﻿414 
  J. 
  Barrell 
  — 
  The 
  Piedmont 
  Terraces 
  

  

  race 
  is 
  examined 
  carefully 
  it 
  is 
  seen 
  that 
  the 
  hilltops 
  

   most 
  probably 
  fall 
  into 
  a 
  series 
  of 
  benches 
  separated 
  by 
  

   intervals 
  of 
  100-200 
  feet, 
  as 
  shown 
  by 
  the 
  dashed 
  lines. 
  

   The 
  Goshen, 
  Litchfield, 
  and 
  Prospect 
  terraces 
  are 
  most 
  

   clearly 
  marked, 
  whereas 
  the 
  Towantic 
  and 
  lower 
  terraces 
  

   are 
  less 
  plainly 
  defined 
  on 
  the 
  sky-line 
  but 
  have 
  a 
  well 
  

   marked 
  re-entrant 
  character. 
  The 
  evidence 
  in 
  favor 
  of 
  

   the 
  three 
  upper 
  terraces 
  — 
  the 
  Becket, 
  Canaan 
  and 
  Corn- 
  

   wall 
  — 
  is 
  less 
  decisive 
  and 
  will 
  be 
  touched 
  on 
  later 
  ; 
  it 
  was 
  

   the 
  character 
  of 
  the 
  topography 
  in 
  the 
  region 
  south 
  of 
  

   the 
  Cornwall 
  terrace 
  especially 
  that 
  led 
  Professor 
  Bar- 
  

   rell 
  to 
  consider 
  a 
  marine 
  origin 
  for 
  the 
  terraces. 
  

  

  By 
  reference 
  to 
  the 
  preceding 
  table 
  it 
  will 
  be 
  seen 
  that 
  

   there 
  is 
  no 
  likelihood 
  of 
  any 
  definite 
  evidence 
  of 
  marine 
  

   planation 
  being 
  found 
  in 
  the 
  region 
  covered 
  by 
  the 
  two 
  

   oldest 
  terraces 
  — 
  the 
  Becket 
  and 
  Canaan 
  — 
  nor, 
  presum- 
  

   ably, 
  in 
  that 
  covered 
  by 
  the 
  Cornwall 
  terrace, 
  for 
  this 
  

   region 
  has 
  been 
  exposed 
  for 
  too 
  long 
  a 
  time 
  to 
  subaerial 
  

   erosion. 
  Professor 
  Barrell 
  stated 
  in 
  reply 
  to 
  a 
  question 
  

   raised 
  by 
  Professor 
  D. 
  W. 
  Johnson 
  that 
  "The 
  two 
  

   higher 
  terraces 
  are 
  less 
  well 
  preserved, 
  and 
  conclusions 
  

   in 
  regard 
  to 
  them 
  rest 
  therefore 
  not 
  so 
  much 
  on 
  their 
  

   internal 
  evidence 
  as 
  from 
  the 
  broader 
  relations 
  of 
  these 
  

   terraces, 
  on 
  the 
  one 
  hand, 
  to 
  the 
  well-preserved 
  ones 
  at 
  

   a 
  lower 
  elevation 
  on 
  the 
  seaward 
  side, 
  and, 
  on 
  the 
  other 
  

   hand, 
  to 
  the 
  different 
  character 
  of 
  the 
  topography 
  on 
  

   the 
  side 
  of 
  the 
  mountains, 
  especially 
  the 
  sharpness 
  of 
  

   that 
  line 
  diagonal 
  to 
  the 
  structure 
  which 
  separates 
  the 
  

   highest 
  terrace 
  from 
  the 
  still 
  higher 
  and 
  mountainous 
  

   uplands.'' 
  The 
  topographic 
  break 
  referred 
  to 
  is 
  shown 
  

   on 
  the 
  profile 
  where 
  the 
  inner 
  margin 
  of 
  the 
  Becket 
  ter- 
  

   race 
  cuts 
  across 
  the 
  southern 
  slope 
  of 
  the 
  Mount 
  Gray- 
  

   lock 
  massif. 
  This 
  feature 
  of 
  the 
  topography 
  was 
  traced 
  

   from 
  the 
  above 
  locality 
  first 
  northeastward 
  for 
  about 
  

   fourteen 
  miles 
  and 
  then 
  in 
  a 
  more 
  northerly 
  direction 
  

   along 
  the 
  eastern 
  flank 
  of 
  the 
  Green 
  Mountains 
  well 
  into 
  

   Vermont. 
  It 
  was 
  shown 
  to 
  persist 
  with 
  little 
  regard 
  to 
  

   structure 
  and 
  variation 
  in 
  rock 
  formations 
  and 
  was 
  con- 
  

   sidered 
  as 
  approximately 
  fixing 
  the 
  position 
  of 
  the 
  Cre- 
  

   taceous 
  shore-line. 
  

  

  In 
  the 
  region 
  covered 
  by 
  the 
  Becket 
  and 
  Canaan 
  and 
  

   probably 
  the 
  Cornwall 
  terraces, 
  then, 
  only 
  evidence 
  of 
  

   subaerial 
  erosion 
  is 
  to 
  be 
  expected. 
  In 
  the 
  region 
  cov- 
  

   ered 
  by 
  the 
  younger 
  terraces, 
  on 
  the 
  other 
  hand, 
  although 
  

  

  