WARMAN. 
PENNSYLVANIA PERIDOTITE.  607 
Pennsylvania!!  series  in  Kentucky GF  47,  p  2 
in  Tennessee - .GF  53,  p  3 
Penobscot  River,  profile  of WS  44,  p  9 
Penobscot  River  and  tributaries,  Maine,  water  power  of Ann  19,  iv,  pp  52-65 
Penokee  district,  Michigan,  topographic  features  of,  in  relation  to  geology.. Mon  xix, 
pp  145, 188-189,  301-302 
Penokee  Huronian  rocks,  character  and  thickness  of Ann  3,  pp  165-166 
Penokee  series  of  Michigan  and  Wisconsin Ann  10,  i, 
pp  341-507;  Mon  xix;  Bull  86,  pp  150-154, 187-189,  passim 
cherty  limestone  of Vim  10,  i.  pp  349,365  -369 
iron-bearing  member  of Ann  10,  i,  pp  349,  380-422 
quartz-slate  of - Ann  10,  [,pp  :54<),  370  379 
upper  slate  of bn  10,  i,  pp  349,  423-435 
Penokee-Gogebic  <  list  rid,  Michigan,  iron  ore  in Inn  21,  in,  pp  337-351,  427-428 
Penrose  (R.  A.  F.),  jr.,  mining  geology  of  Cripple  <  'reck  district.  Colorado \nn  16, 
ii,  pp  Lll-209;  GF  7.  p  8 
nature  ami  origin  of  deposits  of  phosphate  of  lime,  with  introduction  by 
N.S.Shaler Bull  Hi 
quoted  on  lignite  beds  of  Texas MR  L891,  pp  327-328 
Pentacrinidse,  Mesozoic,  of  United  States Bull  97,  pp  25  29 
Pentametaphosthimic  acid,  constitution,  salts,  decomposition  products,  etc. 
of Bull  L67,  pp]  12-148 
Pentaphosponitrilic  chloride,  analysis  of Bull  L67,  p  131 
IVoria n  soil  in  Danville  quadrangle,  Illinois-Indiana GF  67,  p  5 
Peorian  soil  and  weathered  /one  |  Toronto  formation?  I Mon  xxxvm,  pp  L85   L90 
Perak,  tin  deposits  and  industry  of Ann  1(5,  in,  pp  4ti(.i    176 
Percolation  of  underground  waters  of  Great  Plains,  rate  of Vnn  Hi,  n.  |>|>  .V>i;  557 
of  water  into  undisturbed  field  soil \nn  L9,  ei, pp  200-264 
Perezonal  formations Bull  84,  pp  98  99 
Peridot,  occurrence  and  statistics  of MR  L882,  p  19?;   MR  L883  84, 
P  781;  MR  1SS5,  p  443;  MR  1886,  p  604;  MR  L891,  p 
540;  MR  1892,  p  781;  MR  L893,  p  681;  Ann  16,  iv,  p  604; 
Ann  17,  in  cont,  p  923;  Ann  IS,  v  cont,  p  1217;  Ann  It),  \  i 
cunt,  p  513;  Ann  20,  vi  cont,  p  599;   Ann  21,  vi  cont,  p  461 
Peridotite,  analysis  of,  from  California,  Bidwell  Bar  quadrangle Ann  17, 
i,  p  577,  Bull  14S,  p  205;  Bull  16S,  p  191 
analysis  of,  from  California.  Downieville  quadrangle Ann  17,  i,  p  651 
fiotn  Colorado,  Cottonwood  Gulch Vnn  17, 
ii,  p  284;  Bull  148,  p  165;  Bull  16S,  p  147 
from  Kentucky,  Elliott  County Bui  1  38, 
pp  24-25;* Bull  42,  p  136;  Bull  14s.  p  92;  Bull  168,  p  56 
Elliott  County,  slaty  inclusion  in Bull  42,  p  137 
from  Maryland,  near  Howardville  (feldspathic) Bull  28, 
p  54;  Bull  150,  p  290 
from  Massachusetts,  Belchertown Bull  148,  p  74,  Bull  168,  p  30 
from  Michigan,  Crystal  Falls  district Mon  xxxvi,  pp  259,  263 
near  Opin  Lake.  sec.  27,  T.  48  N.,  R.  27  W Ann  15, 
p  511,  Mon  xxvui,  p  186;  Bull  148,  p  98;   Bull  168,  p  64 
from  Montana,  near  Red  Bluff Bull  90, 
p  70;  Bull  148,  p  140;  Bull  168,    p  114 
from  New  York,  Dewitt...Mon  xxxvi,  p  219;  Bull  148,  p  79;  Bull  168,  p  38 
from  Oregon,  Douglas  County Bull  148,  p  231;  Bull  168,  p  220 
from  Maryland,  Sudbrook  Park,  description  of,  as  one  of  the  educational 
series Bull  150,  pp  288-290 
