-UU 
indp:x. 
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62-68 
58-60 
57-58 
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173 
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Colorado,  work  in,  on  metalliferous  ores 16-17 
Columbia    River,   black  sands  of,  mineral 
composition  of til 
gold  placers  of 60-70 
distribution  and  amount  of  gold  in.        70 
former  work  on 56 
gold  of,  origin  of 69 
methods  of  mining 
sections  of 
upper  part  of,  geology  of  region  near 
topography  of  region  near 
Columbia  Engineering  Works,  analysis  by  . 
Columbiana,  Ala.,  hematite  near,  analyses 
of 
Columbiana    Mountain.    Ala.,    iron   ore   in, 
occurrence  of 
section  on 173 
Colville  Indian  Reservation,  gold  placers  in, 
investigations  of 56  70 
Comey,  A.  M.,  cited  on  colloidal  clay 280 
cited  on  minerals  in  fuller's  earth 269  270 
Compton,  Ala.,  mini'  at,  sections  "f  iron-ore 
si  am  at 145 
quarry  at ,  limestone  from,  analyses  of..      249 
Conasauga  Limestone,  analyses  of.     - 255 
description  of 2"> )  255 
Condi t.  i'.  ]'...  analyses  by 177 
Conemaugb  formation,  clays  in 344, 
345,346  347 
section  of 346 
shales  in 346,349,351-352 
Confer,  A..  V.,  coal  bank  of,  clay  al 338 
('up''.    E.    I'..   quoted    on   gypsum    in    NV\\ 
Mexico 260  261 
Copper,  papers  on 93  107 
Survey  publications  on,  lisl  of ins  t09 
Copper  Bell   Klines  Company,  Wyo.,  mines 
and  prospecl  -  <»f in:,  107 
Copper  Bottom  prospect,  Wyo.,  rocks  and 
at 96 
Copper  mines  of  Hartvilie  uplift,  Wyo.,  fig- 
ure showing 192 
Copper  ore,  occurrence  of.  in  Maine 11^  L19 
Corey,  G.  II..  analysis  by 220 
Cornwall   type,  magnetite   deposits   of.   in 
Pennsylvania,  paper  on is.-,  wi 
<  oi  tot  on,  Wyo.,  mica  near 123 
Utah,  sulphur  beds  ,it .  geology 
of 483  187 
sulphur  beds  at,  location  of 483 
ore  of.  character  of Is;    )vs 
origin  of*. 488-489 
paper  on 483-489 
sulphur  from,  analyses  of 488-489 
Coward  Mountain  mine.   \.  ('..  description 
of 414-415 
(ox  &  Davies  mine,  \.  c.,  description  of 415 
Coxville,  Ind.,  glass  sand  at 365,366 
glass  sand  at,  analysis  of 376 
Crafts.  W.,  analyses  by 170 
Crampton,  C.  A.,  and  Simons,  F.  D.,  quoted 
on  fuller's  earth 279-280,284 
Crawford  Mountains,  Wyo.,  structure  in. . .      453 
Cretaceous    sandstones,    use    of,    as    glass 
sand 378-379 
Creve  Cceur  Lake,  Mo.,  clay  beds  near 320  - 
I 'age. 
cross.  Whitman,  work  of 
Cross,  Whitman.  Howe.  Ernest,  and  Kan 
some.  F.  L.,  cited  on  Silvcrton 
mining  district 20 
Crowell,  lb,  analyses  by 177 
Croydon,  Utah,  phosphates  near 45(1 
Crystal  Palace  claim.  Wyo.,  description  of. . 
Cryolite,  Survey  publications  on 
Cullowhee,  N.  C,  mica  near 
Cumberland  Clay  Company.  Pa.,  operations 
of 32 
Cumberland  Valley,  Pa.,  geology  of 
Cunningham  Gap,  AJa.,  geologic  section  at.  Ill  11 
Cushman,  A.  S.,  cited  on  colloids  and  pec- 
toids 
cited   on  effect    of  water  on   rock  pow- 
ders   271,281 
quoted  on  absorption  of  basic  ions  of 
elect  rolyte  by  pectoid  matter.. . 
Cushman.  Ark.,  phosphates  near 
Cyrus  Shepard  mine.  Pa.,  clay  at 
so 
2X3 
.:17 
D. 
Dakota 
sandstone,      use      of,    for     glass 
sand 378-379,381 
I  >ale,   Ma.,  geologic  section  near U. 
quarry  at ,  limestone  at .  section  of 24{ 
Dale.    T.   \\.  paper  by,  on  New  England 
granites 356-358 
work  of 24 
Dana.  .!.   I>..  cited  on  fuller's  earth  .  .  .   Jt.S-270,276 
Darlington.    Ala.,  quarry   near,  limestone 
from,  analyses  of 
I    Darton.    X.    II..   cited    on   geology    of    Xew- 
cael i'  .  Wyo.,  and  vicinity 
\.  lb.  and  smith.  W.  s.  T..  cited 
on  ( rUernsej  formation 
Davis   gold    digi/ings.    Snake    River,    Wyo.. 
operations  at 
Dawson,  E.  M.,  jr.,  acknowledgments  to. . . 
work  of 
Day,  D.T.,  cited  on  electric  reduction  of  iron 
ores 
quoted  on  black  sands  of  Snake  River. 
233 
102 
291 
247 
212 
7s, 
86,87 
Day.  D.  '!'..  and  Richards,  R.  lb.  cited  on 
black  sands  of  Snake  River.    ...         78 
De  Soto.  Ma.,  section  al 291 
DeitZ,  Lewis,  farm  of.  clay  on 33S 
Des  Peres  River,  Mo.,  clay  deposits  near. .  316  31a 
Devonian  sandstones,  use  of,  for  glass  sand.      308 
Devonian  shales,  phosphates  in 404 
Dewey.  ]•'.  P.,  analysis  by 176 
Diatomaceous earth,  imports  of 447 
paper  on 43H-446 
production  of , 440-447 
properties  of 445 
uses  of 446 
work  on  deposits  of 25 
See  also  California,  diatomaceous  earth 
in. 
Diller,  J.  S.,  work  done  in  conjunction  with. .       120 
Dilltown,  Pa.,  cla y  near,  analysis  of 352 
Dolomite    in    Birmingham ,  district,    Ala., 
paper  on 247-255 
