﻿Preliminary 
  Report 
  on 
  the 
  Geology 
  of 
  Clinton 
  

  

  County, 
  N. 
  Y. 
  

  

  By 
  H. 
  P. 
  CUSHING 
  

  

  James 
  Hall, 
  State 
  Geologist 
  : 
  

  

  Sir. 
  — 
  In 
  1893 
  a 
  beginning 
  was 
  made 
  in 
  the 
  work 
  of 
  investi- 
  

   gating 
  and 
  mapping 
  the 
  geology 
  of 
  Clinton 
  county. 
  The 
  work 
  

   done 
  was 
  confined 
  to 
  the 
  eastern 
  ha 
  ! 
  f 
  of 
  the 
  county, 
  bordering 
  

   on 
  Lake 
  Champlain,- 
  and 
  the 
  brief 
  time 
  available 
  for 
  work 
  was 
  

   devoted 
  to 
  a 
  rapid 
  and 
  general 
  survey 
  of 
  the 
  area 
  ; 
  detailed 
  

   mapping 
  on 
  a 
  large 
  scale, 
  which 
  will 
  be 
  necessary 
  in 
  order 
  to 
  

   accurately 
  map 
  the 
  subdivisions 
  of 
  formations 
  and 
  minor 
  struc- 
  

   tural 
  features, 
  being 
  left 
  for 
  the 
  future. 
  Over 
  a 
  considerable 
  

   part 
  of 
  the 
  region 
  covered, 
  outcrops 
  occur 
  only 
  rarely 
  or 
  else 
  are 
  

   entirely 
  absent. 
  The 
  structure 
  is 
  also 
  complicated 
  by 
  numerous 
  

   faults, 
  which 
  are 
  frequently 
  difficult 
  to 
  locate 
  from 
  lack 
  of 
  out- 
  

   crops 
  in 
  sufficient 
  number. 
  The 
  results 
  presented 
  are, 
  therefore, 
  

   merely 
  tentative. 
  It 
  is 
  believed, 
  however, 
  that 
  the 
  boundaries 
  

   between 
  the 
  pre-Cambrian 
  and 
  Cambrian, 
  between 
  the 
  Cambrian 
  

   and 
  the 
  succeeding 
  limestones 
  (Calciferous 
  — 
  Chazy 
  — 
  Trenton), 
  

   and 
  between 
  these 
  and 
  the 
  Hudson 
  Eiver 
  rocks 
  are 
  accurately 
  

   presented, 
  except 
  where 
  they 
  can 
  not 
  be 
  precisely 
  located, 
  on 
  

   account 
  of 
  widespread 
  occurrence 
  of 
  soil 
  and 
  drift. 
  The 
  tentative 
  

   matters 
  concern 
  in 
  the 
  main 
  the 
  differentiation 
  of 
  the 
  subor- 
  

   dinate 
  members 
  of 
  the 
  limestone 
  series 
  (Calciferous 
  — 
  Chazy 
  — 
  

   Trenton) 
  from 
  one 
  another, 
  and 
  their 
  delineation 
  on 
  the 
  map. 
  

   To 
  a 
  considerable 
  extent 
  these 
  are 
  also 
  accurately 
  located. 
  

   Elsewhere 
  much 
  doubt 
  prevails, 
  but 
  it 
  was 
  believed 
  wise 
  to 
  

   have 
  the 
  map 
  represent 
  the 
  present 
  state 
  of 
  our 
  knowledge 
  . 
  

  

  So 
  far 
  as 
  known 
  the 
  rock 
  terraces 
  underlying 
  this 
  county 
  

   comprise 
  : 
  

  

  1st, 
  a 
  series 
  of 
  gneisses, 
  more 
  commonly 
  flesh 
  colored 
  and 
  

   rather 
  acidic, 
  frequently, 
  however, 
  black 
  and 
  basic, 
  rarely 
  quite 
  

   schistose 
  in 
  structure, 
  and 
  of 
  pre-Cambrian 
  age 
  ; 
  

  

  