INDEX. 
521 
Page. 
Coeur  d'Alene  mining  district,  Idaho,  in- 
vestigations in 23 
Coke,  analyses  of,  from  Elders  Ridge  and 
Connellsville 324 
Cold  Bay  petroleum  field,  Alaska,  geogra- 
phy and  geology  of 380-381 
petroleum  in 381-382 
Collier,  A.  J.,  paper  by,  on  tin  deposits  in 
Alaska 154-167 
paper  by,  title  and  description  of 21 
professional  paper  by,  on  Alaskan  geol- 
ogy, title  of 18 
Collier,  A.  J.,  and  others,  cited  on  Alaskan 
geology 52 
Colorado,  petroleum  in 383-391 
work  in,  on  metalliferous  ores 22 
Conemaugh  formation,  shale  in,  occurrence 
and  thickness  of 474-476 
Conie  coal  mine,  Wyoming,  coal  at 349-350 
Connellsville  coal,  analysis  of 302 
coke  from,  analysis  of 324 
Controller    Bay   petroleum    field,   Alaska, 
geography  of 366-367 
geology  of 367-368 
petroleum  in 368-371 
Cook  Inlet  petroleum  field,  Alaska,  geog- 
raphy of 376 
geology  of 376-378 
petroleum  in 378-379 
Cook  Inlet  region,  Alaska,  gold  placers  in.  47-48 
Copper,  papers  on 169-201 
publications  on,  titles  of 20,  200-201 
Copper  deposits,  California 172-176 
Georgia 180-186 
New  Jersey 187-189 
Vermont 190-199 
Copper  ores,  assays  of 193, 196,  197 
Copper  River  basin,  gold  placer  deposits  in.        47 
Copperfield  copper  mine,  Vermont,  deposit 
at 192-193,  195-196 
geology  at 191 
Corinth  copper  mines,  Vermont 197-198 
Craigsville,  Va.,  section  near 460 
Creech  coal,  occurrence  and  thickness  of.  269-270 
Crider,  A.  F.,  work  of 27 
Cripple  Creek  district,  Colorado,  resurvey 
of 22 
Cross,  Whitman,  geologic  folios  in  prepara- 
tion by 20 
work  in 25-26 
Cumberland  Gap  coalfield,  coal  in 260-275 
development  of 275 
location,  topography,  and  structure  of  259-260 
sections  in 261, 274 
Cymbria  coal  mine,  Pennsylvania,  opera- 
tions at 299,  303 
D. 
Dale,  T.  N.,  paper  by,  on  Arkansas  roofing 
slates 414-416 
Darlington    clay,    occurrence    and    thick- 
ness of 472 
Darton,  N.   H.,  cited  on  well  at  Medora, 
N.  Dak 284 
Deer  Creek  coal  field,  Arizona,  coal  in  . . .  248-257 
geology  of 243-247 
Page. 
Deer  Creek  coal  field,  Arizona,  location  and 
general  description  of 240-242 
sections  in 249, 250, 251, 252 
sketch  map  of 241 
Devereux,  W.  B.,  cited  on  Deer  Creek  coal 
field.  Arizona 245, 248 
Dickie  coal  mines,  Wyoming,  coal  at 351-352 
Diller,  J.  S.,   cited  on  mica-peridotite  of 
Kentucky 508 
geologic  folios  in  preparation  by  20 
paper    by,    on    Redding     quadrangle, 
California 169-179 
title  and  description  of 22 
D'Invilliers,    E.   V.,  and  McCreath,  A.  S., 
cited  on  Middlesboro  coal  field.      268 
Douglas  Island,  Alaska,  gold  mines  on 39-41 
Drinkwater  gold  mines,  Nevada,  deposits 
and  operations  at 113 
Dunkard    Creek   oil    field,   Pennsylvania, 
petroleum  in 408 
Durham  coal,  occurrence  and  thickness  of  273-274 
Dyer,  Nev.,  gold-mining  district  near 115 
E. 
Eckel,   E.   C,  cited  on  copper  deposits  of 
Georgia 180 
paper  by,  on  cement-rock  deposits  of 
Lehigh  district 448-456 
on  salt  industry  in  Utah  and  Cali- 
fornia   488-495 
on  slate  deposits  of  California  and 
Utah 417-423 
work  of 12, 26-27 
Economic  geology,  publications  of  Survey 
on 12-17 
publications  on,  during  the  year,  list 
and  descriptions  of 18-19 
in  preparation,  list  of 19-20 
Edri  coal  mine,  Pennsylvania,  operations  at      315 
Elders  Ridge  coal  field,  Pennsylvania,  coal 
in 316-324 
development  of 312-316 
extent  and  structure  of 311-312 
map  of 313 
sections  in 316, 317, 318, 319, 320 
Eldridge,  G.  H.,  cited  on  coal  in  Rocky  Fork 
district,  Wyoming 359 
Elizabeth  copper  mine,  Vermont,  geology 
and  ore  deposits  of 191, 
192-193, 196-197 
Elizabeth  sand,  Pennsylvania,  occurrence 
and  thickness  of 402 
Ely  copper  mine,  Vermont,  geology  and 
ore  deposits  of 191, 192, 194-196 
Emmons,  S.  F.,  cited  on  fluorspar  deposits 
of  Illinois 505 
cited  on  ore  deposits 139 
cited  on  Uinta  uplift 223 
paper  by,  on  investigation  of  metallifer- 
ous ores 18-24 
Empire  coal  mine,  Pennsylvania,  operations 
at 304-305 
Eureka  slate  quarry,  California,  slate  in.  418-420 
F. 
Fairbanks  Creek,  Alaska,  gold  placers  on. . .  71-72 
Fairbanks  district,  Alaska,  geology  of 67 
