﻿250 
  Lahee 
  — 
  New 
  Fossiliferous 
  Horizon, 
  in 
  Littleton, 
  N 
  . 
  H. 
  

  

  In 
  this 
  fossiliferous 
  horizon, 
  then, 
  we 
  have 
  evidence 
  of 
  

   marine 
  deposition 
  during 
  early 
  Devonian 
  times. 
  Unless 
  the 
  

   Fitch 
  Hill 
  arkose 
  and 
  the 
  conglomerate 
  of 
  Locs. 
  19 
  and 
  20 
  

   represent 
  a 
  short 
  cessation 
  in 
  deposition, 
  sediments 
  were 
  being 
  

   laid 
  down 
  continuously 
  from 
  Niagaran 
  times 
  up 
  into 
  the 
  early 
  

   Devonian, 
  and 
  this 
  may 
  have 
  continued 
  much 
  longer. 
  With 
  

   the 
  possible 
  exception 
  of 
  a 
  few 
  hundred 
  feet, 
  post-Carbon- 
  

   iferous 
  erosion 
  has 
  removed 
  all 
  rocks 
  higher 
  than 
  the 
  Blueberry 
  

   Mt. 
  Devonian. 
  

  

  In 
  the 
  present 
  connection 
  we 
  may 
  quote 
  the 
  following 
  

   remark 
  of 
  Professor 
  Hitchcock 
  : 
  " 
  The 
  fossils 
  characterize 
  only 
  

   the 
  basal 
  limestones,* 
  which 
  are 
  middle 
  Upper 
  Silurian. 
  There 
  

   is 
  certainly 
  enough 
  thickness 
  of 
  strata 
  in 
  the 
  sandstone, 
  slates, 
  

   and 
  conglomerate 
  superposed, 
  on 
  the 
  limestones 
  to 
  suggest 
  at 
  

   least 
  the 
  residue 
  of 
  the 
  Upper 
  Silurian, 
  and 
  perhaps 
  the 
  

   Devonian."! 
  

  

  At 
  Bernardston, 
  Mass., 
  in 
  the 
  Connecticut 
  valley 
  about 
  150 
  

   miles 
  south 
  of 
  Littleton, 
  is 
  a 
  section 
  showing 
  limestone 
  over- 
  

   lain 
  by 
  quartzite. 
  Fossils 
  in 
  these 
  rocks 
  prove 
  them 
  to 
  be 
  of 
  

   Devonian 
  age, 
  the 
  limestone 
  Helderbergian 
  and 
  the 
  quartzite 
  

   Oriskanian.J 
  Emerson 
  assigns 
  both 
  limestone 
  and 
  quartzite 
  to 
  

   the 
  Upper 
  Devonian. 
  § 
  

  

  The 
  Littleton 
  Devonian 
  may 
  be 
  taken 
  as 
  additional 
  evidence 
  

   confirmatory 
  of 
  the 
  Connecticut 
  valley 
  trough 
  in 
  which 
  the 
  

   marine 
  Devonian 
  strata 
  of 
  Bernardston 
  have 
  long 
  been 
  thought 
  

   to 
  have 
  been 
  deposited. 
  

  

  Institute 
  of 
  Technology, 
  Boston. 
  

  

  • 
  * 
  On 
  Fitch 
  Hill. 
  

  

  f 
  New 
  Studies 
  in 
  the 
  Ammonoosuc 
  District, 
  p. 
  465. 
  

  

  % 
  Clarke, 
  J. 
  M. 
  : 
  Early 
  Devonian 
  History 
  of 
  New 
  York 
  and 
  Eastern 
  North 
  

   America. 
  N. 
  Y. 
  State 
  Museum, 
  Memoir 
  9, 
  vol. 
  1, 
  p. 
  156, 
  1908-1909. 
  

  

  § 
  Emerson, 
  B. 
  K. 
  : 
  Geology 
  of 
  Old 
  Hampshire 
  County, 
  Mass., 
  IT. 
  S. 
  G. 
  S., 
  

   Monog. 
  xxix, 
  p. 
  258, 
  1898. 
  

  

  