608 
INDEX. 
Page. 
Coal  fields,  work  in 29 
( lobalt,  occurrence  of 259 
Cobb  coal,  occurrence  and  thickness  of 371 
Cobbs  Gulch,  Colo.,  gold  on 53,  75 
Coeur  d'Alene  district,  Idaho,   copper  de- 
posits in 301 
geography  of 275-276 
geology  of 277-285 
map  showing 279 
gold  deposits  in 299-301 
lead-silver  deposits  in 291-299 
mining  in,  development  of 285-289 
general  conditions  of 301-303 
ore  deposits  in,  character  and  distribu- 
tion of 290  291 
position  of,  man  showing 276 
production  of 289  291 1 
relief  and  drainage  of 276-277 
section  in 280 
silver-lead  deposits  in 291  299 
work  in 26 
Coffeyville,  Kans.,  gas  and  oil  field  al 451 
Coffeyville  formation,  character  and  thick- 
ness of 148 
Cole  Camp  limestone,  correlation  of 23 1 
Colorado,  cement,  Portland,  in,  production 
of 198 
cooperation  by 85 
copper  in,  occurrence  of 227 
gold  production  of 32 
from  lead  ores 38 
from  quartz  veins 36 
gold  and  silver  in,  papers  on 50-127 
lead  production 254,256 
ore  deposits  near  Lake  City  in 78-84 
of  Ouray  district  in 50-77 
petroleum  in 436-440 
placer  deposits  in,  source  of 34 
silver  production  of 32 
from  copper  ores 42 
from  lead  ores 42 
from  quartz  veins 41 
tin  in 165 
work  in  25 
zinc  production  of 253,  262, 270-271 
zinc  ore,  grade  of 270 
Colorado  Central  mine,  Colo.,  obsidian-like 
porphyryin L05 
Colorado  Plateau,  copper  on 22]  232 
Colorado  River,  copper  on 228 
Columbia  mine,  Utah,  developments  at 240 
Columbia    Mountains,   Nev.,  geology    and 
ores  of 132-133 
Columbus,  Miss.,  section  near 519 
wells  near,  log  of 516-517 
Commercial  mine,  Utah,  developments  at .      239 
Connecticut,  iron  ores  in 338-339 
tin  in 163 
Connellsville,  Ala.,  section  near 371 
Conundrum  mine,  Colo.,  ores  of 91 
Copper,  deposits  of,  in  Idaho. 301 
i  iccurrence  of 62, 63, 69, 221-232, 259 
ores  of,  in  Colorado  ..  107,109, 110,  111,  1 L8,  119 
origin  of 223-224, 228, 230-232 
production  of 211  216 
publications  on «,.,,,.,,., 2  19-250 
Page.    1 
Copper,  gray,  occurrence  of,  in  Colorado..       100, 
107,109,118 
Copper  deposits  of    eastern  United  States, 
paper  on 21 7-220 
of  Missouri,  paper  on 233-235    - 
in  Red   Beds  of  Colorado  Plateau   re- 
gion, paper  on 221-236 
Copper  ores,  gold  from,  production  of 37    ] 
silver  from,  production  of 41-42 
Copper  ores.    St  >  also  <  'res,  copper. 
"Cornrock,"  occurrence  of,  in  Colorado  ...      103  I 
Cosmopolitan  mine,  Cal.,  geology  of 48  I 
Cottonwood  district,  Utah,  lead  in 253 
Creede  mines,  Colo.,  lead  production  of  ...      256 
Crescent  mines,  Cal.,  geology  of 16-47 
Crider,  A.  F.,  paper  by,  on  cement  resources 
of  northeast  M  ississippi 510  521 
work  of 30,  31 
Cripple  Creek  district,  Colo.,  gases  in 97-98  1 
geology  of 87-96  I 
gold  production  of,  increase  of 33 
mines  of,  drainage  of 97 
ores  and  ore  bodies  in,  occurrence  and 
character  of '.HI  96 
production  of 8(1 
silver  in 91 
topography  of 86-87 
underground  water  in 96-97 
work  in 20;-21,25,.s;5 
Cross,  Whitman,  acknowledgments  to 204    ' 
on  Cripple  Creek  geology 87  88 
work  of 85 
Crotch  Island,  Me., granite  quarrying  at 491 
Crystal  City  sandstone.      See  St.  Peter  sandstone. 
Cutler  Creek,  Colo.,  rocks  on 52! 
Cutler  formation,  occurrence  and  character 
of 52, til 
Dakota  quartzite,  occurrence  and  character 
of 52-53, 60, 64, 65,  66 
Dale,  T.  N.,  paper  by,  on  slate 486-488   1 
work  of 31    n 
Dall,  W.  H.,  fossils  identified  by 473    | 
Dalton  mine,  Utah,  developments  at 239  1 
Dana,  J.  D.,  on  iron  ore  near  West  Stock- 
bridge.  Mass 337 
Darton,  N.  EL,  acknowledgments  to 531   1 
onbentonite 559   1 
paper  by.  on  coalof  Black  Hills,  Wyo..  429-433   I 
on  Zufii  salt  deposits,  New  Mexico.  565-566  I 
work  of 31    I 
Davis  iron  mines,  Conn.,  section  at 338  I 
Dawson    coal,   occurrence    and    character 
of 39(1-397 
Dayton,  Tex.,  oil  wells  drilled  near 1(12 
Dearing,  Kans.,  gas  and  oil  field  at 451 
Decaturville  limestone,  correlation  of 234 
Delaware  Mountains,  Tex.,  topography  of..       574 
Dennis  lime-tone,  character  and  thickness 
of 448 
Dieulafait,  L.,  on  copper  in  sea  water 223 
Dikes   Colorado,  occurrence  of 94,101-102 
DjUer  ■'   S.,  paper  by,  on  coal  in  Washing- 
ton, near  Portland  <  >reg 411-412 
