﻿46 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  region 
  has 
  not 
  yet 
  been 
  published, 
  but 
  it 
  is 
  hoped 
  that 
  it 
  will 
  soon 
  

   appear. 
  A 
  preliminary 
  statement 
  concerning 
  it 
  has 
  already 
  been 
  

   made. 
  1 
  

  

  Within 
  the 
  Saratoga 
  quadrangle 
  this 
  limestone 
  is 
  seldom 
  exposed, 
  

   owing 
  to 
  heavy 
  covering 
  of 
  glacial 
  drift. 
  The 
  best 
  and 
  most 
  com- 
  

   plete 
  section 
  of 
  it 
  is 
  at 
  Rock 
  City 
  Falls, 
  where 
  the 
  contact 
  with 
  the 
  

   nnderlying 
  Little 
  Falls 
  dolomite 
  is 
  exposed. 
  At 
  Saratoga 
  the 
  base 
  

   is 
  thinly 
  exposed 
  and 
  a 
  wedge 
  of 
  the 
  formation 
  is 
  infaulted 
  along 
  

   the 
  Saratoga 
  fault, 
  exposed 
  back 
  of 
  the 
  Star 
  spring 
  and 
  for 
  a 
  short 
  

   distance 
  northward. 
  There 
  is 
  a 
  good 
  exposure 
  at 
  Rowlands 
  mill, 
  

   which, 
  however, 
  does 
  not 
  show 
  the 
  base; 
  and 
  there 
  are 
  other 
  

   exposures 
  through 
  North 
  Milton, 
  the 
  best 
  folded 
  into 
  a 
  little 
  syn- 
  

   cline. 
  There 
  is 
  also 
  a 
  small 
  exposure 
  of 
  basal 
  Amsterdam 
  and 
  

   summit 
  Little 
  Falls, 
  drop-faulted 
  along 
  the 
  West 
  Galway 
  fault, 
  

   south 
  of 
  East 
  Galway. 
  Nowhere 
  within 
  the 
  quadrangle 
  has 
  the 
  

   summit 
  been 
  seen 
  exposed, 
  except 
  perhaps 
  at 
  Rowlands 
  mill. 
  

  

  The 
  best 
  section 
  and 
  the 
  one 
  exposing 
  the 
  lowest 
  beds, 
  is 
  that 
  

   at 
  Rock 
  City 
  Falls 
  (plate 
  11). 
  The 
  section 
  here 
  had 
  been 
  pre- 
  

   viously 
  measured 
  by 
  Prosser. 
  2 
  There 
  is 
  some 
  14 
  feet 
  of 
  Little 
  Falls 
  

   dolomite 
  in 
  the 
  face 
  of 
  the 
  fall, 
  gray, 
  finely 
  crystalline 
  dolomite 
  for 
  

   the 
  most 
  part, 
  full 
  of 
  black 
  seams, 
  occasional 
  nodules 
  of 
  crystalline 
  

   calcite, 
  and 
  with 
  much 
  chert 
  midway. 
  The 
  horizon 
  seems 
  beneath 
  

   that 
  of 
  the 
  coarser, 
  light 
  colored 
  beds, 
  such 
  as 
  form 
  the 
  summit 
  

   about 
  Saratoga, 
  and 
  they 
  have 
  likely 
  been 
  removed 
  by 
  erosion. 
  The 
  

   contact 
  shows 
  slight 
  irregularity, 
  as 
  it 
  does 
  at 
  Saratoga. 
  The 
  lower 
  

   3 
  feet 
  of 
  the 
  overlying 
  beds 
  have 
  a 
  look 
  of 
  the 
  Lowville 
  and 
  were 
  

   referred 
  to 
  that 
  formation 
  by 
  Prosser. 
  We 
  collected 
  some 
  fossils 
  

   from 
  them, 
  however, 
  which 
  seemed 
  to 
  belong 
  to 
  the 
  Amsterdam, 
  

   though 
  we 
  are 
  somewhat 
  in 
  doubt 
  in 
  the 
  matter. 
  If 
  this 
  be 
  Lowville 
  

   it 
  is 
  the 
  only 
  occurrence 
  of 
  this 
  formation 
  seen 
  within 
  the 
  quad- 
  

   rangle 
  limits. 
  Above 
  follow 
  38 
  feet 
  of 
  Amsterdam, 
  somewhat 
  thin- 
  

   bedded, 
  crystalline 
  fossiliferous 
  limestone 
  of 
  blue 
  color. 
  Not 
  only 
  

   are 
  the 
  Lowville-looking 
  beds 
  absent 
  elsewhere 
  but 
  the 
  succeeding 
  

   15 
  feet 
  is 
  also 
  absent 
  in 
  the 
  North 
  Milton 
  sections, 
  the 
  higher 
  beds 
  

   resting 
  directly 
  on 
  the 
  Little 
  Falls 
  there. 
  At 
  Rowlands 
  mill 
  and 
  

   in 
  the 
  North 
  Milton 
  sections 
  the 
  summit 
  shown 
  is 
  thinner 
  bedded 
  

   and 
  likely 
  above 
  anything 
  in 
  the 
  Rock 
  City 
  Falls 
  section. 
  About 
  

   North 
  Milton 
  are 
  a 
  half 
  dozen 
  exposures, 
  chiefly 
  pinched 
  into 
  a 
  

   little 
  syncline 
  with 
  the 
  upper 
  Little 
  Falls, 
  as 
  shown 
  on 
  the 
  areal 
  

   map. 
  

  

  1 
  Am. 
  Jour. 
  Sci., 
  31:143. 
  

  

  2 
  N. 
  Y. 
  State 
  Mus. 
  Bui. 
  34, 
  p. 
  476. 
  

  

  