 8, 10, 20, 22, 32, 34, 53 
introduction by XVII-XXXII 
letter of transmittal by ..........-..-.----.------ XIIT 
Enterprise tunnel, features of_...........------------ 159 
Erosion, character and amount of........---.--.-. 243-244 
F. 
Faulting, Aspen district. .--..---.--..-.------------ 145-146 
Aspen Mountain i 
Hunter Park district -.--.-.-....-...----------. 128-130 
Menad olanrewet was ese os a ane ee ee 120-125 
present 
Tourtelotte Park area__-----_--.--_..______. 84-107, 117 
Waullts, Apel tte ease te OS mwa a 100-105 
character and measurement of -_- 
present movement along-_.....-.....-.---..--_- 148-149 
topographic effect of .-.....--..-.---...---------. 244. 
Ferration, detailed description of 
Folding, Aspen Mountain __...__.........-------.---— 
EuntenParkagistricteee spec e cease eases 
Menadoiareatace te ate ee eee eee ecen ee ee ates 117-120 
Fossil changed to native silver, figure showing.____ 233 
Fractures in granitic quartz.....--....--....--.----- 229) 
G. 
Galena tunnel, features of _.._....-...-------.----- 160-161 
Gangue minerals, character of --..-..--....---.--- 225-226 
Gibson fault, features of 181 
Girty, G. H., quoted on fossils of Parting Quartzite. 21 
Glaciation; descmipbionto fesse aeae eee 244-250) 
Glauconitic grit, occurrence of .-..-.-.___._-__-______ 6-7 
Glenwood Springs, Colo., analysis of waterfrom_._ 213 
Wolomizationyate sess nets see ae ae ee eee 212-216 
Good Thunder mine, features of __ 175 
Granites chanacter Ole masse sesame 13 
OTIS INO LS ees a cee eee ee et eee EN 4 
Granitic quartz, microscopic fractures in_- 
Gray Carbonate tunnel, course of 
Gypsum, analysis of 
formation of £:------------- 
H. 
Hannibal shaft, features of-......-.---....----.------ 178 
Harkness, Robert, cited__....--..-.--- -- 11,208 
Hidd2n Treasure shaft, features of _-- = i) 
Highland Light shaft, course of __._- mee lr 
Homestake shaft, features of ._- . 158, 167 
Hunt, T. Sterry, cited__..__-_.__ 207 
Hunter Creek glacier, description of -...----..--.--- 249 
Hunter Park district, description of sections taken 
Lal bins iy 2. saat ease eecaaee ees 
features of - 
Rio} Co bbay =p eem ee noc Seo Sate ea eee Soe bey 
TesimMelot structure nee ye ee 130-131 
Hunter Park special map, description of features 
show Ones 3) Sere errant eee 126-182 
description of sections shown on 131-132 
I. 
Ice movement, direction of 
Ice sheet, dimensions of 
intrusive rocks; areiof sa - see eee eee eee ee 
description of -.-.....-....- 
Iowa Chief mine, features of 
Towa fault, features of ----- 22 e-o- nc ceepne ceonne eee 
J. 
dasperoid, definition of_--...-----..-..-..---------- 219-220 
Jay Gould mine, features of - 1i8 
Justice fault, features of. ---.--.--2-..2-_---.-e- nn. 94-95 
J ustice mine, features of ............-_.----------- 175-176 
L. 
Laramie formation, position, character, and thick- 
ness of 
Last Dollar mine, features of__.___- 
Late Acquisition mine, features of - 
Leaching of rocks, deseription of _____ 
Leadville dolomite, calcium oxide in --_- 
CharacteroOfs2 2.0.25 sao eee een 
chemical composition of ----. 
chert nodules and bands in---_.-. 
magnesium oxide in-__...-____ 
OnifiniOfaese ees ae ane 
sandstone veins in-.- 
WOLEaAY UENO WS TN ceocaanbeceonoeccs Senenoe & oe 
Leadville limestone, position and character of ._-... 22 
Leadville mine, description of ..-.-_-.---...------- 201-202 
Lenado, analyses of limestones from_.___.-...._...-- 242 
aU GIN Ola tie aeeec eee eee eae eee -- 120-125 
foldingiat= 2.2: acseess eee caer eee --- 117-121 
mines and workings at and near_--. --- 199-203 
résumé of geology of district near -- --- 202-203 
Lenado fault, features of __......-.--_._....-------- 128-130 
Lenado special map, description of sections shown 
eee RR ERE rE Boon aHBee eens am con ssaccc cate 125-126 
features shown on--- enc pata ee 117-126 
Limestone, analyses of_.-.-...-------------._.- 214, 215, 242 
Limestone above Leadville dolomite, character, 
Tossils yan dice clo heen ae eee eee 28-30 
