﻿REPORT 
  OF 
  A. 
  C. 
  PEALE, 
  M. 
  D., 
  GEOLOGIST 
  OF 
  THE 
  GRAND 
  

   RIVER 
  DIVISION, 
  1875. 
  

  

  LETTER 
  TO 
  DB. 
  F. 
  V. 
  HAYDEN. 
  

  

  Washington, 
  D. 
  C, 
  July 
  1, 
  187G, 
  

  

  Sir: 
  I 
  have 
  the 
  honor 
  herewith 
  to 
  hand 
  you 
  my 
  report 
  as 
  geologist 
  

   of 
  the 
  Grand 
  River 
  division 
  for 
  the 
  season 
  of 
  1875. 
  As 
  usual 
  I 
  refer 
  to 
  

   the 
  report 
  of 
  Mr. 
  Henry 
  Gannett 
  for 
  topographical 
  details, 
  elevations, 
  

   &c. 
  We 
  did 
  not 
  commence 
  work 
  until 
  the 
  4th 
  of 
  July, 
  and 
  were 
  stopped 
  

   by 
  trouble 
  with 
  the 
  Indians 
  on 
  the 
  loth 
  of 
  August. 
  We 
  had 
  therefore 
  

   barely 
  six 
  weeks 
  in 
  which 
  we 
  were 
  able 
  to 
  do 
  any 
  work. 
  This 
  will 
  ac- 
  

   count 
  for 
  the 
  brevity 
  and 
  somewhat 
  incomplete 
  state 
  of 
  the 
  accompany- 
  

   ing 
  report. 
  All 
  specimens 
  had 
  to 
  be 
  abandoned. 
  

  

  My 
  plan 
  of 
  working 
  in 
  the 
  field 
  was 
  substantially 
  the 
  same 
  as 
  that 
  

   followed 
  in 
  1873 
  and 
  1874. 
  

  

  I 
  have 
  followed 
  also 
  my 
  usual 
  plan 
  in 
  the 
  report, 
  considering 
  first 
  the 
  

   general 
  features 
  of 
  the 
  district, 
  and 
  taking 
  up 
  afterwards 
  the 
  special 
  and 
  

   detailed 
  geological 
  facts 
  of 
  each 
  formation 
  represented. 
  I 
  have 
  also 
  

   colored 
  a 
  provisional 
  geological 
  map. 
  

  

  Necessary 
  absence 
  during 
  publication 
  and 
  rapidity 
  of 
  preparation 
  must 
  

   be 
  my 
  excuse 
  for 
  any 
  errors 
  that 
  may 
  appear 
  in 
  this 
  report. 
  

  

  In 
  conclusion, 
  let 
  me 
  express 
  my 
  thanks 
  to 
  all 
  the 
  members 
  of 
  the 
  party 
  

   for 
  their 
  hearty 
  cooperation. 
  

  

  With 
  great 
  respect, 
  I 
  remain, 
  vour 
  obedient 
  servant, 
  

  

  A. 
  C. 
  PEALE 
  

  

  Dr. 
  F. 
  Y. 
  Hayden, 
  

  

  United 
  States 
  Geologist-in-cliarge. 
  

  

  31 
  

  

  