﻿32 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  similar 
  results. 
  1 
  Contacts 
  are 
  few 
  on 
  the 
  Saratoga 
  quadrangle, 
  but 
  

   to 
  the 
  north 
  of 
  the 
  village 
  the 
  basal 
  Potsdam 
  conditions 
  are 
  well 
  

   shown 
  for 
  a 
  distance 
  of 
  4 
  miles 
  along 
  the 
  Potsdam 
  margin 
  ; 
  and 
  for 
  

   a 
  mile 
  along 
  the 
  Hudson 
  just 
  below 
  Corinth 
  exposures 
  of 
  this 
  

   horizon 
  are 
  excellent. 
  The 
  Precambric 
  surface 
  on 
  which 
  the 
  Pots- 
  

   dam 
  rests 
  is 
  irregular. 
  The 
  more 
  resistant 
  bands 
  of 
  the 
  Grenville 
  

   and 
  the 
  .igneous 
  rocks 
  stand 
  above 
  the 
  mean 
  level, 
  as 
  hillocks 
  or 
  

   ridges, 
  while 
  the 
  weaker 
  rocks 
  are 
  worn 
  away 
  to 
  valleys 
  or 
  basins 
  

   below 
  mean 
  level. 
  Potsdam 
  deposition 
  began 
  in 
  the 
  depressions, 
  

   and 
  as 
  the 
  sand 
  accumulated 
  it 
  finally 
  overtopped 
  the 
  elevations. 
  

   There 
  are 
  differences 
  of 
  level 
  of 
  at 
  least 
  75 
  feet, 
  and 
  probably 
  more. 
  

   Assuming 
  that 
  the 
  -conditions 
  of 
  this 
  surface 
  on 
  the 
  northwest 
  

   and 
  the 
  southeast 
  (Thousand 
  Islands 
  and 
  Saratoga 
  regions) 
  are 
  

   substantially 
  the 
  same, 
  as 
  the 
  evidence 
  indicates, 
  and 
  that 
  the 
  sur- 
  

   face 
  on 
  the 
  southwest 
  (Little 
  Falls-Remsen) 
  is 
  much 
  smoother, 
  it 
  

   would 
  seem 
  probable 
  that 
  in 
  the 
  opposite 
  direction, 
  on 
  the 
  north- 
  

   east, 
  it 
  should 
  be 
  rougher. 
  In 
  that 
  direction 
  we 
  lack 
  the 
  detailed 
  

   work 
  which 
  might 
  render 
  the 
  matter 
  certain 
  and 
  can 
  merely 
  state 
  

   that 
  the 
  impression 
  given 
  us 
  by 
  our 
  reconnaissance 
  work 
  on 
  the 
  

   northeast 
  is 
  that 
  it 
  is 
  rougher. 
  We 
  have 
  seen 
  Precambric 
  hills 
  

   which 
  project 
  up 
  into 
  the 
  Potsdam 
  to 
  the 
  distance 
  of 
  200 
  feet. 
  

   From 
  the 
  data 
  at 
  hand 
  we 
  therefore 
  conclude 
  that 
  the 
  Precambric 
  

   surface 
  under 
  the 
  Potsdam 
  is 
  least 
  smooth 
  on 
  the 
  northeast 
  

   (Clinton 
  county), 
  and 
  that 
  it 
  steadily 
  increases 
  in 
  smoothness 
  

   toward 
  the 
  southwest. 
  The 
  northwest 
  and 
  the 
  southeast 
  are 
  about 
  

   equidistant 
  from 
  these 
  and 
  should 
  be 
  expected 
  to 
  show 
  about 
  equal 
  

   character 
  of 
  surface, 
  as 
  they 
  do. 
  

  

  CAMBRIC 
  PERIOD 
  

  

  General 
  statement. 
  The 
  formations 
  of 
  Cambric 
  age 
  belonging 
  

   to 
  the 
  western 
  basin 
  and 
  found 
  within 
  the 
  mapped 
  district, 
  are 
  the 
  

   Potsdam, 
  Theresa 
  and 
  Little 
  Falls 
  formations, 
  the 
  Potsdam 
  a 
  sand- 
  

   stone, 
  the 
  Theresa 
  a 
  series 
  of 
  passage 
  beds 
  of 
  alternating 
  sand- 
  

   stone 
  and 
  limestone 
  or 
  dolomite, 
  and 
  the 
  Little 
  Falls 
  a 
  dolomite 
  

   formation. 
  Between 
  the 
  Theresa 
  and 
  Little 
  Falls 
  in 
  the 
  near 
  

   vicinity 
  of 
  Saratoga 
  is 
  a 
  more 
  calcareous 
  formation 
  which 
  we 
  call 
  

   the 
  Hoyt 
  limestone, 
  which 
  is 
  probably 
  best 
  regarded 
  as 
  an 
  upper 
  

   member 
  of 
  the 
  Theresa 
  formation. 
  

  

  According 
  to 
  prevailing 
  present-day 
  classification, 
  these 
  forma- 
  

   tions 
  are 
  of 
  Upper 
  Cambric 
  age. 
  They 
  also 
  belong 
  in 
  the 
  new 
  

   system, 
  Ozarkic, 
  which 
  Ulrich 
  is 
  proposing 
  to 
  establish 
  between 
  

  

  1 
  N. 
  Y. 
  State 
  Mus. 
  Bui. 
  153, 
  p. 
  50-52. 
  

  

  

  