594  INDEX    TO    PUBLICATIONS    OF    U.    S.    GEOL.    SURVEY,      [bull.  177. 
Oregon;  Umatilla  River,  irrigation  from Bull  131,  pp  69-73 
Umpqua  Mountains,  topographic  features  of Ann  21,  v,  pp  227-228 
water  supply  of,  for  irrigation  purposes Ann  16,  n,  p  522 
Willamette  River,  profile  of WS  44,  p  98 
woodland  area  of Ann  19,  v,  p  12 
Oregon  beds  of  Oregon Bull  84,  p  332 
Orendite,  analyses  of,  from  Wyoming,  Leucite  Hills Bull  150,  p  190;  Bull  168,  p  86 
from  Wyoming,  Leucite  Hills,  description  of,  as  one  of  educational  series Bull 
150,  pp  186-191 
Oreodon  beds  of  South  Dakota Bull  84,  pp  332,  336 
Organic  matter  an  agent  in  formation  of  concretions  in  sandstones Mon  xni, 
pp  64-68 
Organic  pr<  >cesses  •  >f  soil  formation Ann  12,  i,  pp  268-287 
Organization  of  United  States  Geological  Survey Ann  8, 
i,  pp  3-69;  Ann  21,  i,  pp  19-22,  60-61 
Organosols,  chemical  researches  in Bull  113,  pp  95-98 
Original  Huronian  rocks  of  Canada  and  Great  Lakes  region.     (See  Algonkian; 
Huroniau;  Laurentian.) 
Original  Laurentian  rocks  of  Canada  and  Great  Lakes  region.      (See  Laurentian. ) 
Oriskany  Creek,  New  York,  flow  of,  measurements  of WS  35,  pp  47-48 
Ornithomimidre  of  North  America Ann  16,  i,  pp  203-206 
Ornithomimus,  description  of Ann  16,  i,  pp  204-206 
from  Denver  Basin,  remains  of ,r Mon  xxvn,  pp  518-520 
Ornithopoda,  distribution  of Ann  16,  i,  p  226 
Orogenic  action  and  history  in  Narragansett  Basin Mon  xxxm, 
pp  7,  8,  9-10,  20-25,  32-36 
Orogenic  movements  in  Alaska Ann  20,  vn,  pp  185,  311,  400-404 
in  Mesocarboniferous  of  Missouri Mon  xxxvn,  p  8 
in  New  York,  Rensselaer  Plateau  region Ann  13,  n,  p  335 
in  Sierra  Nevada,  evidence  of  lava  flows .Bull  89,  pp  69-70 
obliteration  of  evidence  of  unconformity  by Ann  16,  i,  pp  731-732 
Orogeny,  discrimination  of,  from  epeirogeny Mon  i,  p  340 
(See,  also,  Diastrophism. ) 
Orographic  blocks  in  Connecticut,  Pomperaug  Basin Ann  21,  in,  pp  104-121 
in  Nevada,  Eureka  district Mon  xx,  pp  10-11, 19-30 
Orographic  history  of  Bonneville  Basin Ann  2,  p  198 
Orographic  movements  in  Colorado,  Telluride  quadrangle GF  57,  p  14 
in  Great  Basin,  recent Ann  2,  p  232;  Ann  3,  p  453 
post-Lahontan ' Ann  3,  pp  232-233;  Mon  xi,  pp  274-283 
(See,  also,  Diastrophism.) 
Orthaulax  bed  of  Florida Bull  84,  pp  112, 113-114,  332 
Orthite  in  granite,  thin  section  of,  from  Michigan,  Horse  Race  Rapids.  .Bull  62,  p  117 
Orthoclase,  analysis  of,  from  Colorado,  Leadville  region  (pink  crystals  of)  ..Mon  xn, 
p  333;  Bull  148,  p  173;  Bull  168,  p  155 
analysis  of,  from  Minnesota,  Pigeon  Point  (soda) Bull  55,  p  82 
from  North  Carolina,  Iredell  County Bull  74,  p  57 
chemical  constitution  of Bull  125  pp  28,  39,  43,  44, 101 
Orthoclase  and  albite,  mixed,  analysis  of,  from  New  Hampshire,  Moulton- 
boro Bull  148,  p  67;  Bull  168,  p  23 
Orthoclase  and  microcline,  mixed,  analysis  of Bull  150,  p  207 
Orthoclase-gabbro,  thin  section  of,  from  Lake  Superior  district... Ann  3,  pp  104-105 
thin  section  of,  from  Michigan,  Lac  La  Belle,  Keweenaw  Point.  .Mon  v,  pp  50-51 
from  Minnesota,  near  Duluth Mon  v,  pp  52-53 
