﻿GEOLOGY 
  OF 
  SARATOGA 
  SPRINGS 
  AND 
  VICINITY 
  II3 
  

  

  thrust 
  upon 
  Ordovicic 
  rocks 
  as 
  an 
  extensive 
  " 
  carriage," 
  is 
  one 
  

   that 
  is 
  exceedingly 
  difficult 
  of 
  solution 
  on 
  account 
  of 
  the 
  intensely 
  

   folded 
  condition 
  of 
  all 
  the 
  rocks 
  involved 
  and 
  this 
  condition 
  is 
  

   the 
  cause 
  of 
  differences 
  of 
  opinion. 
  We 
  differ 
  from 
  Dale 
  in 
  the 
  

   eastward 
  extension 
  which 
  in 
  our 
  view 
  this 
  overthrust 
  faulting 
  

   has 
  attained. 
  We 
  have 
  already 
  above 
  presented 
  evidence 
  that 
  

   some 
  of 
  the 
  " 
  outliers 
  " 
  of 
  Ordovicic 
  rocks 
  on 
  the 
  Cambric 
  

   plateau 
  are 
  not 
  such 
  simple 
  outliers, 
  as 
  claimed 
  by 
  Dale, 
  but 
  

   " 
  Fenster 
  " 
  (windows), 
  that 
  is, 
  portions 
  of 
  the 
  underlying 
  but 
  

   younger 
  Ordovicic 
  rocks 
  exposed 
  by 
  erosion, 
  and 
  the 
  very 
  small 
  out- 
  

   lier 
  of 
  Ordovicic 
  at 
  Sudbury, 
  under 
  which 
  Dale 
  1 
  found 
  Georgian 
  

   rocks 
  can 
  not 
  be 
  considered 
  as 
  vitiating 
  the 
  other 
  evidence 
  on 
  

   account 
  of 
  its 
  small 
  size 
  (but 
  50 
  square 
  meters) 
  and 
  nearness 
  to 
  

   a 
  larger 
  Ordovicic 
  body, 
  which 
  suggests 
  that 
  it 
  may 
  be 
  but 
  the 
  

   remnant 
  of 
  a 
  small 
  infolded 
  mass, 
  such 
  as 
  are 
  apt 
  to 
  occur 
  near 
  the 
  

   Georgian-Ordovicic 
  boundary 
  on 
  account 
  of 
  the 
  contorted 
  con- 
  

   dition 
  of 
  the 
  rocks. 
  Those 
  " 
  Fenster," 
  which 
  we 
  have 
  in 
  view, 
  as 
  

   especially 
  that 
  connected 
  with 
  the 
  Ordovicic 
  shale 
  belt 
  of 
  the 
  

   Hudson 
  River 
  plain 
  by 
  the 
  Deep 
  kill 
  gorge 
  (see 
  page 
  112) 
  lie 
  

   close 
  to 
  the 
  western 
  edge 
  of 
  the 
  Georgian 
  area, 
  and 
  indicate 
  an 
  

   overthrust 
  plane 
  as 
  far 
  east 
  as 
  they 
  extend. 
  We 
  see 
  strong 
  

   evidence 
  for 
  the 
  far 
  eastward 
  extension 
  of 
  the 
  overthrust 
  in 
  the 
  

   appearance 
  along 
  the 
  western 
  edge 
  of 
  the 
  Georgian 
  area 
  of 
  such 
  

   rocks 
  as 
  the 
  Bald 
  Mountain 
  limestone, 
  which 
  are 
  totally 
  different 
  

   from 
  the 
  rocks 
  of 
  the 
  northern 
  trough, 
  and 
  also 
  lacking 
  in 
  the 
  

   broad 
  belts 
  of 
  shales 
  of 
  the 
  Western 
  trough 
  to 
  the 
  north 
  and 
  south, 
  

   and 
  which 
  therefore 
  must 
  have 
  been 
  brought 
  a 
  considerable 
  distance 
  

   from 
  the 
  east, 
  if 
  we 
  will 
  not 
  assume 
  that 
  the 
  limestone 
  was' 
  again 
  

   eroded 
  over 
  most 
  of 
  the 
  area 
  before 
  or 
  during 
  the 
  deposition 
  of 
  

   the 
  Normanskill 
  shale, 
  an 
  assumption 
  that 
  seems 
  supported 
  by 
  the 
  

   Rysedorph 
  Hill 
  conglomerate. 
  

  

  The 
  evidence 
  which 
  has 
  been 
  gathered 
  by 
  us 
  in 
  this 
  relatively 
  

   small 
  area, 
  regarding 
  the 
  overthrust 
  condition 
  of 
  the 
  rocks, 
  is 
  in 
  

   full 
  accord, 
  as 
  far 
  as 
  it 
  goes, 
  with 
  the 
  views 
  expressed 
  by 
  Ulrich 
  

   in 
  the 
  Revision 
  of 
  the 
  Paleozoic 
  System, 
  page 
  442, 
  on 
  the 
  over- 
  

   thrust 
  troughs 
  in 
  eastern 
  New 
  York 
  and 
  western 
  New 
  England. 
  

  

  1 
  T. 
  Nelson 
  Dale. 
  The 
  Ordovician 
  Outlier 
  at 
  Hyde 
  Manor 
  in 
  Sudbury, 
  

   Vt. 
  Am. 
  Jour. 
  Sci., 
  33 
  197. 
  1912. 
  

  

  