﻿100 
  EEPORT 
  UNITED 
  STATES 
  GEOLOGICAL 
  SURVEY. 
  

  

  It 
  will 
  not 
  coTie. 
  

  

  In 
  the 
  divide 
  between 
  the 
  Uncompahgre 
  Eiver 
  and 
  Cebolla 
  Creek 
  

   coal 
  is 
  found 
  in 
  Upper 
  Cretaceous 
  strata. 
  The 
  Indian 
  trail 
  passes 
  

   directly 
  over 
  the 
  outcrop. 
  

  

  The 
  coal 
  is 
  soft, 
  breaks 
  down 
  readily 
  on 
  exposure 
  to 
  the 
  atmosphere, 
  

   and 
  has 
  a 
  dull 
  luster. 
  The 
  following 
  is 
  the 
  analysis 
  by 
  Dr. 
  Endlich 
  : 
  

  

  Per 
  cent. 
  

  

  Water 
  1 
  7.26 
  

  

  Fixed 
  carbon 
  41.72 
  

  

  Ash 
  , 
  7.60 
  

  

  Volatile 
  matters 
  bj' 
  difference 
  43.4*2 
  

  

  100.00 
  

   Specific 
  gravity 
  1.45. 
  

  

  This 
  coal 
  may 
  be 
  characterized 
  as 
  a 
  free-burning, 
  non-coking, 
  bitumi- 
  

   nous 
  coal. 
  

  

  No 
  mining 
  has 
  been 
  attempted 
  at 
  either 
  locality. 
  The 
  blacksmith 
  at 
  

   the 
  Uncompahgre 
  agency 
  has 
  tried 
  both 
  coals, 
  but 
  with 
  little 
  success. 
  

  

  SALT. 
  

  

  As 
  noted 
  in 
  previous 
  portions 
  of 
  the 
  report, 
  salt 
  is 
  found 
  in 
  Sinbad's 
  

   Valley, 
  at 
  the 
  head 
  of 
  Salt 
  Creek, 
  a 
  branch 
  of 
  the 
  Dolores. 
  It 
  a]>pears 
  

   to 
  impregnate 
  the 
  sandstones 
  of 
  the 
  Upper 
  Carboniferous 
  and 
  Lower 
  

   Trias, 
  and 
  the 
  water 
  of 
  Salt 
  Creek 
  is 
  strongly 
  saline. 
  

  

  CATALOaUE 
  OF 
  MINERALS. 
  

  

  The 
  catalogue 
  of 
  minerals 
  is 
  naturally 
  small 
  ; 
  there 
  is 
  no 
  catalogue 
  

   of 
  rocks, 
  all 
  specimens 
  having 
  been 
  lost 
  at 
  the 
  Dolores 
  supjjly 
  camp. 
  

  

  Agate. 
  In 
  tbe 
  valley 
  of 
  the 
  Gunnison 
  River 
  and 
  southward 
  between 
  White 
  Earth 
  Creek 
  

  

  and 
  the 
  LTneompahgre 
  River. 
  

   Amphibole 
  hornblende 
  in 
  the 
  volcanic 
  rocks 
  included 
  in 
  the 
  breccia 
  along 
  the 
  Gunnison 
  

  

  River. 
  In 
  acicular 
  crystals 
  in 
  the 
  porphyritic 
  trachyte 
  of 
  the 
  Sierra 
  la 
  Sal 
  and 
  Lone 
  

  

  Cone. 
  

   Calcite. 
  In 
  the 
  cretaceous 
  rocks 
  of 
  the 
  Uncompahgre 
  Valley, 
  in 
  red 
  sandstones 
  near 
  Una- 
  

   weep 
  Canon. 
  

   Chalcedony. 
  South 
  side 
  of 
  Gunnison 
  River 
  in 
  trachyte. 
  

   Coal.: 
  

  

  Lignite 
  in 
  the 
  Dakota 
  sandstones 
  west 
  of 
  the 
  Uncompagre 
  River 
  and 
  in 
  the 
  canon 
  of 
  the 
  

  

  San 
  Miguel 
  River. 
  

   Bituminous 
  coal 
  (Lifrnite) 
  in 
  the 
  Upper 
  Cretaceous 
  sandstones 
  in 
  the 
  divide 
  between 
  the 
  

  

  Uncompahgre 
  River 
  and 
  Cebolla 
  Creek. 
  

   Semi-anthracite 
  in 
  the 
  canon 
  of 
  Uncompahgre 
  River 
  below 
  Unccmpahgre 
  Park. 
  

   Feldspar: 
  

  

  Orthoclase 
  and 
  undetermined 
  varieties 
  along 
  the 
  Gunnison 
  River 
  above 
  the 
  Grand 
  Canon, 
  

  

  in 
  Unaweep 
  Canon, 
  and 
  in 
  granitic 
  outcrops 
  on 
  the 
  Uncompahgre 
  Plateau. 
  

   Undetermined 
  variety 
  in 
  porphyritic 
  trachyte 
  of 
  the 
  Sierra 
  la 
  Sal 
  and 
  Lone 
  Cone. 
  

   Snnidine. 
  In 
  rhyolite 
  and 
  obsidian 
  on 
  south 
  side 
  of 
  Gunnison 
  River 
  between 
  White 
  

  

  Earth 
  and 
  Cebolla 
  Creeks. 
  

   Galenite. 
  In 
  mineral 
  veins 
  at 
  the 
  head 
  of 
  Lake 
  Fork 
  of 
  Gunnison 
  River 
  and 
  near 
  Ouray, 
  

  

  at 
  the 
  head 
  of 
  the 
  Uncompahgre 
  River. 
  

   Gold. 
  In 
  placer 
  bars 
  on 
  the 
  San 
  Miguel 
  River. 
  

   Gypsum. 
  In 
  Upper 
  Carboni.'erous 
  rocks 
  of 
  the 
  Dolores 
  River 
  and 
  Salt 
  Creek. 
  In 
  the 
  Crct.i.- 
  

  

  ceous 
  shales 
  of 
  the 
  Uncompagre 
  River. 
  In 
  neither 
  locality 
  does 
  it 
  occur 
  in 
  large 
  quiia- 
  

  

  tity. 
  Selenite 
  is 
  abundant 
  in 
  many 
  places. 
  

   Halite 
  {salt). 
  Associated 
  with 
  gypsum 
  and 
  sulphur 
  in 
  sandstones 
  of 
  Upper 
  Carbonifer- 
  

   ous 
  or 
  Lower 
  Trias 
  iu 
  Sinbad's 
  Valley 
  near 
  the 
  head 
  of 
  Salt 
  Creek, 
  a 
  tributary 
  of 
  the 
  

  

  Dolores 
  River, 
  near 
  the 
  Sierra 
  la 
  Sal. 
  

   Hematite 
  (micaceous). 
  In 
  Unaweep 
  Calion. 
  

   Hornblende. 
  (See 
  Amphibole.) 
  

  

  