﻿24:8 
  J. 
  Barrett 
  — 
  The 
  Piedmont 
  Terraces 
  

  

  Sound 
  and 
  taking 
  advantage 
  of 
  the 
  directions 
  of 
  folia- 
  

   tion, 
  though 
  not 
  located 
  for 
  long 
  distances 
  on 
  any 
  one 
  

   set 
  of 
  beds. 
  

  

  The 
  eastern* 
  upland, 
  in 
  the 
  northern 
  part 
  of 
  the 
  state, 
  

   has 
  broad 
  areas 
  slightly 
  above 
  800 
  feet 
  in 
  elevation, 
  

   widely 
  isolated 
  hills 
  rise 
  to 
  1,000 
  feet, 
  and 
  the 
  culminat- 
  

   ing 
  points 
  range 
  between 
  1,200 
  and 
  1,300 
  feet. 
  The 
  

   principal 
  valleys 
  have 
  elevations 
  between 
  500 
  and 
  700 
  

   feet 
  above 
  the 
  sea. 
  The 
  elevations 
  of 
  these 
  three 
  ele- 
  

   ments 
  of 
  the 
  upland 
  surface 
  descend 
  toward 
  the 
  south 
  

   and 
  to 
  some 
  degree 
  approach 
  each 
  other. 
  For 
  some 
  

   miles 
  back 
  from 
  the 
  shore 
  the 
  river 
  valleys 
  are 
  drowned, 
  

   the 
  higher 
  hilltops 
  are 
  flatter 
  and 
  occupy 
  a 
  larger 
  area 
  ; 
  

   the 
  region 
  as 
  a 
  whole 
  has 
  less 
  relief 
  than 
  farther 
  north 
  

   and 
  is 
  physiographic-ally 
  younger. 
  

  

  In 
  the 
  northern 
  half 
  of 
  the 
  eastern 
  upland 
  the 
  rock 
  

   formations, 
  in 
  part, 
  lie 
  in 
  distinct 
  belts 
  striking 
  slightly 
  

   east 
  of 
  north 
  and 
  the 
  drainage 
  is 
  well 
  adjusted 
  to 
  struc- 
  

   ture. 
  In 
  the 
  southern 
  half 
  there 
  is 
  a 
  greater 
  proportion 
  

   of 
  granite 
  in 
  large 
  irregular 
  masses 
  and 
  the 
  drainage 
  

   shows 
  little 
  relation 
  to 
  structure. 
  The 
  Connecticut 
  flows 
  

   south-east 
  diagonal 
  to 
  resistant 
  formations, 
  pointing 
  to 
  

   an 
  origin 
  through 
  superposition. 
  

  

  The 
  central 
  lowland 
  is 
  from 
  15 
  to 
  20 
  miles 
  wide 
  over 
  

   most 
  of 
  its 
  area 
  but 
  narrows 
  at 
  its 
  southern 
  end. 
  It 
  is 
  

   determined 
  by 
  the 
  weak 
  Trias 
  sic 
  shales 
  and 
  sandstones. 
  

   Over 
  broad 
  areas 
  it 
  is 
  a 
  gently 
  hilly 
  country 
  between 
  100 
  

   and 
  200 
  feet 
  above 
  sea-level, 
  although 
  away 
  from 
  the 
  

   principal 
  rivers 
  the 
  average 
  elevation 
  will 
  range 
  a 
  hun- 
  

   dred 
  feet 
  higher. 
  The 
  rivers 
  are 
  trenched 
  below 
  the 
  

   general 
  level 
  in 
  youthful 
  valleys, 
  indicating 
  a 
  moderate 
  

   uplift 
  since 
  the 
  lowland 
  was 
  developed. 
  The 
  continuity 
  

   of 
  the 
  lowland 
  surface 
  is 
  interrupted 
  by 
  many 
  trap 
  

   ridges 
  which 
  rise 
  to 
  elevations 
  of 
  200 
  to 
  400 
  feet 
  near 
  the 
  

   shore 
  and 
  of 
  700 
  to 
  1,000 
  feet 
  over 
  the 
  greater 
  part 
  of 
  the 
  

   lowland. 
  Views 
  from 
  the 
  crests 
  of 
  the 
  higher 
  ridges 
  

   show 
  that 
  they 
  lie 
  at 
  about 
  the 
  elevations 
  of 
  the 
  adjacent 
  

   uplands 
  and 
  must 
  represent 
  with 
  them 
  the 
  remnants 
  of 
  

   older 
  baselevels 
  of 
  erosion. 
  

  

  Thus 
  from 
  the 
  point 
  of 
  view 
  of 
  origin, 
  the 
  distinction 
  

   between 
  the 
  central 
  lowland 
  and 
  the 
  upland 
  largely 
  

   breaks 
  down. 
  The 
  higher 
  parts 
  of 
  the 
  lowland 
  are 
  an 
  

   integral 
  part 
  of 
  the 
  upland 
  and 
  the 
  lower 
  parts 
  of 
  the 
  

   upland, 
  especially 
  near 
  the 
  shore, 
  are 
  part 
  of 
  the 
  lowland. 
  

  

  