(U() 
INDEX. 
Page.     | 
Petroleum,  from  Texas  and  Louisiana,  char- 
acter of 407 
in  Trans- Pecos.  Texas,  occurrence  and 
character  of 580  584 
papers  on  natural  gas,  asphalt,  and..  436   185 
prospects  of,  in  Utah 468-473,477-479 
publications  on,  list  of 484-485 
Phillips,  W.  P.,  on  Texas  petroleum 580 
Phonolitic  breccia,  occurrence  of 89 
Phosphates  and  other  mineral  fertilizers, 
publications  on,  list  of 594-595 
Pickensville,  Ala.,  well  at,  log  of 517 
Pilot  mine,  Cal.,  veins  of 48 
Piqua  limestone,  analyses  of 509 
character  and  thickness  of 447 
Pirsson,   L.  V.,  and  Weed,  W.   H.,  on  ore 
deposition  at  hot  springs 600 
Pittsburg     coal     in    Burgettstown    quad- 
rangle, Pa.,  position,  character 
etc. ,  of 402-410 
l'l;i<'cr  deposits,  source  of 34-35 
Placers,  gold  derived  from .' 34-35 
silver  obtained  from 40 
Platinum,  publications  on 196 
Platteville  limestone,  section  of,  in  Wiscon- 
sin       313 
Podozamites  crassifolia,  occurrence  of 226 
Pointer  mine,  Colo.,  ores  of 91 
Polybasite,  occurrence  of 100 
Pony  Express  mine,  Colo.,  ores  of 61,71-73 
Porphyritic  granite,  occurrence  of,  in  Colo- 
rado        103 
Pi  .rphyry,  occurrence  of 51, 53, 66, 104-106 
Porphyry,  felsitic,  Colorado,  character  of ..  105 
Porphyry,  glassy,  Colorado,  occurrence  of. .  105 
Porphyry,  granitic,  Colorado,  character  of..  105 
Porphj  ry,  obsidian,  Colorado,  occurrenceof  105 
Portland,  Oreg.,  coal  in  Washington  near.  411-412 
iron  ore  (so-called)  near 343-347 
Portland  amphitheater,  Colo.,  veins  in 58,637 
Portland  cement.     See  Cement. 
Portland  mine,  Colo.,  ores  of 91,94 
Portugal,  tin  in,  occurrence  of 177 
tin  in,  publication  on 185 
Posepny,  F.,  on  copper  deposits 223 
Pot(  »si  g  r<  ni]  >,  occurrence  and  character  of.  234, 259 
ores  of 260 
Potosi  limestone,  correlation  of 234 
Pottery   industry  in  Independence    quad- 
rangle, Kans 549 
Prairie  Rock,  Miss.,  limestone  near,  analy- 
sis of 515 
Pratt,  J.  H.,  on  steel-hardening  metals 197 
Pratt  coal,  occurrence  and  thickness  of..  371-372 
Pre-Cambrian  rocks,  gold  derived  from 35 
Prichard  slate,  character  and  extent  of..  280-281 
Proctor  limestone,  correlation  of 234 
Professional  papers,  character  of 12 
Pulaski,  Va.,  spelter  plant  at 268 
zinc  a1 269, 273 
Purington,  A.  V.,  on  ores  of  Colorado 123 
Puzzolan  cement.    See  Cement,  Puzzolan: 
Puzzuolana,  use  of 503 
Pyrite,  analysis  of 588 
occurrence  of,  in  Idaho 297 
in  Colorado 103-104 
Page. 
Pyrite  deposits  of    western    Adirondacks, 
paper  on 587-588 
Pyrite  and  sulphur,  papers  on 587-592 
publications  on,  list  of 593 
Pyrrhotite,  occurrence  of,  in  Idaho 297 
Q. 
Quartzite,  replacement  ores  in 55, 65-71 
character  and  genesis  of 65 
inclosing  rocks  of 65-66 
mines  on 66 
Quartzose  ores,  gold  production  of 35-37 
silver  production  of 40-41 
Quaternary    rocks,    use    of,   for    Portland 
cement 501 
Queensland,  tin  in,  occurrence  of 170 
tin  in,  publications  on 183 
Quicksilver,  publications  on 196 
Quilby  Creek,  Miss.,  rocks  on 513-514 
Quinnimont  coal,  occurrence  of 42 1 
Ransome,  F.  L.,  on  the  Bachelor  mine 60 
paper  by,  on  ore  deposits  of  the  Coeur 
d' Alene  district,  Idaho 274-303 
reconnaissance  by 227-228 
work  of 26 
Ransome,  F.  L.,  and  Lindgren,  Waldemar, 
paper  by,  on  Cripple  Creek  dis- 
trict, Colo 85-98 
Ream  coal,  occurrence  of 376 
Red  Beds,  copper  in 221-232 
Red  Wall  limestones,  occurrence  of 229, 230 
"  Resin  zinc,"  occurrence  of,  in  Colorado.  107, 110 
Revett  quartzite,  Idaho,  character  and  ex- 
tent of 281 
Rhyolite,  occurrence  of 78-79 
Richardson,  G.  B.,  paper  by,  on  natural  gas 
near  Salt  Lake  City,  Utah 480-483 
paper  by,  on  salt,  gypsum,  and  petro- 
leum in  Trans-Pecos,  Tex 573-585 
on  sulphur  deposits  in  Texas 589-592 
Richardson,  Utah,  vanadium  and  uranium 
near  203-207 
Richville,  N.  Y.,  pyrite  mine  at 588 
Rico  mines,  Colo.,  zinc  from 271 
Ripley  formation,  occurrence  and  charac- 
ter of  511 
Road  metal,  papers  on,  list  of 493 
Roberts,  W.  A.,  iron  ore  (so-called) exhibited 
at  Portland,  Oreg.,  by 343, 345 
Rock,  A.  M.,  work  of 85 
Rock  Castle,  Ala.,  section  at 376 
Rock  of  Ages  mine,  Colo.,  character  of 66 
Rombauer,  A.  C,  assays  of  pyrite  by 129 
Rosendale  cement,  composition  of 501 
Ross  tin  mine,  N.  C,  developments  at 193 
Rossville,  Ga.,  natural  cement  at 501 
Roubidoux  formation,  copper  in 235 
occurrence  and  character  of 234 
Rozel  Hills,  Utah,  oil  and  asphalt  prospects 
at  468,  470,  473,  474 
Ruby  claim,  Colo.,  ore  deposits  at 127 
Ruby  silver,  occurrence  of 100 
