﻿44 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  Saratoga. 
  Beneath 
  this 
  was 
  180 
  feet 
  of 
  darker 
  colored 
  dolomite 
  

   of 
  varying 
  grain, 
  the 
  upper 
  and 
  lower 
  portions 
  through 
  a 
  thickness 
  

   of 
  some 
  50 
  feet 
  each 
  coarser 
  than 
  the 
  center. 
  The 
  upper 
  part 
  had 
  

   many 
  nodules 
  of 
  crystalline 
  calcite. 
  Underneath 
  this 
  was 
  a 
  recur- 
  

   rence 
  of 
  coarse, 
  light 
  colored 
  beds. 
  This 
  gave 
  rise 
  to 
  the 
  suspicion 
  

   that 
  perhaps 
  a 
  fault 
  was 
  crossed 
  here 
  causing 
  a 
  reappearance 
  of 
  

   the 
  upper 
  beds 
  of 
  the 
  formation. 
  But 
  no 
  suggestion 
  of 
  a 
  fault 
  was 
  

   given 
  in 
  the 
  appearance 
  of 
  the 
  drill 
  core, 
  and 
  a 
  careful 
  comparison 
  

   of 
  this 
  portion 
  with 
  the 
  upper 
  portion 
  did 
  not 
  show 
  any 
  exact 
  corre- 
  

   spondence. 
  There 
  was 
  also 
  a 
  greater 
  thickness 
  of 
  the 
  coarse 
  beds 
  

   here 
  than 
  above. 
  Below, 
  dark 
  beds 
  came 
  in 
  again 
  and 
  the 
  well 
  

   terminated 
  in 
  these. 
  If 
  this 
  section 
  is 
  really 
  unbroken, 
  then 
  the 
  

   thickness 
  of 
  the 
  formation 
  is 
  certainly 
  300 
  feet 
  and 
  may 
  be 
  con- 
  

   siderably 
  more. 
  

  

  The 
  Hathorn 
  well 
  was 
  1006 
  feet 
  deep. 
  After 
  62 
  feet 
  of 
  drift 
  

   the 
  drill 
  entered 
  the 
  Amsterdam 
  limestone. 
  The 
  bottom 
  231 
  feet 
  

   were 
  reported 
  as 
  Potsdam, 
  but 
  the 
  thickness 
  suggests 
  that 
  the 
  

   Theresa 
  is 
  also 
  included 
  and 
  perhaps 
  the 
  basal 
  Hoyt. 
  Assuming 
  it 
  

   to 
  represent 
  Potsdam 
  and 
  Theresa, 
  and 
  deducting 
  this 
  thickness 
  and 
  

   the 
  drift 
  thickness 
  from 
  the 
  total 
  of 
  the 
  well, 
  leaves 
  yet 
  a 
  thickness 
  

   of 
  over 
  700 
  feet 
  for 
  the 
  combined 
  Amsterdam, 
  Little 
  Falls 
  and 
  

   Hoyt 
  formations. 
  If 
  the 
  bore 
  does 
  not 
  cross 
  a 
  fault 
  this 
  would 
  

   mean 
  a 
  thickness 
  of 
  from 
  500 
  to 
  550 
  feet 
  for 
  the 
  Little 
  Falls 
  which 
  

   is 
  considerably 
  in 
  excess 
  of 
  any 
  known 
  thickness 
  elsewhere 
  pos- 
  

   sessed 
  by 
  the 
  formation. 
  It 
  is 
  doubtful 
  if 
  it 
  exceeds 
  350 
  feet 
  in 
  

   the 
  Saratoga 
  region, 
  though 
  it 
  may 
  reach 
  400, 
  which 
  is 
  as 
  great 
  

   a 
  thickness 
  as 
  it 
  is 
  known 
  to 
  reach 
  at 
  any 
  point. 
  

  

  There 
  is 
  much 
  chert 
  in 
  the 
  formation. 
  Black 
  chert 
  is 
  the 
  most 
  

   abundant 
  but 
  gray 
  chert 
  is 
  by 
  no 
  means 
  uncommon. 
  The 
  upper 
  

   beds 
  of 
  the 
  formation 
  are 
  heavily 
  charged 
  with 
  chert 
  in 
  nearly 
  all 
  

   localities 
  throughout 
  its 
  extent, 
  and 
  Saratoga 
  is 
  no 
  exception 
  to 
  

   the 
  general 
  rule. 
  The 
  upper 
  bed 
  at 
  the 
  Maple 
  Avenue 
  quarry 
  is 
  

   full 
  of 
  chert. 
  The 
  lower 
  beds 
  of 
  the 
  formation 
  are 
  also 
  heavily 
  

   charged 
  with 
  it. 
  These 
  beds 
  are 
  best 
  seen 
  about 
  a 
  mile 
  south 
  of 
  

   Porter 
  Corners. 
  

  

  The 
  formation 
  is 
  everywhere 
  exceedingly 
  unfossilif 
  erous. 
  L 
  i 
  n 
  - 
  

   gulella 
  acuminata 
  is 
  occasionally 
  found 
  in 
  the 
  lower 
  beds, 
  

   and 
  a 
  few 
  fossils 
  are 
  sometimes 
  to 
  be 
  seen 
  in 
  the 
  upper 
  cherts. 
  The 
  

   most 
  common 
  fossil, 
  however, 
  is 
  Cryptozoon, 
  reefs 
  of 
  which 
  occur 
  

   throughout 
  the 
  formation. 
  This 
  is 
  the 
  only 
  fossil 
  which 
  we 
  have 
  

   seen 
  in 
  the 
  formation 
  about 
  Saratoga. 
  In 
  most 
  of 
  the 
  formation 
  the 
  

  

  