﻿IOO 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  regions 
  the 
  folding 
  has 
  transgressed 
  a 
  few 
  miles 
  into 
  the 
  Cana- 
  

   joharie 
  shale 
  area 
  while 
  in 
  others 
  some 
  western 
  marginal 
  cakes 
  of 
  

   the 
  Snake 
  Hill 
  beds 
  have 
  been 
  left 
  only 
  shattered 
  by 
  fault 
  slips. 
  

   Thus 
  in 
  Albany 
  county 
  the 
  Canajoharie 
  shale 
  belt 
  striking 
  along 
  

   the 
  Hudson 
  river 
  has 
  become, 
  partly 
  at 
  least, 
  involved 
  in 
  the 
  fold- 
  

   ing, 
  while 
  on 
  the 
  Saratoga 
  sheet 
  the 
  Snake 
  Hill 
  shales 
  west 
  of 
  

   Saratoga 
  lake 
  are 
  only 
  tilted 
  and 
  broken. 
  The 
  boundary 
  between 
  

   the 
  folded 
  and 
  unfolded 
  areas 
  follows 
  thus 
  on 
  the 
  Schuylerville 
  

   quadrangle 
  the 
  longer 
  axis 
  of 
  Saratoga 
  lake, 
  being 
  probably 
  in 
  

   part 
  responsible 
  for 
  the 
  existence 
  of 
  this 
  basin 
  in 
  that 
  place. 
  It 
  

   thence 
  continues 
  northwest 
  passing 
  west 
  of 
  Kendricks 
  hill 
  where 
  

   folded 
  Snake 
  Hill 
  shales 
  are 
  exposed. 
  The 
  folded 
  area 
  may 
  also 
  

   include 
  the 
  last 
  outcrops 
  of 
  Canajoharie 
  shale 
  on 
  the 
  Snook 
  kill 
  

   below 
  Gansevoort, 
  the 
  shale 
  being 
  there 
  in 
  steeply 
  eastward 
  dip- 
  

   ping 
  position. 
  

  

  In 
  general, 
  however, 
  the 
  boundary 
  of 
  the 
  folded 
  and 
  unfolded 
  

   regions 
  coincides 
  so 
  closely 
  with 
  the 
  Canajoharie-Snake 
  Hill 
  bound- 
  

   ary 
  that 
  the 
  proposition 
  of 
  the 
  folding 
  and 
  shoving 
  of 
  the 
  eastern 
  

   series 
  of 
  shales 
  upon 
  and 
  against 
  the 
  western 
  is 
  well 
  supported 
  by 
  

   this 
  fact. 
  The 
  crumpling 
  up 
  of 
  a 
  narrow 
  belt 
  of 
  Canajoharie 
  shale 
  

   in 
  front 
  of 
  the 
  folded 
  area 
  in 
  Albany 
  county 
  on 
  one 
  hand 
  and 
  the 
  

   shoving 
  westward 
  of 
  a 
  cake 
  of 
  Snake 
  Hill 
  beds 
  without 
  folding 
  

   (but 
  with 
  much 
  slipping, 
  see 
  below 
  page 
  103) 
  in 
  Saratoga 
  county 
  

   on 
  the 
  other 
  hand, 
  both 
  result 
  from 
  the 
  varying 
  resistance 
  offered 
  

   the 
  oncoming 
  waves 
  of 
  pressure 
  and 
  of 
  folds 
  from 
  the 
  east, 
  

   through 
  the 
  thickness 
  of 
  the 
  opposing 
  strata 
  and 
  the 
  weight 
  of 
  

   their 
  covering 
  formations. 
  It 
  appears 
  from 
  the 
  fact 
  that 
  some 
  

   of 
  the 
  outcrops 
  on 
  the 
  southeast 
  shore 
  of 
  Saratoga 
  lake 
  (on 
  the 
  

   Cohoes 
  quadrangle) 
  show 
  a 
  great 
  number 
  of 
  closely 
  arranged 
  

   thrust 
  planes, 
  all 
  rising 
  slightly 
  to 
  the 
  west, 
  that 
  the 
  pushing 
  force 
  

   in 
  this 
  more 
  or 
  less 
  unfolded 
  western 
  cake 
  was 
  largely 
  spent 
  in 
  

   overthrusting, 
  this 
  action 
  taking 
  place 
  near 
  the 
  surface 
  under 
  little 
  

   or 
  no 
  cover. 
  

  

  We 
  have 
  shown 
  before 
  that 
  the 
  Canajoharie 
  and 
  Snake 
  Hill 
  

   beds 
  belong 
  to 
  different 
  series 
  of 
  rocks, 
  deposited 
  in 
  different 
  

   basins. 
  Of 
  these 
  the 
  Canajoharie 
  shales 
  have 
  changed 
  their 
  posi- 
  

   tion 
  on 
  the 
  whole 
  only 
  vertically 
  through 
  normal 
  faulting, 
  while 
  

   the 
  folded 
  shales 
  must 
  have 
  been 
  transported 
  for 
  some 
  distance 
  

   subhorizontally 
  to 
  come 
  to 
  lie 
  in 
  contact 
  with 
  and 
  partly 
  above 
  

   the 
  western 
  series. 
  This 
  transportation 
  took 
  place 
  both 
  by 
  

   folding 
  and 
  overthrust 
  faulting. 
  There 
  is 
  little 
  doubt 
  that 
  the 
  

  

  