﻿of 
  the 
  Northern 
  Appalachians. 
  415 
  

  

  the 
  topography 
  is 
  mainly 
  the 
  result 
  of 
  fluvial 
  erosion, 
  

   some 
  evidence 
  of 
  marine 
  action 
  should 
  be 
  expected 
  in 
  the 
  

   form 
  of 
  beveled 
  interfluvial 
  ridges 
  and 
  remnants 
  of 
  sea 
  

   cliffs. 
  It 
  seems 
  doubtful 
  if 
  the 
  presence 
  of 
  marine 
  sedi- 
  

   ments 
  should 
  be 
  expected, 
  for 
  the 
  region, 
  in 
  addition 
  to 
  

   fluvial 
  erosion, 
  has 
  been 
  subjected 
  to 
  strong 
  and 
  pro- 
  

   longed 
  glacial 
  erosion 
  and 
  in 
  any 
  case 
  the 
  till 
  cover 
  

   greatly 
  decreases 
  the 
  chances 
  of 
  finding 
  any 
  pockets 
  of 
  

   sediment 
  that 
  might 
  remain. 
  

  

  • 
  It 
  is 
  not 
  necessary 
  to 
  discriminate 
  between 
  glacial 
  and 
  

   marine 
  planation, 
  unless 
  in 
  very 
  detailed 
  study, 
  as 
  the 
  

   effects 
  of 
  the 
  former 
  are 
  strictly 
  subordinate. 
  The 
  till 
  

   cover, 
  however, 
  quite 
  effectively 
  masks 
  the 
  actual 
  con- 
  

   figuration 
  of 
  the 
  bed-rock 
  surface, 
  with 
  which 
  the 
  study 
  

   is 
  primarily 
  concerned, 
  and 
  should 
  be 
  allowed 
  for. 
  Pro- 
  

   fessor 
  Barrell 
  was 
  allowing 
  for 
  the 
  effects 
  of 
  glaciation 
  

   in 
  his 
  field 
  work, 
  but 
  it 
  will 
  be 
  understood 
  that 
  no 
  allow- 
  

   ance 
  has 
  been 
  made 
  for 
  them 
  on 
  the 
  general 
  profile 
  (Plate 
  

   V). 
  Very 
  commonly 
  what 
  appear 
  to 
  be 
  steep, 
  and 
  in 
  

   some 
  instances 
  precipitous, 
  rock 
  slopes 
  at 
  the 
  southern 
  

   ends 
  of 
  ridges 
  are 
  buried 
  under 
  till, 
  a 
  situation 
  that 
  adds 
  

   to 
  the 
  difficulty 
  of 
  definitely 
  recognizing 
  old 
  sea-cliffs. 
  

   Nevertheless, 
  steep 
  southern 
  slopes 
  appear 
  to 
  be 
  a 
  rather 
  

   characteristic 
  feature 
  of 
  Connecticut 
  topography, 
  and 
  in 
  

   this 
  connection 
  an 
  observation 
  by 
  R. 
  S. 
  Tarr, 
  made 
  in 
  

   1890, 
  is 
  of 
  interest. 
  In 
  describing 
  the 
  topography 
  of 
  the 
  

   region 
  in 
  which 
  he 
  was 
  mapping 
  glacial 
  deposits 
  he 
  said 
  : 
  

  

  ' 
  ' 
  The 
  hills 
  in 
  the 
  area 
  covered 
  by 
  the 
  Derby 
  atlas 
  sheet 
  are 
  flat 
  

   topped 
  and 
  lack 
  the 
  rounded 
  forms 
  characteristic 
  of 
  the 
  hills 
  in 
  

   Massachusetts 
  ... 
  In 
  many 
  places 
  precipices 
  are 
  found, 
  par- 
  

   ticularly 
  at 
  the 
  southern 
  ends 
  of 
  the 
  hills 
  . 
  . 
  . 
  These 
  preci- 
  

   pices 
  are 
  also 
  well 
  shown 
  in 
  the 
  neighborhood 
  of 
  Waterville, 
  

   north 
  of 
  Waterbury. 
  ' 
  ' 
  33 
  

  

  It 
  is 
  suggestive 
  that 
  three 
  of 
  Professor 
  Barrell's 
  shore- 
  

   lines 
  cross 
  the 
  Derby 
  region 
  and 
  the 
  steep 
  hills 
  near 
  

   Waterville 
  fi^L 
  the 
  position 
  of 
  a 
  fourth. 
  

  

  It 
  will 
  be 
  seen 
  that 
  the 
  Goshen 
  "shore-line," 
  the 
  loca- 
  

   tion 
  of 
  which 
  is 
  shown 
  in 
  fig. 
  1, 
  is 
  thus 
  the 
  dividing 
  line 
  

   between 
  two 
  regions 
  which 
  should 
  be 
  expected 
  to 
  show 
  

   rather 
  notable 
  differences 
  in 
  topography. 
  The 
  region 
  

   northwest 
  of 
  this 
  line 
  has 
  been 
  undergoing 
  subaerial 
  

   erosion 
  since 
  the 
  Cretaceous 
  and 
  the 
  topography 
  is 
  

  

  33 
  Unpublished 
  field 
  report. 
  

  

  