﻿GEOLOGY 
  OF 
  SARATOGA 
  SPRINGS 
  AND 
  VICINITY 
  

  

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  Hathorn 
  spring 
  record. 
  The 
  deep 
  bore 
  at 
  the 
  Hathorn 
  spring 
  

   went 
  down 
  1006 
  feet. 
  The 
  driller 
  reported 
  62 
  feet 
  of 
  drift 
  at 
  the 
  

   top 
  and 
  231 
  feet 
  of 
  Potsdam 
  sandstone 
  at 
  the 
  bottom, 
  the 
  drill 
  rest- 
  

   ing: 
  in 
  this 
  formation. 
  Amster- 
  _, 
  

  

  • 
  r 
  LU 
  CO 
  VZ 
  u 
  

  

  dam 
  limestone 
  was 
  found 
  di- 
  

   rectly 
  under 
  the 
  drift. 
  The 
  

   Potsdam 
  is 
  so 
  thick 
  that 
  it 
  seems 
  

   that 
  the 
  full 
  thickness 
  of 
  the 
  

   Theresa 
  must 
  also 
  be 
  included. 
  

   If 
  this 
  be 
  the 
  case, 
  the 
  Hoyt, 
  

   Little 
  Falls, 
  and 
  Amsterdam 
  

   have 
  a 
  combined 
  thickness 
  of 
  

   713 
  feet, 
  whereas 
  judging 
  by 
  

   such 
  other 
  evidence 
  as 
  we 
  have 
  

   of 
  their 
  thickness 
  it 
  should 
  not 
  

   exceed 
  450 
  to 
  500 
  feet. 
  This 
  

   suggests 
  that 
  the 
  drill 
  may 
  have 
  

   crossed 
  a 
  fault 
  so 
  as 
  to 
  go 
  

   through 
  a 
  certain 
  thickness 
  of 
  

   beds 
  twice. 
  This 
  would 
  be 
  quite 
  

   possible 
  since 
  the 
  drilling 
  started 
  

   on 
  the 
  Amsterdam 
  wedge 
  and 
  it 
  

   is 
  only 
  necessary 
  to 
  assume 
  that 
  

   the 
  branch 
  of 
  the 
  fault 
  east 
  of 
  

   the 
  wedge 
  hades 
  toward 
  the 
  

   main 
  fault 
  in 
  order 
  to 
  have 
  just 
  

   the 
  necessary 
  conditions,. 
  as 
  illus- 
  

   trated 
  in 
  figure 
  8. 
  The 
  drill 
  core 
  

   is 
  in 
  existence 
  but 
  we 
  have 
  not 
  

   had 
  opportunity 
  to 
  study 
  it. 
  

   Such 
  study 
  should 
  show 
  whether 
  

   any 
  part 
  of 
  the 
  section 
  is 
  dupli- 
  

   cated 
  in 
  the 
  record 
  or 
  not. 
  If 
  

   there 
  is 
  duplication 
  the 
  illustra- 
  

   tion 
  probably 
  furnishes 
  the 
  

   reason. 
  If 
  there 
  is 
  none, 
  then 
  

   the 
  Little 
  Falls 
  dolomite 
  and 
  J 
  a 
  "3.8 
  

  

  Hoyt 
  limestone 
  taken 
  together 
  are 
  considerably 
  thicker 
  than 
  we 
  have 
  

   supposed. 
  

  

  General 
  remarks 
  on 
  the 
  faults. 
  The 
  large 
  faults 
  of 
  the 
  Mo- 
  

   hawk 
  and 
  eastern 
  Adirondack 
  regions 
  show 
  a 
  frequent 
  tendency 
  

  

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