798  INDEX    TO    PUBLICATIONS    OF    U.    S.    GEOL.    SURVEY.     [bull.177. 
Uinkaret  Plateau,  Arizona Ann  2,  pp  72,  121-12(3;  Mon  n,  pp  10,  101-121 
Uinta  Basin,  geology  of Ann  17,  i,  pp  920-946 
Unita  fold,  the Ann  9,  pp  692-697 
Uinta  group  of  Utah Ann  18,  n,  p  342;  Bull  83, 
pp  126,  143-146,  Bull  84,  p  336;  Bull  86,  pp  286-289,  505 
Uinta  Indian  Reservation,  Utah,  water  supply  of Ann  21,  iv,  pp  305-330 
Uinta  Mountains,  Archean  and  Algonkian  literature  of Bull  86,  pp  286-289,  505 
pre-Cambrian  rocks  of Ann  16,  i,  pp  820-821 
Uinta  River,  flow  of,  measurements  of WS  37,  pp  288-289,  290-291 
Uinta  sandstone  of  Colorado Ann  9,  pp  687-688;  Bull  86,  pp  287-289 
Uintaite,  analyses  of Ann  17,  i,  pp  919,  920;  Ann  18,  v  cont,  pp  940,  941 
conditions  of  impregnation Ann  17,  i,  p  938 
deposits  of ' Ann  17,  i,  pp  909-949 
uses  of,  in  commerce Ann  17,  i,  pp  947-949 
Uintacrinidse,  Mesozoic,  of  United  States Bull  97,  pp  21-24 
Ulexite,  analysis  of,  from  Nevada,  Esmeralda  County  - Bull  55,  p  59 
Ulke  (T. ),  tin  ore  at  Kings  Mountain,  North  Carolina MR  1893,  pp  178-180 
Ulmacea?  of  Amboy  clays Mon  xxvi,  p  69 
of  Cretaceous  of  Black  Hills Ann  19,  n,  p  689 
of  North  America  (extinct) Mon  xxxv,  pp  80-84 
of  Yellowstone  Park Mon  xxxn,  n,  pp  711-712 
Umatilla  River,  flow  of,  measurements  of Ann  18, 
iv,  pp  361;  Ann  19,  iv,  pp  493-494;  Ann  20,  iv,  pp  63,515; 
Ann  21,  iv,  pp  429-430;  Bull  131,  pp  68-69;  WS  11,  p  88; 
WS  16,  p  180;  WS  28,  pp  167, 169,  170;  WS  38,  pp  376-377 
irrigation  from Bull  131,  pp  69-73 
Umber,  occurrence  and  statistics  of. -MR  1882,  pp  743,  769;  MR  1883-84,  pp  927-928; 
MR  1885,  p  532;  MR  1886,  p  713;  MR  1887,  pp  678,  707,  722, 
803;  MR  1889-90,  pp  619,  620,  622;  MR  1892,  pp  815,  816; 
MR  1893,  pp  758,  759,  760,  761;  Ann  16,  iv,  pp  695,  696,  697; 
Ann  17,  m  cont,  pp  1012, 1013, 1014;  Ann  18,  v  cont,  pp  1337, 
1338,  1339,  1341;  Ann  19,  vi  cont,  pp  635,  637,  638,  640;  Ann 
20,  vi  cont,  pp  721,  724,  726;  Ann  21,  vi  cont,  pp  571-578 
Umpqua  formation  of  Oregon GF  49,  pp  2,  4 
Unakas  in  Chattanooga  district Ann  19,  n,  pp  30,  31 
Uncompahgre  Mountains,  pre-Cambrian  rocks  of Ann  16,  i,  p  824 
Uncompahgre  River,  flow  of,  measurements  of Ann  18,iv,  pp 
265-268;  Ann  19,  iv,  pp  402-404;  Ann  20,  iv,  pp  58,  391-392; 
Ann  21,  iv,  pp  279-480;  Bull  140,  pp  188-189;  WS  11,  p  69; 
WS  16,  p  139;  WS  28,  pp  136,  142,  144;  WS  37,  pp  296-297 
profile  of WS  44,  p  87 
Unconformity  above  and  below  Potomac  formation Mon  xv,  pp  58-59 
as  a  basis  for  classification  of  formations Ann  7,  pp  390-395,  438-445 
distinguishing  characters  of Ann  7,  pp  395-437 
in  California,  Coast  Ranges Mon  xin,  pp  188-195,  295-299 
in  Colorado,  near  Gunnison Ann  6,  pp  64-66 
in  Grand  Canyon  of  Colorado Mon  n,  pp  178-182,  207 
in  Lake  Superior  region Ann  7,  pp  399-414,  417-428,  429-437; 
Ann  10,  i,  pp  453-456;  Ann  15,  pp  633-635,  637-638;  Mon 
xix,  pp  444-463;  Mon  xxviii  passim;  Bull  86,  pp  174-183 
in  Montana,  between  Laramie  and  Livingston  formations Bull  105,  pp  34-35 
in  Nevada,  Silurian  rocks  at  Eureka Ann  3,  p  267 
in  Sierra  Nevada,  between  Mariposa  and  Calaveras Ann  14,  n,  pp  456-458 
of  Keweenaw  series  ,„,..,, Ann  3,  pp  152-156;  Mon  v,  pp  251-259;  Bull  23 
