﻿REPORT 
  OF 
  F. 
  V. 
  HAYDEN, 
  

  

  UNITED 
  STATES 
  GEOLOGISTmOHAEGE. 
  

  

  LETTER 
  TO 
  THE 
  SECRETARY. 
  

  

  Office 
  U. 
  S. 
  Geological 
  and 
  

   Geographical 
  Survey 
  of 
  the 
  Territories, 
  

  

  Washington, 
  March 
  15, 
  1877. 
  

  

  Sir 
  : 
  I 
  have 
  the 
  honor 
  to 
  present 
  for 
  your 
  approval, 
  and 
  for 
  publica- 
  

   tion, 
  the 
  Ninth 
  Annual 
  Eeport 
  of 
  the 
  United 
  States 
  Geological 
  and 
  Geo- 
  

   graphical 
  Survey 
  of 
  the 
  Territories, 
  embracing 
  the 
  principal 
  results 
  of 
  

   the 
  work, 
  both 
  in 
  the 
  field 
  and 
  in 
  the 
  office, 
  during 
  the 
  year 
  1875, 
  when 
  

   the 
  Survey 
  continued 
  the 
  work 
  of 
  the 
  two 
  previous 
  seasons 
  in 
  Colorado, 
  

   completing 
  the 
  southern 
  and 
  southwestern 
  portions 
  of 
  that 
  Territory, 
  

   and 
  including 
  a 
  belt, 
  fifteen 
  miles 
  in 
  width 
  of 
  Northern 
  New 
  Mexico 
  

   and 
  Eastern 
  Utah. 
  

  

  The 
  entire 
  force 
  of 
  the 
  Survey 
  was 
  divided 
  into 
  seven 
  parties 
  for 
  

   special 
  duty, 
  four 
  of 
  which 
  were 
  assigned 
  to 
  specific 
  areas 
  for 
  the 
  per- 
  

   formance 
  of 
  topographical 
  and 
  geological 
  work. 
  The 
  fifth 
  party 
  at- 
  

   tende(i 
  to 
  the 
  primary 
  triangulation, 
  the 
  sixth 
  collected 
  photographic 
  

   views 
  of 
  the 
  most 
  interesting 
  scenery 
  and 
  ancient 
  ruins, 
  while 
  the 
  sev- 
  

   enth 
  transported 
  the 
  supplies 
  to 
  the 
  various 
  districts. 
  

  

  The 
  areas 
  for 
  exploration 
  the 
  present 
  season 
  were 
  much 
  farther 
  from 
  

   the 
  base 
  of 
  supplies 
  than 
  heretofore, 
  rendering 
  the 
  labor 
  greater, 
  and 
  

   causing 
  great 
  loss 
  of 
  time 
  in 
  traveling 
  to 
  and 
  from 
  these 
  bases. 
  Yet 
  the 
  

   amount 
  of 
  topographical 
  and 
  geological 
  work 
  accomplished 
  has 
  not 
  been* 
  

   exceeded 
  by 
  that 
  of 
  any 
  previous 
  year. 
  

  

  As 
  heretofore, 
  the 
  starting 
  point 
  was 
  at 
  Denver. 
  The 
  first 
  or 
  south- 
  

   ern 
  division 
  operated 
  in 
  Southeastern 
  Colorado. 
  It 
  was 
  composed 
  of 
  

   A. 
  D. 
  Wilson, 
  chief 
  topographer, 
  directing; 
  Franklin 
  Rhoda, 
  assistant 
  

   topographer; 
  Dr. 
  F. 
  M. 
  Endlich, 
  geologist; 
  with 
  two 
  packers 
  and 
  a 
  

   cook. 
  The 
  district 
  surve.. 
  ed 
  by 
  this 
  party 
  embraced 
  an 
  area 
  of 
  12,000 
  

   square 
  miles. 
  Within 
  these 
  limits, 
  Mr. 
  Wilson 
  made 
  143 
  stations 
  on 
  the 
  

   more 
  commanding 
  peaks. 
  

  

  A 
  system 
  of 
  triangles 
  was 
  extended 
  over 
  the 
  whole 
  area, 
  while 
  at 
  the 
  

   same 
  time 
  the 
  topographical 
  sketches 
  and 
  angles 
  were 
  taken, 
  baromet- 
  

   rical 
  readings 
  were 
  made 
  at 
  all 
  occupied 
  points, 
  at 
  all 
  camps, 
  passes, 
  

   and 
  other 
  places 
  of 
  note 
  visited 
  during 
  the 
  season^ 
  Many 
  of 
  the 
  sta- 
  

   1 
  G 
  s 
  

  

  