﻿380 
  A. 
  M. 
  Edwards 
  — 
  Infusorial 
  Earths 
  of 
  Pacific 
  Coast. 
  

  

  help 
  to 
  prove 
  interesting 
  upon 
  this 
  point. 
  Both 
  of 
  these 
  

   classes 
  of 
  deposits 
  have 
  been 
  called 
  ' 
  fossil,' 
  but 
  if 
  either 
  of 
  

   them 
  can 
  be 
  properly 
  so 
  designated 
  it 
  must 
  be 
  the 
  sub-Plutonic 
  

   one 
  alone 
  ; 
  the 
  others 
  are 
  of 
  recent 
  origin 
  and 
  identical 
  

   deposits 
  are 
  now 
  undergoing 
  formation 
  all 
  over 
  the 
  world. 
  

   Thus, 
  all 
  through 
  the 
  New 
  England 
  States 
  they 
  are 
  very 
  com- 
  

   mon. 
  At 
  Bemus 
  Lake, 
  in 
  New 
  Hampshire, 
  the 
  bed 
  of 
  that 
  

   piece 
  of 
  water 
  when 
  stirred 
  up 
  by 
  means 
  of 
  a 
  pole 
  is 
  seen 
  to 
  

   be 
  almost 
  white 
  in 
  color 
  and 
  consist 
  entirely 
  of 
  the 
  dead 
  shells 
  

   of 
  Diatomaceee. 
  As 
  Bailey's 
  conclusions, 
  although 
  they 
  had 
  

   been 
  founded 
  upon 
  extremely 
  slight 
  foundations, 
  had 
  been 
  

   accepted 
  by 
  geologists 
  generally 
  it 
  came 
  to 
  be 
  asserted 
  that 
  no 
  

   fresh 
  water 
  deposits 
  of 
  Diatomacere 
  were 
  to 
  be 
  found 
  upon 
  

   the 
  coast 
  side 
  of 
  the 
  Sierra 
  Nevada, 
  only 
  marine 
  strata 
  being 
  

   there 
  seen 
  and 
  not 
  extending 
  to 
  the 
  western 
  slope 
  of 
  the 
  

   mountains. 
  Hence, 
  it 
  became 
  of 
  interest 
  to 
  determine 
  whether 
  

   the 
  deposits 
  discovered 
  since 
  Bailey's 
  time 
  in 
  that 
  part 
  of 
  the 
  

   country 
  bore 
  out 
  his 
  theory 
  or 
  not, 
  and 
  this 
  was 
  one 
  of 
  the 
  

   questions 
  put 
  to 
  me 
  when 
  these 
  specimens 
  were 
  placed 
  in 
  my 
  

   hands. 
  

  

  As 
  will 
  be 
  seen, 
  all 
  of 
  the 
  seven 
  deposits 
  which 
  I 
  found 
  to 
  

   contain 
  the 
  remains 
  of 
  Diatomacese, 
  in 
  the 
  above 
  mentioned 
  

   collection, 
  are 
  of 
  fresh 
  water 
  origin, 
  three 
  of 
  them 
  being 
  

   decidedly 
  of 
  recent 
  formation, 
  or 
  lacustrine 
  sedimentary, 
  and 
  

   the 
  other 
  four 
  from 
  the 
  beds 
  of 
  extinct 
  lakes, 
  or 
  sub-Plutonic. 
  

   It 
  will 
  also 
  be 
  noted 
  that 
  all 
  of 
  them 
  with 
  the 
  exception 
  of 
  

   one, 
  that 
  from 
  Winass 
  River, 
  are 
  from 
  the 
  western 
  side 
  of 
  the 
  

   mountains, 
  that 
  one 
  being 
  from 
  the 
  east. 
  However, 
  from 
  

   what 
  I 
  have 
  already 
  said 
  respecting 
  the 
  mode 
  of 
  formation 
  of 
  

   these 
  fresh 
  water 
  strata 
  containing 
  Diatoms 
  it 
  will 
  be 
  under- 
  

   stood 
  that 
  but 
  little 
  of 
  geological 
  value 
  attaches 
  to 
  the 
  examina- 
  

   tion 
  of 
  such 
  strata 
  by 
  means 
  of 
  the 
  microscope 
  unless 
  they 
  are 
  

   proved 
  by 
  other 
  evidence 
  to 
  be 
  of 
  greater 
  age 
  than 
  the 
  present 
  

   period. 
  So 
  that 
  my 
  examination 
  even 
  taken 
  for 
  what 
  the 
  

   results 
  obtained 
  are 
  worth 
  does 
  not 
  bear 
  out 
  Bailey's 
  theory. 
  

  

  The 
  second 
  parcel 
  of 
  earths 
  which 
  I 
  received 
  for 
  examina- 
  

   tion 
  were 
  for 
  the 
  most 
  part 
  collected 
  by 
  Dr. 
  J. 
  S. 
  Newberry 
  

   during 
  prosecution 
  of 
  the 
  survey 
  of 
  the 
  Colorado 
  River 
  by 
  

   the 
  expedition 
  under 
  the 
  command 
  of 
  Col. 
  Ives, 
  and 
  also 
  

   while 
  connected 
  with 
  the 
  Pacific 
  Railroad 
  Survey 
  under 
  Lieut. 
  

   Williamson. 
  They 
  were 
  as 
  below 
  : 
  

  

  1. 
  26. 
  Shores 
  of 
  Lower 
  Klamath 
  Lake, 
  borders 
  of 
  Oregon 
  

   and 
  California. 
  

  

  * 
  2. 
  23. 
  Monterey, 
  Cal. 
  

  

  * 
  3. 
  1. 
  San 
  Francisco, 
  Cal. 
  

  

  * 
  4. 
  San 
  Diego, 
  Cal. 
  

  

  * 
  5. 
  55. 
  Pit 
  River 
  Valley, 
  Cal. 
  

  

  