﻿REPORT 
  OF 
  TBE 
  DIRECTOR 
  r25 
  

  

  derive 
  their 
  names 
  from 
  localities 
  in 
  this 
  country, 
  namely 
  the 
  

   Georgian 
  (Walcott 
  'tU 
  p. 
  278-27"') 
  and 
  the 
  Etcheminian 
  and 
  St 
  John 
  

   group 
  (Matthew 
  '92 
  and 
  '95). 
  

  

  The 
  desired 
  section 
  for 
  description, 
  embracing 
  all 
  the 
  zones 
  

   developed 
  in 
  the 
  Trenton 
  Falls 
  province 
  was 
  not 
  found 
  in 
  the 
  few 
  

   weeks 
  spent 
  in 
  the 
  iii3ld 
  last 
  summer. 
  The 
  writer 
  is 
  convinced 
  

   however 
  that 
  it 
  will 
  be 
  found 
  by 
  further 
  search. 
  

  

  The 
  present 
  paper 
  however 
  adds 
  several 
  details 
  on 
  the 
  border 
  of 
  

   tlie 
  areas 
  occupied 
  by 
  the 
  formations, 
  as 
  depicted 
  on 
  the 
  state 
  economic 
  

   and 
  geologic 
  map 
  (Merrill 
  '95) 
  and 
  the 
  preliminary 
  geological 
  map 
  

   (Hall 
  '94:) 
  and 
  shows 
  that 
  the 
  border 
  of 
  the 
  crystalline 
  rock 
  extends 
  

   further 
  west 
  than 
  is 
  indicated 
  on 
  either 
  of 
  them. 
  

  

  . 
  The 
  area 
  covered 
  this 
  year 
  is 
  in 
  the 
  vicinity 
  of 
  Frankfort 
  Hill, 
  

   Herkimer 
  county, 
  and 
  from 
  Rathbone, 
  near 
  Kewport, 
  to 
  Lyon 
  

   Falls, 
  Lewis 
  county, 
  in 
  detailed 
  field 
  work, 
  and 
  thence 
  on 
  to 
  Car- 
  

   thage 
  in 
  hasty 
  inspection. 
  This 
  may 
  be 
  de 
  lined 
  as 
  a 
  portion 
  of 
  the 
  

   West 
  Canada 
  creek 
  and 
  Black 
  river 
  valley. 
  

  

  The 
  formations 
  enumerated 
  are 
  from 
  the 
  crystallines 
  through 
  

   most 
  of 
  the 
  Clinton 
  stage 
  as 
  there 
  developed.^ 
  

  

  CRYSTALLINli: 
  ROCKS 
  

  

  The 
  crystalline 
  rocks 
  are 
  similar 
  in 
  character 
  to 
  those 
  of 
  the 
  east- 
  

   ern 
  side 
  of 
  the 
  Archaean 
  Adirondack 
  island. 
  Along 
  all 
  the 
  tribu- 
  

   taries 
  of 
  West 
  Canada 
  creek 
  Archaean 
  appears 
  in 
  isolated 
  out- 
  

   crops, 
  at 
  some 
  distance 
  up-stream 
  from 
  the 
  nearest 
  paleozoic 
  out- 
  

   crop, 
  which 
  is 
  last 
  met 
  with 
  at 
  Hinckley. 
  From 
  Hinckley 
  the 
  

   southern 
  tributarj^ 
  (Black 
  creek) 
  meanders 
  through 
  black 
  silt 
  and 
  

   sand 
  until 
  Mount 
  creek 
  is 
  passed 
  (Locality 
  134). 
  The 
  rock 
  here 
  

  

  a 
  The 
  system 
  employed 
  in 
  recording 
  field 
  notes 
  was 
  that 
  developed 
  by 
  Prof. 
  Henry 
  S. 
  

   Williams, 
  during 
  his 
  study 
  of 
  the 
  Devonian 
  formations 
  of 
  central 
  New 
  York. 
  The 
  town 
  which 
  

   is 
  the 
  temporary 
  headquarters 
  for 
  field 
  work 
  of 
  the 
  vicinity 
  is 
  assigned 
  a 
  definite 
  number 
  as 
  

   130=Trenton 
  Falls. 
  During 
  the 
  progress 
  of 
  the 
  work 
  in 
  that 
  vicinity 
  every 
  exposure 
  or 
  con 
  

   tinuous 
  section 
  is 
  as-sigaed 
  a 
  letter 
  of 
  the 
  alphabet, 
  whether 
  the 
  section 
  be 
  along 
  a 
  shore, 
  in 
  

   the 
  bed 
  of 
  a 
  stream, 
  a 
  railroad 
  cutting 
  or 
  a 
  quarry. 
  In 
  the 
  case 
  of 
  sedimentary 
  rocks, 
  the 
  

   geologically 
  lowest 
  layer 
  in 
  that 
  section 
  is 
  sought 
  and 
  numbered 
  1 
  ; 
  each 
  superjacent 
  dis- 
  

   tinct 
  layer 
  being 
  numbered 
  in 
  series, 
  and 
  measured, 
  and 
  a 
  quantity 
  of 
  representative 
  

   material 
  coUictfd 
  from 
  each, 
  as 
  described 
  in 
  the 
  case 
  of 
  similar 
  work 
  by 
  the 
  writer 
  

   (White 
  '96). 
  

  

  The 
  field 
  numbers 
  have 
  been 
  retained 
  in 
  the 
  left-hand 
  margin 
  of 
  the 
  sections 
  described 
  in 
  

   the 
  present 
  paper, 
  although 
  in 
  some 
  cases 
  several 
  layers 
  distinguished 
  in 
  the 
  field 
  have 
  been 
  

   combined, 
  as 
  will 
  be 
  seen, 
  where 
  subsequent 
  laboratory 
  study 
  failed 
  to 
  detect 
  sufficient 
  dis- 
  

   tinction 
  between 
  them 
  to 
  warrant 
  their 
  separation. 
  

  

  