﻿22 
  EEPORT 
  UNITED 
  STATES 
  GEOLOGICAL 
  SURVEY. 
  

  

  the 
  Mountain 
  of 
  the 
  Holy 
  Cross. 
  In 
  1874, 
  the 
  views 
  covered 
  a 
  much 
  

   greater 
  range 
  of 
  subjects, 
  taking 
  in 
  the 
  Parks, 
  the 
  San 
  Juan 
  Mountains, 
  

   and 
  the 
  remarkable 
  ancient 
  ruins 
  south 
  of 
  the 
  La 
  Plata 
  Mountains. 
  

   These 
  ruins 
  were 
  first 
  brought 
  to 
  the 
  notice 
  of 
  the 
  world 
  through 
  the 
  

   photographs 
  made 
  of 
  them 
  by 
  Mr. 
  Jackson. 
  The 
  interesting 
  results 
  

   secured 
  the 
  previous 
  year 
  justified 
  the 
  sending 
  of 
  Mr. 
  Jackson 
  to 
  the 
  same 
  

   region 
  again 
  in 
  1875, 
  but 
  extending 
  his 
  journey 
  down 
  the 
  hitherto 
  un- 
  

   explored 
  San 
  Juan 
  to 
  the 
  mouth 
  of 
  the 
  Eio 
  de 
  Ohelly, 
  and 
  then 
  to 
  the 
  Mo- 
  

   guls 
  Pueblos 
  in 
  Arizona, 
  many 
  interesting 
  ruins 
  were 
  discovered, 
  which 
  

   were 
  fully 
  described 
  and 
  illustrated 
  in 
  the 
  Bulletin 
  and 
  also 
  the 
  Annual 
  

   Eeport 
  for 
  that 
  year, 
  lieturning 
  from 
  Moqui 
  via 
  the 
  De 
  Chelly, 
  the 
  

   plateau 
  country 
  between 
  the 
  Sierra 
  Abajo 
  and 
  La 
  Plata 
  was 
  found 
  to 
  

   contain 
  many 
  interesting 
  ruins, 
  and 
  was 
  thoroughly 
  photographed. 
  An 
  

   interesting 
  feature 
  in 
  connection 
  with 
  this 
  season's 
  work 
  was 
  the 
  suc- 
  

   cess 
  attending 
  the 
  production 
  of 
  a 
  series 
  of 
  24 
  by 
  20 
  inch 
  negatives 
  of 
  the 
  

   most 
  i^rominent 
  points 
  in 
  the 
  San 
  Juan 
  Mountains, 
  the 
  very 
  first 
  plate 
  

   of 
  this 
  size 
  ever 
  made 
  among 
  the 
  Eocky 
  Mountains. 
  

  

  From 
  the 
  two 
  thousand 
  or 
  more 
  negatives 
  made 
  during 
  these 
  pre- 
  

   ceding 
  six 
  years, 
  we 
  must 
  ascertain 
  what 
  return 
  they 
  have 
  made 
  for 
  the 
  

   time 
  and 
  money 
  expended 
  upon 
  their 
  production, 
  and 
  entirely 
  aside, 
  

   too, 
  from 
  their 
  aesthetic 
  qualities, 
  and 
  the 
  pleasure 
  which 
  lovers 
  of 
  the 
  

   beautiful 
  and 
  picturesque 
  may 
  derive 
  from 
  them. 
  They 
  have 
  done 
  very 
  

   much, 
  in 
  the 
  first 
  place, 
  to 
  secure 
  truthfulness 
  in 
  the 
  representation 
  of 
  

   mountain 
  and 
  other 
  scenery. 
  Twenty 
  years 
  ago, 
  hardly 
  more 
  than 
  

   caricatures 
  existed, 
  as 
  a 
  general 
  rule, 
  of 
  the 
  leading 
  features 
  of 
  overland 
  

   exploration. 
  Mountains 
  were 
  represented 
  with 
  angles 
  of 
  sixty 
  degrees 
  

   inclination, 
  covered 
  with 
  great 
  glaciers, 
  and 
  modeled 
  upon 
  the 
  type 
  of 
  

   any 
  other 
  than 
  the 
  Eocky 
  Mountains; 
  the 
  angular 
  lines 
  of 
  a 
  sandstone 
  

   mesa, 
  represented 
  with 
  all 
  the 
  peculiarities 
  of 
  volcanic 
  upheaval, 
  or 
  of 
  

   massive 
  granite, 
  or 
  an 
  ancient 
  ruin 
  with 
  clean-cut, 
  perfectly 
  squared 
  

   and 
  jointed 
  masonry, 
  that 
  would 
  be 
  creditable 
  to 
  modern 
  times. 
  The 
  

   truthful 
  representations 
  of 
  photography 
  render 
  such 
  careless 
  work 
  so 
  

   apparent 
  that 
  it 
  would 
  not 
  be 
  tolerated 
  at 
  the 
  present 
  day. 
  

  

  One 
  of 
  their 
  most 
  evident 
  practical 
  uses 
  is 
  in 
  securing 
  faithful 
  views 
  

   of 
  the 
  many 
  unique 
  and 
  remarkable 
  features 
  of 
  newly 
  explored 
  territory, 
  

   that 
  are 
  subsequently 
  to 
  be 
  reproduced, 
  by 
  engraving, 
  in 
  the 
  Eeports. 
  

   Especially 
  to 
  be 
  noted 
  in 
  this 
  line 
  are 
  the 
  views 
  of 
  the 
  remarkable 
  hot- 
  

   spring 
  deposits 
  of 
  the 
  Yellowstone 
  National 
  Park, 
  where 
  the 
  exceedingly 
  

   intricate 
  and 
  delicate 
  tracery 
  of 
  the 
  incrustations, 
  that 
  would 
  defy 
  the 
  

   most 
  expert 
  pencil, 
  is 
  readily 
  secured 
  in 
  all 
  its 
  varied 
  forms. 
  So 
  it 
  

   is 
  also 
  with 
  the 
  great 
  caSons, 
  grand 
  waterfalls, 
  impressive 
  mountain 
  

   masses, 
  the 
  craters 
  of 
  old 
  volcanoes, 
  and 
  beds 
  of 
  ancient 
  lakes, 
  the 
  fault- 
  

   ing 
  and 
  folding 
  of 
  the 
  strata, 
  and 
  many 
  other 
  features, 
  of 
  which 
  the 
  

   geologist 
  finds 
  it 
  necessary 
  to 
  have 
  accurate 
  representations 
  for 
  the 
  

   illustration 
  of 
  his 
  subjects. 
  To 
  the 
  topographer, 
  also, 
  it 
  is 
  of 
  great 
  

   assistance 
  in 
  enabling 
  him 
  to 
  represent 
  correctly 
  the 
  surface 
  of 
  the 
  

  

  