﻿674 
  FORTI-SEVENTH 
  REPORT 
  ON 
  THE 
  S'TATE 
  MUSEUM. 
  

  

  in 
  any 
  exposures, 
  and 
  there 
  is 
  a 
  certain 
  amount 
  of 
  evidence 
  to 
  

   show 
  that 
  this 
  non-appearance 
  is 
  due 
  to 
  a 
  fault. 
  In 
  southern 
  

   Cbamp'ain, 
  and 
  throughout 
  most 
  of 
  Chazy 
  township, 
  the 
  Calcif- 
  

   erous 
  does 
  not 
  appear 
  and 
  the 
  Potsdam 
  and 
  Chazy 
  limestone 
  lie 
  

   close 
  together, 
  though 
  absolute 
  contact 
  is 
  nowhere 
  shown. 
  

   This 
  condition 
  continues 
  for 
  a 
  distance 
  of 
  nearly 
  nine 
  miles, 
  

   from 
  Coopersville 
  in 
  Champlain 
  township 
  to 
  a 
  point 
  one 
  and 
  one- 
  

   half 
  miles 
  north 
  of 
  West 
  Chazy 
  in 
  the 
  southwestern 
  corner 
  of 
  

   Chazy 
  township. 
  At 
  several 
  points 
  along 
  this 
  line, 
  however, 
  

   rem 
  iants 
  of 
  slightly 
  calcareous, 
  dark-colored 
  sandstones 
  are 
  seen 
  

   in 
  direct 
  contact 
  with 
  the 
  Potsdam, 
  though 
  no 
  contact 
  with 
  the 
  

   Chazy 
  has 
  been 
  observed. 
  These 
  are 
  clearly 
  continuous 
  with 
  

   the 
  passage 
  beds 
  between 
  the 
  Potsdam 
  and 
  Calciferous 
  in 
  north- 
  

   ern 
  and 
  central 
  Champlain, 
  and 
  show 
  that 
  we 
  have 
  here 
  the 
  

   summit 
  beds 
  of 
  the 
  Pot 
  dam. 
  In 
  Plattsburgh 
  township 
  the 
  Cal- 
  

   ciferous 
  is 
  almost 
  wholly 
  covered 
  by 
  drift, 
  and 
  this 
  is 
  true 
  to 
  a 
  

   considerable 
  extent 
  also 
  in 
  Beekmantown 
  In 
  the 
  latter 
  a 
  

   considerable 
  thickness 
  of 
  Calciferous 
  is 
  exposed, 
  but 
  the 
  upper 
  

   and 
  lower 
  limits 
  are 
  nowhere 
  shown, 
  and 
  it 
  seems 
  certain 
  that 
  

   only 
  a 
  comparatively 
  small 
  part 
  of 
  the 
  entire 
  thickness 
  of 
  the 
  

   formation 
  is 
  shown. 
  It 
  would 
  also 
  seem 
  that 
  it 
  is 
  higher 
  than 
  

   the 
  Calciferous 
  in 
  Champlain 
  township. 
  In 
  Peru 
  township 
  the 
  

   Calciferous 
  again 
  appears 
  in 
  considerable 
  force, 
  but 
  no 
  data 
  for 
  

   determining 
  its 
  thickness 
  were 
  disclosed 
  by 
  last 
  season's 
  work. 
  

   Commencing 
  in 
  southern 
  Chazy, 
  and 
  extending 
  thence 
  in 
  a 
  belt 
  

   through 
  Beekmantown 
  and 
  Plattsburgh 
  township, 
  a 
  series 
  of 
  

   unfossiliferous, 
  somewhat 
  sandy 
  dolomites 
  is 
  exposed, 
  overlying 
  

   tbv 
  undoubted 
  Calciferous, 
  carrying 
  Oj)hileta, 
  in 
  Beekmantown, 
  

   or 
  at 
  least 
  lying 
  east 
  of 
  it. 
  This 
  resembles 
  it 
  lithologically, 
  and 
  

   would 
  be 
  unhesitatingly 
  classed 
  as 
  Calciferous 
  were 
  it 
  not 
  that 
  

   certain 
  features 
  of 
  the 
  stratigraphy 
  seem 
  to 
  indicate 
  a 
  Chazy 
  

   age. 
  The 
  typical 
  fossiliferous 
  rocks 
  of 
  the 
  three 
  divisions 
  

   of 
  the 
  Chazy 
  are 
  nowhere 
  exposed 
  in 
  Beekmantown, 
  with 
  

   a 
  single 
  possible 
  exception, 
  though 
  widely 
  exposed 
  in 
  Chazy 
  

   on 
  the 
  north 
  and 
  in 
  Plattsburgh 
  on 
  the 
  south. 
  As 
  the 
  Chazy 
  

   rocks 
  are 
  followed 
  south 
  through 
  Chazy 
  township 
  they 
  disappear 
  

   entirely 
  and 
  in 
  their 
  stead 
  these 
  unfossiliferous 
  beds 
  appear, 
  

   where 
  any 
  exposures 
  are 
  found. 
  They 
  continue 
  south 
  through 
  

   Beekmantown 
  to 
  the 
  Plattt 
  burgh 
  line, 
  where 
  they 
  apparently 
  are 
  

  

  