﻿of 
  the 
  Northern 
  Appalachians. 
  

  

  343 
  

  

  view 
  and 
  refinement 
  in 
  drawing 
  that 
  is 
  rarely 
  attempted 
  

   on 
  maps 
  on 
  a 
  scale 
  of 
  1: 
  62,500. 
  On 
  the 
  older 
  maps 
  

   spurs 
  may 
  be 
  smoothed 
  over, 
  or 
  if 
  located 
  by 
  the 
  topog- 
  

   rapher 
  from 
  the 
  valley 
  below, 
  may 
  be 
  shown 
  with 
  errors 
  

   in 
  elevation 
  of 
  100 
  to 
  200 
  feet. 
  One 
  locality, 
  however, 
  

   where 
  the 
  uplifted 
  valley 
  floor 
  is 
  so 
  wide 
  and 
  well 
  pre- 
  

  

  Fig. 
  10. 
  

  

  Fig. 
  10. 
  — 
  Projected 
  profile 
  of 
  valley 
  of 
  Delaware 
  Eiver 
  from 
  one 
  mile 
  

   north 
  of 
  Dingman's 
  Ferry 
  to 
  Smith's 
  Ferry. 
  (1) 
  Medina 
  and 
  Oneida 
  

   sandstone, 
  (2) 
  Salina 
  shale, 
  (3) 
  Oriskany 
  sandstone, 
  (4) 
  Hamilton 
  sand- 
  

   stone, 
  and 
  (5) 
  Catskill 
  sandstone 
  and 
  shale. 
  

  

  served 
  that 
  it 
  does 
  show 
  clearly 
  on 
  the 
  topographic 
  map 
  

   is 
  found 
  on 
  the 
  Delaware 
  River 
  in 
  the 
  Wallpack 
  (Pa.) 
  

   quadrangle. 
  The 
  projected 
  profile 
  of 
  this 
  locality, 
  look- 
  

   ing 
  southwest 
  (down 
  the 
  valley) 
  from 
  one 
  mile 
  north 
  of 
  

   Dingman's 
  Ferry 
  to 
  Smith's 
  Ferry, 
  is 
  shown 
  in 
  fig. 
  10. 
  

   This 
  section 
  of 
  the 
  Delaware 
  is 
  adjusted 
  to 
  structure 
  

  

  Am. 
  Jour. 
  Sci.— 
  Fourth 
  Series, 
  Vol. 
  XLIX, 
  No. 
  293.— 
  May, 
  1920. 
  

   25 
  

  

  