494 
INDEX. 
Page. 
Dexter  coal,  occurrence  and  character  of . .  287-288 
section  of 287 
Diabase,  occurrence  and  character  of 132 
Diamond  Coal  and  Coke  Co.,  Wyo.,  coal  of, 
analysis  of 339 
mine  of 337 
Diamond  mine,  N.  Dak.,  lignite  of,  analyses 
of 323 
Diamondville,  Wyo.,  coal  at 337 
Dickinson,  N.  Dak.,  lignite  at,  analysis  of. .      323 
Dickinson  Brick  Co.,  N.  Dak.,  lignite  of, 
analysis  of 323 
Dietz,  Wyo.,  coal  near,  section  of 303-304 
Diller,  J.  S.,  on  California  copper 104-105 
Diorite,  gold  in 56 
Dirtseller  Ridge,  Ala.,  iron  mines  on 178-179 
analyses  of 179 
Dolly  Ann  mine,  Va.,  iron  ores  of 180-187 
analysis  of 187 
Dolomite,  occurrence  and  development  of.  397-399 
Dolores  formation,   occurrence   and  char- 
acter of 125-120 
Donnely,  S.  P.,  ores  discovered  by 46 
Douglas,  Ariz.,  smelting  at 99 
Draper  Mountain,  Va.,  iron  ores  at 193 
Dry  Creek  district,  Colo.,  coal  of 233 
coal  of,  analysis  and  section  of 233 
Ducktown  (Tenn.)  copper  belt,  ores  of 107, 
119-120 
ores  of,  smelting  of 96, 120 
Dugout  Canyon,  Utah,  coal  of 295 
coal  of,  analysis  of 294 
Durango,  Colo.,  coal  near,  analysis  of 258 
coal  near,  sections  of 244-246 
volcanic  ash  near 476-478 
Durango  district,  Colo.,  coal  of 243-244 
coal  of,  analysis  of 258 
sections  of 243-244 
Durango-Gallup  eoal  field,  Colo.-N.    Mex., 
coal  of 242-258 
coal  of.  analyses  of 258 
description  of 241-258 
geology  of 242 
map  of 242 
work  in 22 
Dutton,  C.  E.,  on  High  Plateaus  of  Utah  ..        88 
K. 
East  St.  Louis,  111.,  glass  making  at 460 
Eastern  Kentucky    Railroad  district,  coal 
of 267-2HS 
coal  of,  sections  of 268 
Eastham  region,  Mass.,  clays  of 437 
Eckel,  E.  ('.,  on  cement  resources  of  Cum- 
berland Gap  district 369  371 
on  clays  of  Garland  Co. ,  Ark 407  110 
on  iron  ores  and  nonmetalliferous  min 
erals 20-24 
on  iron  ores  of  northern  Alabama 172  179 
on  Oriskany  and  Clinton   iron  ores  of 
Virginia is:;  L89 
work  of 21, 23, 183-184 
Economic  investigations,  publical  ions  on. .     7-13 
Eddy  district,  Colo.,  coal  of 230-231 
coal  of.  analysis  of 230 
section  in 230 
Page. 
Eden,  Nev.,  ore  deposits  of 66 
Eleanora  mine,  Pa.,  production  of 279 
Electric  mine,  N.  Dak.,  lignite  from,  analy- 
ses of 323 
Elk  Mountains,  Colo.,  iron  ores  in 196-197 
Elk  Run  mine,  Pa.,  production  of 279 
Elkhead  Creek,  Colo.,  coal  field  on 239 
Elkhead  Mountain,  Colo.,  rocks  of 29 
Ely,  Nev.,  copper  ores  of,  treatment  of . 95 
Ely-Young  tunnel,  Colo.,  description  of 33 
Emery  mine,  Utah,  coal  of 301 
coal  of,  analysis  of 294 
Emmons,  S.  F.,  on  copper  in  Red  Beds 127 
on  investigation  of  metalliferous  ores..  14-19 
on  lead  and  zinc  ores 169 
work  of 28,  55 
Emmons,  S.  F.,  and  Irving,  J.  D.,  report  of, 
on  Leadville  district 15-16 
Emmons,  YV.  II.,  on  Bear  Creek,  Colo. ,  ore 
deposits 25-27 
on  Cash  in  mine,  Colo 125-128 
work  of 18, 125 
Encampmenl    district,    Wyo.,    description 
of 122-123 
Engle  coal  field,  N.  Mex.,  description  of 240 
Erskin  mine,  Wyo.,  coal  of 312 
E\  a  list  on,  Wyo.,  coal  near 338 
oil  well  near 347 
Evanston  formation,  coals  of 341 
coals  of,  analyses  of 341 
F. 
Falmouth  region,  Mass.,  clays  of 440 
Farwell   Mountain.  Colo.,  cross  section  of, 
figure  showing 29 
ores  of 33 
rocks  of 29 
Fenneman,  X.  M..  work  of 204 
Fenneman,    N.    M.,    and    Gale,    II.    S.,    on 
Yampa  coal  field 226-239 
Ferriferous     limestone,     clays     associated 
with 413-415 
ela>  s  associated  wit  h.  sect  ions  of 413-414 
Eerron  Canyon,  Utah,  coal  of 301 
Fertilizers,  mineral,  bibliography  of 486 
Fish  Creek.  Colo.,  coal  on 232 
Fisher,  c.  A.,  on  Bear  Creek  coal  fields...  269-270 
on  mineral  resources  of  Bighorn  basin  311-315 
work  of 206, 269 
Fisher  River,  Mont.,   mines  id,  description 
Of 50 
Florence  coal  mine,  Pa.,  production  of. ..   278-279 
Florida-C.oldfield  Mining  Co.,  mine  of 61 
Florida  Mesa,  Colo.,  volcanic  ash  on 476-477* 
Folios,  geologic.    See  Geologic  folios. 
Foothill  copper  belt,  Cal.,  copper  ores  of.   104, 106 
Forks,  Me.,  slate  of,  description  of 449  45Q 
Fort    Payne,  Ala.,  iron  ores  at, 175 
iron  ores  at.  analyses  of 176 
sections  at 175 
Fort  Payne  chert  .  occurrence  of 173 
Fortification  Creek,  Colo.,  coal  field  on 239 
Fossil,  Wyo.,  oil  wells  at  and  near...  347-348,349 
Fox  Hills  sandstone,  occurrence  of 317 
France,  copper  in,  production  of 94 
Franklin  Furnace  quadrangle,  N.  •!.,  work 
in 17,21 
