﻿Report 
  of 
  the 
  State 
  Geologist. 
  

  

  447 
  

  

  southward 
  about 
  Clarksville, 
  the 
  rate 
  of 
  dip 
  gradually 
  decreases 
  

   to 
  sixty 
  feet 
  per 
  mile, 
  aud 
  its 
  direction 
  changes 
  to 
  due 
  west. 
  

   As 
  the 
  formations 
  of 
  the 
  Helderberg 
  mountains 
  are 
  brought 
  down 
  

   to 
  the 
  general 
  country 
  level, 
  they 
  excend 
  to 
  the 
  east 
  and 
  south 
  

   into 
  a 
  flexed 
  region. 
  The 
  first 
  features 
  noticeable 
  are 
  a 
  series 
  of 
  

   gentle 
  undulations 
  which 
  broaden 
  the 
  outcrop 
  areas 
  of 
  the 
  lime- 
  

   stones 
  and 
  indent 
  their 
  edges 
  into 
  a 
  series 
  of 
  en 
  echelon 
  offsets. 
  

   These 
  undulations 
  enter 
  the 
  Helderberg 
  area 
  in 
  succession 
  from 
  

  

  -i 
  

  

  ^HHMHh 
  ^N 
  

  

  4. 
  

  

  Fig. 
  4 
  _ 
  Diagram 
  of 
  a 
  portion 
  of 
  Albany 
  county 
  to 
  illustrate 
  the 
  undulations 
  at 
  the 
  edge 
  of 
  

   the 
  folded 
  region, 
  from 
  Xew 
  Salem 
  southward. 
  Scale, 
  two 
  miles 
  to 
  one 
  inch. 
  The 
  length 
  of 
  the 
  

   stems 
  of 
  the 
  dip 
  marks 
  is 
  inversely 
  proportional 
  to 
  the 
  amount 
  of 
  dip. 
  A- 
  A.. 
  Section 
  given 
  in 
  

   figure 
  5. 
  B. 
  Section 
  in 
  figure 
  6. 
  C 
  Northern 
  section 
  on 
  plate 
  5. 
  

  

  