524 
INDEX. 
Page. 
Lower  Hignite  coal,  occurrence  and  thick- 
ness of 262 
Lower  Freeport  clay,  occurrence  and  thick- 
ness of 472 
Lower  Freeport  coal,  analysis  of 301,302 
mines  working 302-306 
occurrence  and  thickness  of 300-301 
Lower  Kittanning  clay,  analyses  of 471 
occurrence,   thickness,   and    character 
of 469-472 
Lower  Kittanning  coal,  analysis  of 309 
mines  working 310 
occurrence  and  thickness  of 308-309 
M. 
McCreath,  A.   S.,  and  d'Invilliers,   E.   V., 
cited  on  Cumberland  Gap  coal 
field 268 
McKinley,  Mount,  Alaska,  gold-placer  min- 
ing near 48 
McKinley  Creek,  gold-placer  mining  on  . . .  62, 63 
Maine,  ores  in  quartz  from,  assays  of 84 
quartz  veins  in,  supposed  to  contain 
gold 81-85 
Manganese,  papers  on,  title  of 238-239 
Manion  coal   mine,   Pennsylvania,  opera- 
tions at , 299, 303 
Marble,  analyses  of,  from  Alabama 433 
Marquette  district,  Michigan,  iron  ore  de- 
posits of 217 
Martin,  G.  C,  paper  by,  on  petroleum  fields 
of  Alaska  and  Bering  River  coal 
fields 365-382 
work  of 26 
Mary  gold  mine,  Nevada,  operations  at. .  112-113 
Meadow  Branch  coal  field,  West  Virginia, 
coal  of 336-342 
development  of 342-344 
geology  of 332-336 
location  of 330-332 
map  of 331 
sections  in 337, 338, 339 
Meeteetse  district,  Wyoming,  coal  in 348-354 
sections  in 350, 351, 352, 353 
Mellor,  N.  H.,  acknowledgments  to 242 
Mendenhall,  W.  C,  cited  on  Alaskan  geol- 
ogy          44 
professional  paper  on  Alaskan  geology 
by,titleof 18 
Mendenhall,  W.  C,  and  Schrader,   F.  C, 
cited  on  Alaskan  geology 47 
professional  paper  on  Alaskan  geology 
by,  title  of 18 
Mendenhall,  W.  C,  and  others,  cited  on 
Alaskan  geology 52 
Menominee  district,  iron  ore  deposit  in..  215-217 
Mesabi  district,  iron  ore  deposits  of 218 
Metalliferous   deposits,   investigations    of, 
summary  report  on 18-24 
publications  on,  during  1903,  titles  and 
descriptions  of 18-19 
in  preparation,  titles  of 19-20 
work  on,  in  progress 20-24 
Mica,  publications  on,  list  of 518 
Michigan,  iron  ores  in 215-218 
Page. 
Mineral  resources  of  the  United  States,  re- 
ports on,  character  and  distri- 
bution of 16-17 
Mingo  coal,  occurrence  and  thickness  of.  264-265 
Missouri  Valley,  lignites  of  upper  and  mid- 
dle    276-288 
Mitchell's  coal  mines,  Pennsylvania,  opera- 
tions at 303 
Mizpah  mine,  Nevada,  veins  and  ores  in, 
features  of 102, 103-107 
Moffit,  F.  H.,  paper  by,  title  and  descrip- 
tion of 21 
Monographs  of  U.   S.   Geological    Survey, 
character  and  distribution  of  . .  12-13 
Monongahela  formation,  occurrence  of 397 
Montana  Tonopah  mine,  Nevada,  ore  ship- 
ments from 90 
veins  and  ores  in,  features  of 102, 103-107 
Mount  Morris  oil  field,  Pennsylvania,  petro- 
leum in 408 
N. 
Natural  gas,  fields  of,  in  Pennsylvania...  392-412 
origin  of,  conditions  governing 405-411 
publications  on,  list  of 413 
Neal  coal,  occurrence  and  thickness  of  . .  267-268 
Nebraska,  lignite  in  northeastern 276-283 
Nephi,  Utah,  rock  gypsum  at,  character  and 
occurrence  of 483-487 
Nevada,  alum  deposit  in 501-502 
coal  in 289-292 
metalliferous  deposits  in,  work  on 23-24 
ore  deposits  in 89-119 
sulphur  mines  in 497-500 
New  Jersey,  cement-rock  deposits  of 448-456 
copper  deposits  in 187-189 
New  Mexico,  coal  in 293-294 
New  York,  graphite  deposits  in 512-514 
Newberry,  J.  S.,  cited  on  iron  ores  of  Utah.      229 
Newton,  Henry,  cited  on  geology  of  Black 
Hills 124 
Nickel,  etc.,  deposits  of 154-168 
papers  on.  titles  of 168 
Nihiser  shaft,  West  Virginia,  coal  in 338 
Nome,  Alaska,  fuel  and  fuel  prices  at 50 
underground  or  drifting  operations  at .  52-53 
wages  and  freights  at 50-51 
North  Dakota,  lignite  in 283-288 
O. 
Oddie,  T.  L. ,  acknowledgments  to 90 
Ohio,  oil  fields  of,  work  in 26 
Ohio  Valley,  Pennsylvania,  clay  industries 
in 477-478 
clays  of 463-480 
Oil.    See  Petroleum. 
Oklahoma,  reported  gold  deposits  in 120-122 
Old  Ironsides  gold  mine,  South  Dakota,  ore 
bodies  of 130-131 
Ores,  metalliferous,  investigation  of,  sum- 
mary report  on 18-24 
work  on,  in  progress 20-24 
Orr  coal  mine,  Wyoming,  coal  at 350 
Orton,  Edward,  cited  on  distribution  of  oil.      388 
cited  on  Lower  Kittanning  clay 471 
