628  INDEX    TO    PUBLICATIONS    OF    U.    S.    GEOL.    SURVEY,      [bpll.177. 
Porphyritic  red  rock,  thin  section  of,  from  Minnesota,  Pigeon  Point. Bull  109,  pp  54-55 
Porphyroid,  analysis  of,  from  Wisconsin,  Menominee  River Bull  55,  p  81 
Porphyroids,  schistose  porphyries  or,  of  Michigan Ball  62,  pp  119-722 
Porphyry,  analysis  of,  from  California,  Knoxville Mon  xm,  p  144 
analysis  of,  from  Colorado,  Iron  Hill Mon  xu,  pp  326,  589 
from  Colorado,  Leadville,  vicinity  of Mon  xu, 
pp  332,  589;  Bull  148,  p  173;  Bull  168,  p  155 
Leadville  district  (alteration  products) Mon  xu,  p  603 
(altered  white) Mon  xu,  p  607 
Mount  Lincoln Mon  xu,  pp  332-589;  Bull  148,  p  172;  Bull  168,  p  154 
Mount  Zion Mon  xu,  pp  326,  589;  Bull  148,  p  1 72;  Bull  168,  p  154 
from  Germany,  Muldenstein Ann  19,  vi  cont,  p  412 
.  from  Michigan,  Upper  Quinnesec  Falls  (schistose) Bull  62,  p  120, 121 
from  Minnesota,  Pigeon  Point  (red) Bull  64, 
p  46;  Bull  109,  p  58;  Bull  148,  p  107;  Bull  168,  p  77 
from  Montana,  Big  Baldy  Mountain Ann.  20,  in,  p  511 
Castle  Mountains Bull  139,  p  106 
from  Missouri,  near  Ironton Bull  148,  p  95;  Bull  168,  p  59 
from  New  Mexico,  Los  Cerrillos Bull  42,  p  43 
from  Utah,  Henry  Mountains Bull  60, 
p  154;  Bull  148,  p  183;  Bull  168,  p  167 
in  California,  Downieville  quadrangle GF  37,  p  4 
in  Colorado,  Cripple  Creek  district  (augite-syenite) Ann 
16,  ii,  pp  45-46,  66,  93 
La  Plata  quadrangle GF  60,  pp  8-9 
Mosquito  Range Ann  2,  pp  222-224,  243-244 
Rico  Mountains,  associated  with  the  monzonite Ann  21,  u,  pp  83,  88-90 
Tenmile  district GF  48,  p  2 
in  Lake  Superior  region,  Keweenaw  series  (quartziferous) Ann  3,  pp  113-114 
(quartzless) Ann  3,  pp  112-113;  Mon  v,  pp  91-95 
in  Montana,  Fort  Benton  quadrangle GF  55,  p  3 
Little  Belt  Mountains  (acidic  feldspathic) Ann  20,  in,  pp  498-525 
Little  Belt  Mountains  quadrangle GF  56,  p  3 
microscopic  petrography  of Bull  139,  pp  97-109 
in  South  Dakota,  Black  Hills  (intrusive) Ann  in,  pp  182-194 
in  Utah,  Mercur  district Ann  16,  n,  pp  377-381,  434 
in  Yellowstone  Park Mon  xxxn,  u,  pp  94-97 
reservation  of  the  term,  for  the  designation  of  rock  structure Ann 
19,  i,  p  22;  Ann  21,  n,  p  95 
thin  section  of,  from  Colorado,  Chalk  Mountains  (white) Mon  xn,  pp  88-89 
from  Michigan,  Eagle  Harbor  sandstone Ann  5,  p  239 
from  Minnesota,  Baptism  River  Point  (quartziferous)  ...Mon  v,  pp  100-101 
Carp  River  (felsitic) Mon  v,  pp  100-101 
Duluth  (granitic) .Mon  v,  pp  112-113 
Eagle  Mountain  (granitic) Mon  v,  pp  112-113 
Great  Palisades Mon  v,  pp  100-101 
Rice  Point  (granitic) Mon  v,  pp  112-113 
from  Ontario,  Bead  Island  (quartziferous) Mon  v,  pp  100-101 
Michipicoten  Island  (quartziferous) Mon  v,  pp  100-101 
from  Wisconsin,  Ashland  County,  Ironton  trail  (granitic) .  .Mon  v,  pp  114-115 
Porphyry  dikes  and  intruded  sheets  of  Montana,  Castle   Mountain   mining 
district Bull  139,  pp  64-69 
Porphyry,  granitic.     (See  Granitell. ) 
Porphyry- trachyte,  dikes  of,  in  Lake  Cham  plain  region Bull  107,  pp  18-22 
