﻿GEOLOGY 
  OF 
  SARATOGA 
  SPRINGS 
  AND 
  VICINITY 
  57 
  

  

  a 
  small 
  fraction 
  of 
  its 
  original 
  throw, 
  the 
  remainder 
  being 
  taken 
  up 
  

   apparently 
  by 
  the 
  branch 
  faults 
  (West 
  and 
  East 
  Galway 
  faults). 
  

   Across 
  the 
  Saratoga 
  quadrangle 
  the 
  main 
  fault 
  rapidly 
  regains 
  its 
  

   original 
  amount 
  of 
  throw. 
  This 
  would 
  naturally 
  suggest 
  a 
  loss 
  of 
  

   throw 
  in 
  the 
  case 
  of 
  the 
  two 
  branch 
  faults, 
  and 
  such 
  meager 
  evidence 
  

   as 
  we 
  have 
  in 
  regard 
  to 
  them 
  is 
  corroborative 
  of 
  this 
  suggestion. 
  

  

  West 
  Galway 
  fault. 
  The 
  West 
  and 
  East 
  Galway 
  faults 
  enter 
  

   the 
  Saratoga 
  quadrangle 
  near 
  its 
  southwestern 
  corner 
  and 
  not 
  greatly 
  

   over 
  half 
  a 
  mile 
  apart. 
  They 
  are 
  easily 
  traced 
  for 
  3 
  or 
  4 
  miles 
  

   when 
  they 
  run 
  into 
  heavily 
  drift-covered 
  territory 
  in 
  which 
  their 
  

   course, 
  and 
  even 
  their 
  existence, 
  is 
  quite 
  uncertain. 
  Where 
  outcrops 
  

   reappear, 
  in 
  the 
  northern 
  portion 
  of 
  the 
  quadrangle, 
  two 
  faults 
  are 
  

   found 
  which 
  are 
  on 
  the 
  trend 
  of 
  these 
  two, 
  and 
  they 
  are 
  assumed 
  

   to 
  be 
  their 
  prolongations 
  ; 
  but 
  the 
  uncertainty 
  of 
  this 
  must 
  be 
  em- 
  

   phasized. 
  If 
  the 
  assumption 
  is 
  correct, 
  interesting 
  consequences 
  

   follow. 
  

  

  South 
  of 
  East 
  Galway 
  the 
  ravine 
  that 
  runs 
  across 
  the 
  West 
  Galway 
  

   fault, 
  and 
  which 
  cuts 
  down 
  into 
  the 
  Precambric 
  just 
  west 
  of 
  the 
  

   fault 
  line 
  (see 
  areal 
  map), 
  gives 
  the 
  data 
  for 
  an 
  approximate 
  esti- 
  

   mate 
  of 
  the 
  fault's 
  throw 
  at 
  that 
  point. 
  The 
  Precambric 
  is 
  on 
  one 
  

   side, 
  the 
  upper 
  portion 
  of 
  the 
  Theresa 
  formation 
  on 
  the 
  other, 
  so 
  

   that 
  the 
  throw 
  is 
  just 
  about 
  equivalent 
  to 
  the 
  combined 
  thicknesses 
  

   of 
  the 
  Potsdam 
  and 
  Theresa 
  formations, 
  or 
  from 
  250 
  to 
  300 
  feet. 
  

  

  Near 
  this 
  point, 
  one 
  and 
  one-half 
  miles 
  south 
  of 
  East 
  Galway, 
  

   there 
  is 
  a 
  dropped 
  wedge 
  of 
  rock, 
  or 
  

   horse, 
  along 
  the 
  West 
  Galway 
  fault, 
  

   which 
  is 
  interesting 
  because 
  the 
  rock 
  

   concerned 
  is 
  much 
  younger 
  than 
  on 
  

   either 
  side 
  of 
  the 
  fault. 
  Potsdam 
  sand- 
  

   stone 
  adjoins 
  it 
  on 
  the 
  west 
  or 
  upthrow 
  

   side 
  of 
  the 
  fault, 
  and 
  the 
  upper 
  beds 
  of 
  

   the 
  Theresa 
  formation 
  on 
  the 
  other 
  side, 
  

   the 
  downthrow. 
  The 
  rock 
  of 
  the 
  in- 
  

   cluded 
  wedge 
  is 
  upper 
  Little 
  Falls 
  and 
  Fig. 
  5 
  Plan 
  of 
  outcrops 
  on 
  

  

  basal 
  Amsterdam, 
  hence 
  higher 
  in 
  the 
  the 
  West 
  Galway 
  fault, 
  show- 
  

  

  fe 
  mg 
  the 
  wedge 
  with 
  Little 
  

  

  section 
  than 
  the 
  Theresa 
  on 
  the 
  down- 
  Falls 
  dolomite 
  at 
  the 
  north 
  

  

  throw 
  side 
  by 
  the 
  full 
  thickness 
  of 
  the 
  «£ 
  S"™f 
  add*- 
  

  

  Little 
  Falls 
  dolomite, 
  at 
  least 
  300 
  feet, 
  tional 
  outcrops, 
  no. 
  1 
  of 
  

  

  17;™-!*.^ 
  1- 
  „t,~„ 
  „ 
  „ 
  ~i 
  r 
  j-t- 
  i. 
  Theresa 
  beds 
  and 
  no. 
  2 
  of 
  

  

  figure 
  5 
  shows 
  a 
  plan 
  of 
  the 
  outcrops 
  Pot 
  sdam 
  sandstone. 
  

  

  and 
  our 
  interpretation 
  of 
  the 
  relations. 
  Scale 
  1 
  inch=350 
  yards. 
  

   The 
  wedge 
  of 
  Little 
  Falls 
  and 
  Amsterdam 
  shows 
  abundant 
  out- 
  

   crops. 
  At 
  the 
  north 
  end 
  of 
  the 
  wedge 
  and 
  apparently 
  on 
  the 
  

  

  