﻿38 
  REPORT 
  UNITED 
  STATES 
  GEOLOGICAL 
  SURVEY. 
  

  

  unite 
  aud 
  flow 
  into 
  a 
  turbid 
  triangular 
  pool, 
  which 
  is 
  about 
  fifteen 
  feet 
  

   from 
  them. 
  They 
  are 
  situated 
  on 
  a 
  mound, 
  which 
  is 
  about 
  50 
  feet 
  above 
  

   the 
  general 
  level 
  of 
  the 
  valley. 
  This 
  mound 
  is 
  composed 
  of 
  a 
  calcareous 
  

   deposit, 
  slightly 
  rust-colored 
  from 
  the 
  oxidation 
  of 
  iron, 
  which, 
  how- 
  

   ever, 
  does 
  not 
  ajjpear 
  to 
  be 
  very 
  abundant. 
  

  

  Spring 
  jSTo. 
  1 
  is 
  about 
  4 
  feet 
  ib 
  diameter 
  aud 
  2 
  feet 
  deep. 
  There 
  is 
  

   considerable 
  evolution 
  of 
  carbonic-acid 
  gas, 
  which 
  gives 
  the 
  water 
  a 
  

   rather 
  agreeable 
  taste. 
  It 
  has 
  also 
  a 
  slight 
  taste 
  of 
  iron. 
  

  

  Spring 
  No. 
  2 
  is 
  6 
  inches 
  in 
  diameter. 
  It 
  probably 
  has 
  the 
  same 
  ori- 
  

   gin 
  as 
  No. 
  1, 
  with 
  which 
  also 
  its 
  waters 
  join. 
  

  

  Spring 
  No. 
  3 
  (pool) 
  is 
  12 
  or 
  15 
  feet 
  from 
  the 
  two 
  springs, 
  with 
  which 
  

   it 
  is 
  connected 
  by 
  a 
  ditch-like 
  channel, 
  iron-stained 
  and 
  tilled 
  with 
  con- 
  

   fervoideie. 
  It 
  is 
  triangular 
  in 
  shape 
  and 
  ab 
  ut 
  20 
  feet 
  across 
  at 
  its 
  widest 
  

   part. 
  Its 
  water 
  is 
  turbid, 
  due 
  perhaps 
  to 
  the 
  presence 
  of 
  sulphur. 
  

  

  The 
  following 
  temperatures 
  were 
  taken 
  about 
  10 
  a. 
  m., 
  the 
  tempera- 
  

   ture 
  of 
  the 
  air 
  being 
  QQ'^ 
  F. 
  : 
  spring 
  No. 
  1, 
  temperature 
  84° 
  F. 
  ; 
  spring 
  

   No. 
  2, 
  temperature 
  84° 
  F.; 
  spring 
  No. 
  3, 
  (pool,) 
  temperature 
  80° 
  F. 
  Ex- 
  

   tending 
  for 
  some 
  distance 
  above 
  the 
  springs, 
  old 
  spring 
  deposits 
  can 
  

   be 
  seen 
  in 
  the 
  valley, 
  showing 
  that 
  once 
  the 
  springs 
  were 
  probably 
  

   much 
  more 
  extensive. 
  

  

  Groui) 
  No. 
  2. 
  — 
  The 
  springs 
  of 
  this 
  group 
  are 
  nearly 
  all 
  cold. 
  There 
  

   are 
  a 
  number 
  of 
  pools 
  from 
  which 
  no 
  water 
  escapes, 
  and 
  which 
  do 
  not 
  

   deserve 
  the 
  name 
  of 
  springs. 
  Around 
  them 
  the 
  mound 
  on 
  which 
  they, 
  

   are 
  situated 
  is 
  turfed 
  over, 
  while 
  nearer 
  the 
  creek 
  the 
  calcareous 
  deposit 
  

   is 
  distinctly 
  seen. 
  There 
  are 
  but 
  two 
  springs 
  here 
  deserving 
  of 
  notice. 
  

  

  No. 
  1 
  is 
  about 
  5 
  feet 
  in 
  diameter, 
  and 
  tastes 
  and 
  smells 
  strongly 
  of 
  

   sulphur. 
  Its 
  temperature 
  was 
  71"^ 
  F., 
  that 
  of 
  the 
  air 
  being 
  QQ^, 
  about 
  

   a 
  quarter 
  after 
  ten 
  oclock 
  a. 
  m. 
  

  

  No. 
  2 
  is 
  the 
  best 
  spring 
  of 
  the 
  group. 
  It 
  bubbles 
  up 
  quite 
  close 
  to 
  

   the 
  road, 
  and 
  is 
  distinguished 
  by 
  the 
  abundant 
  deposit 
  of 
  iron 
  oxide 
  

   lining 
  its 
  basin. 
  The 
  evolution 
  of 
  carbonic-acid 
  gas 
  is 
  abundant, 
  and 
  

   the 
  taste 
  of 
  the 
  water 
  is 
  exceedingly 
  agreeable. 
  Its 
  temperature 
  was 
  

   48° 
  F. 
  ; 
  air, 
  60° 
  F. 
  All 
  the 
  temperatures 
  given 
  above 
  were 
  taken 
  Julv 
  

   4, 
  1875. 
  

  

  ' 
  The 
  branches 
  of 
  White 
  Earth 
  Eiver 
  are 
  unimportant. 
  The 
  largest, 
  

   just 
  west 
  of 
  station 
  1, 
  flows 
  near 
  the 
  line 
  separating 
  the 
  trachyte 
  trom 
  

   1 
  he 
  gneissic 
  rock. 
  Station 
  No 
  1 
  is 
  gneissic 
  and 
  seems 
  to 
  have 
  been 
  an 
  

   island 
  in 
  the 
  lava-sea, 
  while 
  the 
  first 
  flows 
  were 
  taking 
  place. 
  It 
  was, 
  

   however, 
  probably 
  covered 
  by 
  some 
  of 
  the 
  later 
  flows, 
  for 
  station 
  No. 
  2 
  

   has 
  very 
  nearly 
  the 
  same 
  level, 
  and 
  is 
  basalt-capped, 
  the 
  volcanic 
  layers 
  

   (trachyte 
  and 
  breccia) 
  exitending 
  1,500 
  feet 
  beneath 
  it. 
  The 
  trachyte 
  

   . 
  beneath 
  the 
  capping 
  of 
  station 
  No. 
  2 
  is 
  by 
  no 
  means 
  the 
  upper 
  layer, 
  as 
  

   we 
  find 
  on 
  going 
  southward. 
  This 
  subject 
  will 
  be 
  referred 
  to 
  again 
  

   when 
  I 
  come 
  to 
  the 
  consideration 
  of 
  the 
  volcanic 
  rocks 
  of 
  the 
  district. 
  

  

  LAKE 
  FORK. 
  

  

  Lake 
  Fork 
  is 
  one 
  of 
  the 
  largest 
  southern 
  tributaries 
  of 
  the 
  Gunnison 
  

   Eiver. 
  It 
  rises 
  in 
  the 
  region 
  adjacent 
  to 
  Handle's 
  Peak, 
  in 
  the 
  San 
  Juan 
  

   Mountains. 
  It 
  flows 
  toward 
  the 
  east, 
  but 
  soon 
  changes 
  its 
  course 
  to 
  the 
  

   northeast, 
  and 
  again, 
  to 
  a 
  few 
  degrees 
  west 
  of 
  north. 
  We 
  crossed 
  it 
  at 
  

   the 
  mouth 
  of 
  Indian 
  Creek, 
  a 
  small 
  tributary 
  from 
  the 
  east, 
  about 
  14 
  

   miles 
  above 
  its 
  mouth. 
  It 
  is 
  here 
  in 
  caiion-valley. 
  The 
  caiion 
  walls 
  

   are 
  between 
  700 
  and 
  800 
  feet 
  high 
  to 
  the 
  first 
  distinct 
  terrace. 
  At 
  

   about 
  300 
  feet 
  above 
  the 
  level 
  of 
  the 
  valley 
  there 
  is 
  an 
  indistinct 
  

   terrace. 
  This 
  seems 
  to 
  mark 
  the 
  summit 
  of 
  the 
  breccia. 
  Some 
  distance 
  

  

  