﻿of 
  the 
  Northern 
  Appalachians. 
  229 
  

  

  3. 
  Construction 
  of 
  projected 
  profiles 
  covering 
  a 
  belt 
  

   of 
  country 
  90 
  miles 
  long 
  and 
  about 
  20 
  wide 
  in 
  western 
  

   Connecticut 
  and 
  Massachusetts 
  on 
  a 
  scale 
  1 
  : 
  62,500 
  show- 
  

   ing 
  the 
  broad 
  stair-like 
  terraces 
  and 
  the 
  assumed 
  posi- 
  

   tions 
  of 
  shore-lines. 
  Also 
  a 
  similar 
  profile 
  of 
  an 
  area 
  

   40 
  by 
  55 
  miles 
  in 
  Maryland, 
  besides 
  others 
  covering 
  the 
  

   Harvey 
  Lake-Pittston-Scranton 
  region 
  of 
  Pennsylvania 
  

   and 
  part 
  of 
  the 
  Cat 
  skills. 
  In 
  addition 
  a 
  large 
  number 
  of 
  

   maps 
  and 
  profiles 
  of 
  special 
  areas 
  were 
  drawn 
  to 
  show 
  

   clearly 
  the 
  character 
  of 
  the 
  terraces 
  and 
  shore-lines. 
  

  

  4. 
  Tentative 
  correlation 
  of 
  the 
  terraces 
  of 
  different 
  

   regions. 
  

  

  5. 
  Preliminary 
  profile 
  sketches 
  showing 
  (a) 
  present 
  

   relations 
  of 
  principal 
  peneplanes 
  in 
  New 
  England, 
  (b) 
  

   relations 
  of 
  peneplanes 
  and 
  contemporaneous 
  sediments, 
  

   and 
  extent 
  of 
  overlaps, 
  (c) 
  time 
  relations 
  of 
  the 
  Connect- 
  

   icut 
  marine 
  terraces. 
  

  

  6. 
  Projection 
  inland 
  of 
  the 
  planes 
  of 
  unconformity 
  

   between 
  the 
  sedimentary 
  formations 
  of 
  the 
  Coastal 
  Plain 
  

   in 
  order 
  to 
  fix 
  the 
  age 
  of 
  the 
  Piedmont 
  and 
  Appalachian 
  

   erosion 
  surfaces. 
  

  

  7. 
  Restoration 
  of 
  former 
  river 
  grades 
  based 
  on 
  data, 
  

   such 
  as 
  wind 
  gaps 
  and 
  rock 
  benches, 
  obtained 
  from 
  the 
  

   study 
  of 
  the 
  topographic 
  maps. 
  

  

  8. 
  A 
  study 
  of 
  marine 
  benches 
  and 
  their 
  associated 
  

   deposits 
  on 
  different 
  types 
  of 
  coast. 
  This 
  study 
  was 
  

   begun 
  some 
  years 
  before 
  the 
  terrace 
  problem 
  was 
  taken 
  

   up 
  primarily 
  for 
  the 
  purpose 
  of 
  developing 
  criteria 
  for 
  

   the 
  recognition 
  of 
  marine 
  and 
  terrestrial 
  conglomerates. 
  

   Some 
  phases 
  of 
  it, 
  however, 
  were 
  seen 
  to 
  have 
  so 
  inti- 
  

   mate 
  a 
  bearing 
  on 
  the 
  latter 
  problem 
  as 
  to 
  call 
  for 
  fur- 
  

   ther 
  investigation. 
  This 
  applied 
  particularly 
  to 
  marine 
  

   conglomerates 
  and 
  to 
  fluvial 
  conglomerates 
  that 
  had 
  been 
  

   reworked 
  by 
  the 
  sea. 
  

  

  9. 
  Preliminary 
  outline 
  and 
  notes 
  for 
  a 
  paper 
  on 
  the 
  

   "Evolution 
  of 
  the 
  New 
  England 
  Drainage.' 
  ' 
  

  

  The 
  foregoing 
  is 
  largely 
  a 
  record 
  of 
  laboratory 
  work. 
  

   The 
  study 
  in 
  its 
  broader 
  aspects 
  was 
  based, 
  in 
  fact 
  had 
  

   to 
  be 
  based, 
  on 
  topographic 
  maps, 
  but 
  this 
  study 
  in 
  turn 
  

   was 
  founded 
  on 
  and 
  controlled 
  by 
  field 
  work. 
  Professor 
  

   Barrell's 
  note 
  books 
  record 
  such 
  work 
  in 
  New 
  England 
  

   during 
  the 
  summers 
  of 
  1911, 
  1912, 
  and 
  1913 
  ; 
  in 
  Pennsyl- 
  

   vania 
  in 
  1912 
  and 
  1913 
  ; 
  and 
  in 
  Maryland 
  in 
  1912. 
  He 
  

   adopted 
  the 
  method 
  of 
  map 
  study 
  partly 
  from 
  necessity 
  

   and 
  partly, 
  no 
  doubt, 
  because 
  it 
  enabled 
  him 
  to 
  accom- 
  

  

  