﻿104 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  same 
  lake 
  (on 
  the 
  Schenectady 
  quadrangle) 
  many 
  such 
  overthrust 
  

   faults 
  were 
  observed; 
  in 
  one 
  place 
  three 
  above 
  each 
  other. 
  They 
  

   all 
  dip 
  southeast, 
  mostly 
  at 
  an 
  angle 
  of 
  about 
  25 
  °. 
  Others 
  were 
  

   observed 
  in 
  the 
  bed 
  of 
  Fish 
  creek 
  at 
  Victory 
  Mills 
  and 
  in 
  road 
  

   metal 
  pits. 
  In 
  one 
  place, 
  a 
  road 
  metal 
  pit 
  east 
  of 
  Saratoga 
  lake, 
  

   the 
  slickensides 
  upon 
  the 
  thrust 
  planes, 
  and 
  especially 
  the 
  direc- 
  

   tion 
  of 
  the 
  slickenside 
  scales, 
  left 
  no 
  doubt 
  that 
  the 
  upthrow 
  side 
  

   had 
  moved 
  from 
  east 
  to 
  west 
  upon 
  that 
  plane. 
  Some 
  of 
  these 
  

   overthrust 
  faults 
  have 
  clearly 
  resulted 
  from 
  overturned 
  folds 
  

   (fold 
  thrusts). 
  The 
  upper 
  leg 
  is 
  seen 
  in 
  such 
  cases 
  to 
  have 
  been 
  

   pushed 
  westward 
  beyond 
  the 
  lower. 
  Some 
  instructive 
  examples 
  

   of 
  this 
  were 
  seen 
  about 
  Saratoga 
  lake, 
  especially 
  on 
  Snake 
  hill. 
  

   Most 
  of 
  these 
  small 
  faults 
  run 
  with 
  the 
  general 
  strike 
  (north- 
  

   northeast 
  direction) 
  of 
  the 
  beds 
  or 
  are 
  strike 
  faults 
  ; 
  some 
  were, 
  

   however, 
  observed 
  which 
  cut 
  the 
  beds 
  obliquely, 
  as 
  one 
  at 
  Victory 
  

   Mills, 
  striking 
  N. 
  6o° 
  E. 
  These 
  deviations 
  from 
  the 
  general 
  north- 
  

   northeast 
  direction 
  are 
  probably 
  connected 
  with 
  local 
  irregularities 
  

   in 
  the 
  general 
  trend 
  of 
  the 
  folds. 
  

  

  While 
  the 
  throw 
  of 
  each 
  of 
  these 
  overthrust 
  faults 
  is 
  but 
  small, 
  

   their 
  accumulative 
  effect, 
  going 
  from 
  west 
  to 
  east, 
  owing 
  to 
  their 
  

   great 
  number 
  and 
  uniform 
  direction 
  of 
  throw, 
  must 
  be 
  quite 
  

   large. 
  If 
  we 
  assume 
  a 
  throw 
  of 
  6 
  inches 
  for 
  each 
  fault 
  and 
  

   that 
  they 
  are 
  20 
  feet 
  apart, 
  we 
  obtain 
  for 
  the 
  belt 
  measured 
  

   from 
  the 
  foot 
  of 
  Willard 
  mountain 
  normal 
  to 
  the 
  strike, 
  with 
  a 
  

   width 
  of 
  10 
  miles, 
  a 
  compound 
  throw 
  of 
  1320 
  feet. 
  The 
  effect 
  

   of 
  this 
  accumulative 
  throw 
  would 
  be 
  to 
  bring 
  progressively 
  older 
  

   beds 
  to 
  the 
  surface 
  of 
  the 
  Saratoga 
  plain 
  as 
  one 
  goes 
  east. 
  It 
  is 
  

   therefore 
  possible 
  that 
  the 
  position 
  of 
  the 
  Normanskill 
  belts 
  to 
  

   the 
  east 
  of 
  the 
  Snake 
  Hill 
  belts 
  is 
  largely 
  due 
  to 
  this 
  effect 
  of 
  the' 
  

   small 
  numerous 
  overthrust 
  faults 
  which 
  might 
  be 
  termed 
  " 
  pro- 
  

   gressive 
  over 
  thrusts!' 
  

  

  The 
  interesting 
  observations 
  of 
  Woodworth 
  1 
  have 
  shown 
  that 
  

   faulting 
  of 
  " 
  repetitive 
  '.' 
  character 
  is 
  still 
  going 
  on 
  in 
  the 
  shale 
  

   belts 
  to 
  the 
  south 
  of 
  the 
  Schuylerville 
  quadrangle 
  and 
  possibly 
  also 
  

   in 
  the 
  latter. 
  These 
  small 
  faults 
  have 
  also 
  the 
  same 
  northeast 
  

   strike 
  and 
  where 
  observed, 
  raise 
  the 
  eastern 
  part 
  above 
  the 
  west- 
  

  

  1 
  Woodworth, 
  J. 
  B. 
  Postglacial 
  Faults 
  of 
  Eastern 
  New 
  York. 
  N. 
  Y. 
  State 
  

   Mus. 
  Bui. 
  107, 
  p. 
  5, 
  1907. 
  

  

  