﻿360 
  J. 
  Bar 
  veil 
  — 
  The 
  Piedmont 
  Terraces 
  

  

  been 
  characteristic 
  of 
  all 
  geologic 
  time 
  and 
  that, 
  on 
  the 
  

   average, 
  they 
  have 
  been 
  of 
  shorter 
  period 
  and 
  of 
  larger 
  

   amplitude 
  during 
  the 
  culminations 
  of 
  diastrophism. 
  In 
  

   the 
  later 
  parts 
  of 
  this 
  paper 
  the 
  field 
  evidence 
  from 
  Con- 
  

   necticut 
  will 
  be 
  given 
  for 
  extending 
  the 
  character 
  of 
  the 
  

   Pleistocene 
  oscillations 
  there 
  recognized, 
  as 
  well 
  as 
  in 
  

   the 
  Coastal 
  Plain, 
  backward 
  into 
  the 
  Tertiary, 
  but 
  with 
  

   longer 
  stillstands 
  between 
  periods 
  of 
  movement. 
  This 
  

   raises 
  the 
  question 
  as 
  to 
  the 
  character 
  of 
  marine 
  denuda- 
  

   tion 
  following 
  submergences 
  of 
  post-maturely 
  dissected 
  

   lands 
  to 
  an 
  extent 
  of 
  from 
  50 
  to 
  200 
  feet. 
  

  

  For 
  a 
  submergence 
  of 
  fifty 
  feet 
  or 
  less 
  the 
  valley 
  floors 
  

   would 
  be 
  flooded 
  to 
  so 
  small 
  a 
  depth 
  that 
  wave 
  action 
  

   would 
  be 
  slight. 
  The 
  chief 
  line 
  of 
  marine 
  attack 
  would 
  

   be 
  upon 
  the 
  more 
  prominent 
  parts 
  of 
  the 
  coast 
  ; 
  vigorous 
  

   wave 
  erosion 
  of 
  headlands 
  would 
  be 
  stimulated 
  and 
  a 
  

   mature 
  coast 
  would 
  be 
  made 
  young. 
  

  

  For 
  a 
  submergence 
  of 
  200 
  feet, 
  which 
  is 
  about 
  the 
  

   average 
  interval 
  between 
  the 
  terraces 
  in 
  Connecticut, 
  the 
  

   conditions 
  would 
  be 
  quite 
  different, 
  for 
  the 
  depth 
  of 
  wave 
  

   action 
  in 
  epeiric 
  seas 
  would 
  be 
  approached. 
  Lowlands 
  

   would 
  be 
  broadly 
  flooded 
  and 
  under 
  favorable 
  conditions 
  

   transformed 
  into 
  such 
  bodies 
  of 
  water 
  as 
  the 
  North 
  Sea, 
  

   the 
  Baltic, 
  or 
  Hudson 
  Bay. 
  An 
  entirely 
  new 
  coast 
  line 
  

   would 
  result, 
  exposed 
  to 
  notable 
  wave 
  action 
  at 
  and 
  near 
  

   the 
  shore. 
  The 
  waves 
  from 
  the 
  ocean, 
  encountering 
  no 
  

   offshore 
  bottom, 
  would 
  roll 
  with 
  undiminished 
  force 
  

   against 
  the 
  coast 
  and 
  a 
  new 
  facet 
  of 
  marine 
  denudation 
  

   would 
  be 
  planed 
  inland 
  in 
  a 
  short 
  time. 
  On 
  the 
  shore 
  of 
  

   each 
  embayment 
  wave 
  action 
  would 
  also 
  proceed, 
  but 
  with 
  

   less 
  intensity 
  than 
  on 
  the 
  outer 
  shore 
  and 
  varying 
  with 
  

   the 
  depth 
  and 
  width 
  of 
  the 
  water 
  body. 
  

  

  For 
  several 
  reasons 
  the 
  submergence 
  of 
  a 
  coast 
  to 
  the 
  

   extent 
  of 
  about 
  200 
  feet 
  and 
  the 
  consequent 
  erosion 
  

   phenomena 
  furnish 
  important 
  evidence 
  for 
  the 
  recogni- 
  

   tion 
  of 
  marine 
  planation. 
  First, 
  wave 
  attack 
  is 
  not 
  only 
  

   against 
  the 
  outer 
  coast 
  line 
  but 
  is 
  repeated 
  on 
  various 
  

   minor 
  scales 
  along 
  all 
  embayments, 
  especially 
  on 
  their 
  

   windward 
  sides. 
  Second, 
  wave 
  action 
  attacks 
  a 
  surface 
  

   shaped 
  by 
  fluvial 
  denudation. 
  The 
  result 
  at 
  first 
  would 
  

   be 
  a 
  fluvial 
  surface 
  modified 
  by 
  wave 
  action. 
  In 
  the 
  end, 
  

   however, 
  there 
  would 
  result 
  a 
  true 
  marine 
  peneplane, 
  and 
  

   it 
  would 
  be 
  generated 
  the 
  more 
  rapidly 
  because 
  the 
  bulk 
  

   of 
  the 
  erosion 
  had 
  been 
  previously 
  accomplished 
  by 
  sub- 
  

   aerial 
  agencies 
  and 
  the 
  surface 
  left 
  in 
  a 
  condition 
  favor- 
  

  

  