626  INDEX    TO    PUBLICATIONS    OF    U.    S.    GEOL.    SURVEY,     [bull.  177. 
Pleurotomariidse  from  Colorado  formation Bull  106,  p  161 
from  Miocene  deposits  of  New  Jersey Mon  xxiv,  pp  114-117 
Pliocene,  boundaries  of Bull  84,  p  22 
origin  of  name Bull  84,  p  333 
(See,  also,  Neocene.) 
Pliocene  fossils  of  Oregon Ann  17,  i,  pp  476,  477,  478 
Pliocene  period,  definition  and  features  of Bull  84,  p  22 
Pliocene  rocks;  Auriferous  gravels  of  California Bull  84,  pp  219-222 
of  Alaska .....: - - Bull  84,  pp  259-267 
of  Atlantic  slope,  middle Bull  141,  pp  32-33 
of  California Mon  xm,  pp  219-221,  461 
of  Colorado Bull  84,  pp  305-308 
of  Florida Bull  84,  pp  127-134, 140-149 
of  Georgia Bull  84,  pp  84-85 
of  North  Carolina Bull  84,  p  74 
of  Oregon,  northwestern Ann  17,  i,  pp  476-478 
of  South  Carolina Bull  84,  pp  80-81 
of  southern  Atlantic  coast,  geologic  history  of Bull  84,  pp  191-193 
of  Virginia Bull  84,  pp  66-67 
(See,  also,  Neocene.) 
Pliohippus  beds  in  Denver  Basin Mon  xxvn,  p  480;  Bull  84,  p  333 
Plombierite,  chemical  constitution  of Bull  125,  pp  82-105 
Plum  Creek  Timber  Land  Reserve;  boundaries,  timber,  fires,  mining,  lumber- 
ing, etc.,  in Ann  20,  v,  pp  3-6,  74-86 
Plummer  (F.  G. ),  Mount  Rainier  Forest  Reserve,  Washington.  .Ann  21,  v,pp  81-143 
Pocahontas  formation  of  Virginia  and  West  Virginia GF  26,  p  3;  GF  44,  pp  3,  4-5 
Pocahontas  quadrangle,  Virginia- West  Virginia,  geology  of GF  26 
Pocatello  irrigation  canal,  Idaho,  surveys  for Ann  13,  in,  pp  422-427 
Pocono  sandstone  of  Maryland,  Virginia,  and  West  Virginia GF  14, 
pp  2-3;  GF  28,  p  3;  GF  32,  pp  3-4;  GF  34,  p  2;  GF  61,  pp  4-5 
Pcecilopoda  from  middle  Cambrian  of  North  America Bull  30,  pp  54-58, 149-222 
from  Nevada,  Eureka  district Mon  vin,  pp  24-64, 
89-98,  207-211, 266-267;  Monxx,  pp321, 323-324, 325, 330, 333 
Pogonip  limestone  of  Nevada,  age,  character,  and  thickness  of Ann  3, 
p  253;  Mon  vn,  p  8;  Mon  xx,  pp  48-54 
features  and  fossils  of Ann  3,  pp  260-262 
fauna  of Mon  xx,  pp  49-54 
Poikilitic  structure  of  igneous  rocks  of  Michigan Bull  62,  pp  78,  79, 183, 196 
of  igneous  rocks  of  Yellowstone  Park Mon  xxxn,  n,  passim 
Point  Gardner,  Alaska,  coal  near Ann  17,  i,  p  773 
Point  of  Rocks  group  of  Uinta  Mountains Bull  82,  p  235;  Bull  83,  p  121 
Poison  Canyon  series  of  Colorado Bull  84,  p  333 
Poison  Canyon  formation  of  Colorado GF  68,  p  2 
Pokegama  formation  of  Lake  Superior  region Ann  21,  in,  pp  357-358 
Pollock  ( W.  C.) ,  digest  of  decisions  relating  to  use  and  control  of  water  in  the 
arid  region.     (See  p  113  of  this  bulletin. ) 
Pollucite,  chemical  composition  of Bull  125,  p  31,  103 
Pollution  of  Naugatuck  River,  Connecticut WS  22,  pp  21-22 
of  Potomac  River Ann  19,  iv,  pp  134-146, 147-149, 153, 155, 156-161 
of  Quinnipiac  River,  Connecticut WS  22,  pp  20-21 
of  Shenandoah  River Ann  19,  iv,  pp  136-139, 156-161 
of  streams,  discussion  of WS  3,  pp  18-23;  WS  22,  pp  15-22 
Polybasite,  analysis  of,  from  Colorado,  Aspen  mining  district Mon  xxxi,  p  225 
Polycrase,  analysis  of,  from  North  Carolina,  Henderson  County Bull  74,  p  75 
