INDEX. 
501 
Ozokerite,  occurrence  of. 
See  also  Asphalt. 
Pag^. 
369-372 
Pace  Canyon,  coal  in 295 
Pacific,  Mo.,  glass  sand  at 467-468 
glass  sand  at,  analysis  of 456-457 
Pacific  coast,  sands  of,  platinum  in 150 
Pacific  Glass  Sand  Co.,  Mo.,  quarry  of 468 
Pacific  region,  work  in 21 
Pacific  White  Sand  Co.,  glass  sand  of 467-468 
Pagosa  Junction,  Colo.,  coal  near,  section  of.      247 
Panther  Canyon,  Utah,  coal  in 296 
Palache,  Charles,  work  of 17 
Paris,  Tenn.,  clay  at 424 
Park  City,  Utah,  copper  ores  of 121-123 
Park  City  mining  district,  description  of, 
publication  of 15 
Park  Range,  geology  of 28 
Parker,  E.  W.,  work  of 203,206 
Paulson,  Richard,  development  by 33 
Pay  shoots,  description  of 38 
Peale,  A.  C,  on  Uinta  Co.,  Wyo.,  coals 336, 
337,338 
Peat,  lignite,  and  coal,  bibliography  of...  354-356 
papers  on 203-354 
Peck,  F.  B.,  work  of - 204 
Peck,  F.  B.,  and  Ashley,  G.  II.,  on  Punxsu- 
tawney     and      Glen     Campbell 
coal  fields 276-279 
Peebles,  Ohio,  iron  ore  at 180 
Pegmatite,  gold  in 55-56 
Pend  Oreille,  Lake,  Idaho,  rocks  on 43-44 
Penn  Chemical  Co.,  copper  mine  of 106 
Pennington  shales,  shales  of 375-376 
Pennsylvania,  Center  County,  clays  of 443 
clays  and  shales  of 442-443 
Clearfield  County,  clays  of 443-444 
coal  in 203-204, 271-279 
Greene  County,  oil  sands  in 361-366 
glass  sand  from 461 
map  of  part  of 272 
oil  sands  in,  identification  of 361-366 
work  in 21-23,203-204 
Pennsylvania  Glass  Sand  Co.,  quarries  of.  473-474 
Penobscot  Bay  region,  Me.,  clays  of 428-431 
clays  of,  analyses  of 430 
geology  of 428-429 
utilization  of 429-431 
Perkins  &  Roekwood  mine,  Colo.,  coal  of, 
section  of 245 
Peru,  Kans.,  glass  making  at 460 
Peryear,  Tenn.,  clays  near 422 
Peter,  A.  M.,  on  Kentucky  clays 420 
Peters, ,  analyses  by 181 
Petroleum,  analyses  of 351-352 
bibliography  of 367 
geologic  relations  of  . .  349-350, 359-360, 362-366 
investigation  of 23 
occurrence  of 309-310, 314, 342-353, 359-361 
quality  of 351-353 
production  of 203 
See  also  California;  Pennsylvania; 
Wyoming,  Uinta  County;  Salt 
Lake  field;  Nineveh  and  Gordon 
Page. 
Petroleum  sands,  identification  of 361-366 
names  of 363-364 
Petroleum  wells,  geology  of 359-360 
list  of 345-348 
location  of,  map  showing 358 
Petroleum  and  natural  gas,   bibliography 
of 367-368 
papers  on 357-366 
Phalen,  W.  C,  on  coal  resources  of  Kenova 
quadrangle 259-268 
on  copper  deposits  near  Luray,  Va. ..  140-144 
on  clays  of  northeastern  Kentucky. . .  411-416 
work  of 21, 143, 180, 204 
Phosphates,  bibliography  of 486 
investigation  of 24 
occurrence  of 309 
Pierre  shale,  gas  from 314 
occurrence  of 316-317 
Pilot  Knob,  Colo.,  coal  near 236-238 
Pinal  district,  Ariz.,  production  of 101 
Pine  Creek  district,    Idaho,    mines    of,    de- 
scriptions of 45-46 
Pinos  Altos,  N.  Mex.,  ores  near 83-84 
Pinson,  Tenn.,  clay  at 425-426 
Pishel,  M.  A.,  work  of 331 
Pittsburg  and  Salt  Lake  Oil  Co.,  well  of 350 
well  of,  oil  of,  analysis  of 352 
Pittsburg  Plate  Glass  Co.,  glass  sand  of..  468-469 
glass  sand  of,  analyses  of 455 
Placers,  gold,  description  of 136-137 
Plasters  and  gypsum,  bibliography  of 406 
papers  on 401-405 
Platinum,  bibliography  of 165 
occurrence  of,  in  black  sands 150-164 
Pleasant  Valley,  Utah,  coal  of 297 
Pool  district,  Colo.,  coal  of 231-232 
coal  of,  analysis  of 230 
section  in 230 
Pope  Valley,  Cal.,  magnesite  in 389 
Porphyry,  copper  in,  occurrence  of 97 
copper  in,  treatment  of   95 
gold  in 32 
occurrence  and  character  of. . .  29-30,35-39,78 
Porter,  Colo.,  coal  at,  analysis  and  stction 
of 243-244 
Porters  Creek  clay,  occurrence  and  charac- 
ter of 420-426 
Portersville,  Ala.,  iron  ores  at 176-177 
iron  ores  at,  analyses  of 177 
sections  of 176-177 
Porterville,  Cal.,  magnesite  at 389-390 
magnesite  at,  analyses  of 390 
Portland  cement.    See  Cement,  Portland. 
Potosi  zinc  mine,  Nev.,  description  of.  .  .  166-169 
ores  of 167-168 
origin  of. 168-169 
investigation  of 19 
Pottertown,  Ky.,  clay  at,  analysis  of 418-419 
Pottsville  formation,  clays  in 411-413,442-444 
coal  in 212, 260 
section  of 212 
Poverty  Bar,  Colo.,  gold  placers  at 31 
Powder  River  (South  Fork),  Wyo.,  petro- 
leum on 310 
Pratt,  J.  H.,  work  of 160 
Pratt  coal,  Ala.,  development  of 214-218 
