506 
INDEX. 
Page. 
Williams  Fork  Mountains,  Colo.,  coal  field 
in  232-235 
coal  of.  analyses  of 232-234 
section  of 233 
Willitt  Crook,  Wyo. .  gold  on 308 
Willow  Creek,  Wyo.,  coal  at 337 
coal  at,  analysis  of 340 
Wilsons  Camp.  Nev.,  ore  deposits  at 69 
Wilton,  X.  Dak.,  lignite  at,  analysis  of 323 
W  inchell,  II.  V.,  on  Alaska  copper 98 
Wingo,  Ky..  clay  near,  analysis  of 421 
Winslow,  Ky.,  coal  at .  sections  of 265 
Winterquarters,  Utah,  coal  of 298 
coal  of,  analyses  of 288  294 
Wisconsin,  glass  sand  from 462-463,471-472 
glass  sand  from,  analyses  of 462  463 
Wise  bank,  Colo.,  coal  of 234 
Wolf  ('reek.  Wyo.,  copper  on 308 
Wolf  Creels  Valley,  Colo.,  coal  of 235  236 
coal  of,  analyses  and  sect  ion  of 236 
Wolf  Mountain,  Colo.,  coal  of 236-239 
Woodruff  mine.  \\  j  o  .  coal  of 312 
Woolsey.  L.  II.,  on  volcanic  ash  near  Du- 
rango.  Colo 476-478 
work  of 47ii 
Wuth,  Otto,  analysis  by 263 
Wylam,  Ala.,  coal  at,  section  of 217 
Wyoming,  asphaltum  in 310 
bentonite  in 309,312  313,445  147 
building  stone  in 309 
coal  in 205,303  307,311  312, 
analyses  of 339-341 
copper  in 123  KM, 308-309 
gold  and  si  her  in 95 
produi  tion  of     •      93 
gas  in 314 
geology  Of 331-336 
gold  in 95,307  308 
gypsite  in 405 
gypsum  in 309,313-314,404-405 
analysis  of 405 
sections  of 404 
Page. 
Wyoming,  iron  ores  of 194-195, 199-200 
lignite  in 316 
limestone  in 309 
mineral  water  in 314-315 
minerals  in 303-310 
oil  wells  in 345-348 
pet  roleimi  in L0.r>, 309-310, 314, 342-353 
analyses  of 351-352 
phosphate  in 309 
section  in 332-334 
sulphur  in 315 
Uinta  County,  coal  and  oil  in 331-353 
coal  Held  of.  map  showing 336 
geologic  map  of 342 
underground  water  in 3,r>3 
work  in 22,l,().">,l,oc, 
Wyoming    Coal     and     Coking    Co.,     Wyo., 
mine  of 336 
Y. 
Yampa  coal   field,  Colo.,  anthracite  in...   236-239 
anthracite     in.      See    also    Anthracite 
field. 
coals  Of 228-239 
descripl  ion  of 226-227 
ge,  ilogy  of 227-228 
work  in 22 
Yampa  River,  coal  field  on 234 
coal  field  on.  map  of 226 
local  ion  and  character  of 226 
Yarn i out  h.  Me.,  graphite  near 481-482 
young's  ranch,  X.  Dak.,  lignite  near 326 
Yule,  X.  Dak,  lignite  near,  section  of 325 
/inc.  bibliography  of 170 
occurred  e  of 19,37,46,79-80, 166-169 
ores  of,  origin  of 168  169 
production  of 166 
See  also  X"e\  ada. 
Zircon,  occurrence  of,  in  black  sands J52-l.r>6 
