252  INDEX    TO    PUBLICATIONS    OF    U.    S.    GEOL.    SURVEY,     [bull.  177. 
Concretion,  calcareous,  description  of  the  rock,  as  one   of  the  educational 
series Bull  150,  pp  107-108 
in  Champlain  clays  of  Massachusetts Mon  xxix,  pp  711-718 
Concretion,  ferruginous,  description  of  the  rock,  as  one  of  the  educational  series 
Bull  150,  pp  108-110 
Concretion,  marcasite,  description  of  the  rock,  as  one  of  the  educational  series Bull 
150,  pp  110-111 
Concretions,  analysis  of Mon  xm,  p  65 
in  sandstone,  origin  of Mon  xiii,  pp  64-68 
Conduction,  heat,  investigations  in Ann  14,  i,  p  164 
Conejos  River,  Colorado,  flow  of,  measurements  of WS  37,  pp  278-279 
Conference  of  geologists  and  lithologists  on  geologic  nomenclature  and  map 
notation,  in  January,  1889 Ann  10,  i,  pp  56-67 
Congaree  River,  profile  of WS  44,  p  27 
Congeria  beds  of  Europe,  eastern,  correlation  of Ann  18,  n,  p  338 
Conglomerate,  analysis  of,  from  Massachusetts,  Marlboro Bull  148, 
p77;  Bull  168,  p  33 
description  of  the  rock,  as  one  of  the  educational  series Bull  150,  pp  70-72 
faulted  pebble  of  Cretaceous,  description  of,  as  one  of  the  educational  series Bull 
150,  pp  316-317 
metamorphic,  from  Hoosac  Mountain,  Massachusetts,  description  of,  as  one 
of  the  educational  series Bull  150,  pp  323-325 
thin  section  of,  from  Massachusetts,  Hoosac  Mountain  (metamorphic) Mon 
xxiii,  pp  116-117 
from  Massachusetts,  Stone  Hill,  Williamstown  (quartzite) Mon  xxiii, 
pp  116-117 
from  New  York,  Ashley  Hill  (limestone) Ann  13,  n,  p  313 
from  Vermont,  Bird  Mountain Ann  13,  n,  p  338 
volcanic,  in  Maine,  Aroostook  volcanic  area Bull  165,  pp  127-131 
Conglomerates,  andesitic  pebbles  of,  in  Denver  Basin Mon  xxvn,  pp  315-316 
basal,  formation  of,  and  phenomena  liable  to  be  mistaken  for Ann  16, 
i,  pp  721-724 
Carboniferous,  as  products  of  glaciation Mon  xxxm,  pp  64-67 
evidence  from,  as  to  periods  of  metamorphism Ann  19,  n,  pp  417-418 
of  Keweenaw  series,  description  of Mon  v,  pp  127-133 
record  value  of Mon  xxxm,  pp  59-61 
Conglomerate  formation  of  Michigan,  Sturgeon  River  tongue Ann  19, 
in,  pp  148-149;  Mon  xxxvi,  pp  471-479 
Conglomerate  series  of  West  Virginia,  name  proposed Bull  80,  p  93 
Congress,  international,  of  geologists,  fifth  triennial  session,  at  Washington,  in 
August,  1891. Ann  13,  i,  p  128 
Conichalcite,  analysis  of,  from  Spain Bull  20,  p  84 
analysis  of,  from  Utah,  Tintic  district Ann  19,  in,  p  699;  Bull  20,  pp  84-85 
Conidse  from  clays  and  marls  of  New  Jersey Mon  xvm,  pp  221-222 
Conifene  of  Alaska Ann  17,  i,  pp  878-880 
of  Amboy  clays Mon  xxvi,  pp  46-62 
of  Coal  Measures,  Lower,  of  Missouri Mon  xxxvn,  pp  271-274 
of  Cretaceous  of  Black  Hills Ann  19,  n,  pp  644-645,  668-687 
of  Dakota  group Mon  xvn,  pp  32-36 
of  Laramie  group Bull  37,  pp  14-16 
of  Mesozoic,  <  >f  California Ann  20,  n,  pp  362-363 
of  Mesozoic,  older,  of  North  Carolina Ann  20,  n,  pp  304-310 
of  Virginia Mon  vi,  pp  85-89 
of  North  America,  extinct Mon  xxxv,  pp  17-27 
