ILLUSTRATIONS 
Page. 
late     I.  Map  of  the  Choctaw  coal  field,  Indian  Territory 382 
II.  Map  of  the  Cherokee-Creek  coal  field,  Indian  Territory 394 
III.  Burgettstown,  Pa.,  quadrangle,  showing  lay  of  Pittsburg  coal.  404 
IV.  Geologic  sketch  map  of  the  trans-Pecos  region,  Texas 574 
ig.    1.  Geologic  section  of  Gold  Hill,  Ouray,  Colo 56 
2.  Type  of  silver-bearing  vein  modified  by  replacement  and  bedding 
fault,  Ouray,  Colo 58 
3.  Type  of  silver-bearing  vein  unmodified 59 
4.  East- west  section  of  the  rocks  and  diagram  of  the  ore  bodies  in 
the  American  Nettie  mine,  Ouray,  Colo 67 
5.  Horizontal  plan  of  portion  of  Kirtley  vein,  Georgetown,  Colo 108 
6.  Vertical  section  of  portion  of  Sceptre  vein,  Georgetown,  Colo 112 
7.  Horizontal  plan  of  a  portion  of  the  Seven  Thirty  vein,  George- 
town, Colo 117 
8.  Horizontal  plan  of  vein  in  one  of  tunnels  of  the  Maine  mine, 
Georgetown,  Colo 117 
9.  Types  of  quartz  bodies  at  Goldfield,  Nev 135 
10.  Vertical  cross  sections  of  quartz  bodies  at  Goldfield,  Nev 136 
11.  Sketch  map  showing  location  of  gold  placers  and  coal  deposits  in 
Clallan  County,  Wash 154 
12.  Sketch  map  showing  location  of  Carolina  tin  belt 189 
13.  Map  of  eastern  Utah,  showing  location  of  vanadium  and  uranium.  201 
14.  Production  and  consumption  of  copper  in  various  countries  _ 212 
15.  Sketch  map  showing  location  of  the  Cactus  mine,  Utah 243 
16.  Index  map  showing  position  of  Coeur  d'Alene  district,  Idaho 276 
17.  Preliminary  geologic  map  of  the  Coeur  d'Alene  district 279 
18.  Plan  of  veins  in  the  Helena-Frisco  mine,  Coeur  d'Alene  district. . .  295 
19.  Section  through  the  Bunker  Hill  and  Sullivan  lode,  Coeur  d'Alene 
district 296 
20.  Sketch  map  of  part  of  Warrior  coal  basin,  Alabama 358 
21.  Map  of  the  Muscogee  oil  field,  Indian  Territory 442 
22.  Map  of  northern  Utah,  showing  location  of  oil  and  asphalt  pros- 
pects   469 
23.  Map  of  the  valley  of  Virginia  from  Woodstock  to  Staunton 532 
24.  Map  of  the  valley  of  Virginia  from  Staunton  to  Natural  Bridge.  _ .  533 
25.  Sketch  map  showing  distribution  of  the  Benton  formation  in 
Wyoming. --- 561 
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