﻿Report 
  of 
  the 
  State 
  Geologisi. 
  565 
  

  

  The 
  narrowest 
  part 
  in 
  the 
  terrace 
  is 
  a 
  mile 
  north 
  of 
  Rondout, 
  

   where 
  its 
  width 
  is 
  not 
  over 
  200 
  yards. 
  In 
  the 
  yards 
  of 
  Terry 
  

   Brothers 
  the 
  clay 
  has 
  been 
  quarried 
  back 
  to 
  the 
  old 
  shore 
  line 
  of 
  

   the 
  deposits, 
  which 
  is 
  a 
  high 
  overhanging 
  cliff 
  of 
  Helderberg 
  

   limestone. 
  The 
  relations 
  at 
  this 
  locality 
  are 
  shown 
  in 
  plate 
  22. 
  

  

  This 
  high, 
  steep 
  shore 
  extends 
  for 
  some 
  distance 
  in 
  this 
  region, 
  

   but 
  lies 
  farther 
  back 
  from 
  the 
  river 
  elsewhere. 
  

  

  In 
  the 
  "Walkill, 
  Rondout 
  and 
  Esopus 
  valleys 
  the 
  Champlain 
  

   deposits 
  are 
  thick 
  and 
  extensive. 
  East 
  of 
  Rosendale 
  there 
  is 
  a 
  

   wide 
  sand 
  plain 
  of 
  the 
  upper 
  member 
  extending 
  from 
  the 
  Ron- 
  

   dout 
  creek 
  to 
  the 
  Walkill. 
  In 
  the 
  Rondout 
  valley 
  above 
  High 
  

   Falls 
  the 
  clay 
  deposits 
  are 
  very 
  thick 
  and 
  they 
  rise 
  in 
  high 
  ter- 
  

   races 
  along 
  the 
  turnpike 
  and 
  eastward. 
  At 
  Pine 
  Bush 
  the 
  sand 
  

   member 
  is 
  conspicuous, 
  constituting 
  a 
  high, 
  narrow 
  ridge 
  trend- 
  

   ing 
  eastward 
  and 
  separating 
  the 
  Mombaccus 
  and 
  Rondout 
  creeks. 
  

   The 
  lower 
  portion 
  of 
  this 
  ridge 
  is 
  clay 
  apparently, 
  which 
  extends 
  

   to 
  its 
  base. 
  

  

  It 
  is 
  thought 
  that 
  the 
  low 
  divides 
  of 
  the 
  Catskill 
  are 
  due 
  to 
  

   glacial 
  action, 
  mainly 
  to 
  the 
  diversion 
  of 
  streams 
  by 
  ice 
  dams 
  

  

  Wagonwheel 
  gap 
  from 
  Satupaonvilie. 
  Looking 
  north. 
  

  

  Possibly 
  they 
  were 
  in 
  part 
  pre-existent 
  as 
  part 
  of 
  an 
  early 
  base 
  

   level 
  system, 
  but 
  this 
  possibility 
  has 
  not 
  yet 
  been 
  carefully 
  con- 
  

   sidered. 
  They 
  are 
  largely 
  in 
  the^direction 
  of 
  the 
  ice 
  movement. 
  

  

  