﻿GEOLOGY 
  OF 
  THOUSAND 
  ISLANDS 
  REGION 
  "Jj 
  

  

  formation, 
  and 
  much 
  complicates 
  the 
  successful 
  working 
  out 
  of 
  the 
  

   section. 
  

  

  Extent 
  of 
  the 
  Pamelia 
  formation. 
  In 
  a 
  preliminary 
  paper 
  pub- 
  

   lished 
  some 
  months 
  ago, 
  based 
  on 
  the 
  field 
  work 
  up 
  to 
  the 
  close 
  of 
  

   1907, 
  the 
  writer 
  attempted 
  to 
  predict 
  the 
  extent 
  of 
  the 
  Pamelia 
  

   formation 
  in 
  New 
  York 
  and 
  adjacent 
  Ontario, 
  in 
  so 
  far 
  as 
  the 
  

   published 
  literature 
  warranted. 
  The 
  result 
  of 
  the 
  field 
  work 
  of 
  

   1908 
  necessitates 
  some 
  modification 
  of 
  the 
  statements 
  there 
  made, 
  

   all 
  of 
  which 
  prove 
  to 
  have 
  been 
  too 
  moderate.^ 
  

  

  The 
  study 
  of 
  the 
  formation 
  on 
  the 
  Clayton 
  sheet, 
  and 
  the 
  work 
  

   about 
  Kingston, 
  show 
  that 
  the 
  formation 
  does 
  not 
  thin 
  as 
  rapidly 
  

   in 
  those 
  directions 
  as 
  had 
  been 
  supposed. 
  About 
  Kingston 
  the 
  

   formation 
  has 
  much 
  prominence 
  and 
  considerable 
  thickness, 
  much 
  

   of 
  the 
  upper 
  division, 
  and 
  the 
  basal 
  sandstones 
  being 
  well 
  repre- 
  

   sented. 
  The 
  upper 
  dove 
  limestones 
  of 
  the 
  New 
  York 
  section 
  are 
  

   here 
  capped 
  by 
  thin 
  bedded, 
  earthy, 
  shaly 
  layers, 
  weathering 
  yel- 
  

   low, 
  above 
  which 
  the 
  Lowville 
  comes 
  in, 
  with 
  its 
  basal 
  conglom- 
  

   erate. 
  The 
  division 
  plane 
  between 
  the 
  two 
  formations 
  is 
  therefore 
  

   much 
  easier 
  of 
  recognition 
  than 
  on 
  the 
  New 
  York 
  side. 
  

  

  Up 
  the 
  Black 
  river 
  valley 
  we 
  measured 
  sections 
  at 
  Lowville 
  and 
  

   on 
  Roaring 
  creek, 
  near 
  Martinsburg, 
  the 
  latter 
  a 
  wonderfully 
  fine, 
  

   continuous 
  section 
  from 
  the 
  Precambric 
  up 
  into 
  the 
  Trenton. 
  We 
  

   were 
  at 
  the 
  time 
  ignorant 
  of 
  the 
  fact 
  that 
  Prof. 
  W. 
  J. 
  Miller 
  was 
  

   engaged 
  in 
  the 
  areal 
  mapping 
  of 
  the 
  Port 
  Leyden 
  sheet, 
  on 
  which 
  

   this 
  section 
  occurs. 
  That 
  being 
  the 
  case 
  its 
  detailed 
  exposition 
  is 
  

   left 
  for 
  him.- 
  Suffice 
  it 
  to 
  state 
  that 
  it 
  shows 
  a 
  thickness 
  of 
  "J^ 
  

   feet, 
  6 
  inches 
  of 
  Pamelia, 
  overlaid 
  by 
  54 
  feet, 
  7 
  inches 
  of 
  Lowville 
  ; 
  

   and 
  that, 
  of 
  the 
  Pamelia, 
  the 
  lower 
  19 
  feet 
  is 
  of 
  sandy 
  beds, 
  fol- 
  

   lowed 
  by 
  8 
  feet 
  of 
  blackish 
  limestone 
  with 
  abundant 
  marine 
  fossils, 
  

   the 
  remainder 
  showing 
  alternating 
  beds 
  with 
  the 
  characters 
  of 
  the 
  

   upper 
  division 
  though 
  the 
  upper 
  dove 
  beds 
  are 
  lacking. 
  Miller 
  

   reports 
  that 
  the 
  formation 
  is 
  traceable 
  to 
  the 
  south 
  line 
  of 
  the 
  Port 
  

   Leyden 
  sheet, 
  but 
  does 
  not 
  appear 
  beyond. 
  This 
  is, 
  however, 
  well 
  

   toward 
  the 
  upper 
  end 
  of 
  the 
  Black 
  river 
  valley, 
  and 
  gives 
  the 
  

   formation 
  in 
  New 
  York 
  a 
  measured 
  length 
  of 
  outcrop 
  of 
  70 
  miles, 
  

   from 
  southeast 
  to 
  northwest. 
  The 
  Kingston 
  occurrence 
  adds 
  15 
  

   miles 
  more 
  to 
  this 
  distance, 
  and 
  it 
  is 
  quite 
  probable 
  that 
  the 
  forma- 
  

   tion 
  may 
  run 
  west 
  for 
  some 
  miles 
  across 
  the 
  Ontarian 
  peninsula. 
  

  

  Our 
  work 
  was 
  done, 
  and 
  a 
  preliminary 
  paper 
  published, 
  while 
  in 
  

   ignorance 
  of 
  the 
  existence 
  of 
  a 
  paper 
  by 
  Dr 
  Ells 
  upon 
  the 
  adjacent 
  

   Canadian 
  district. 
  This 
  paper, 
  as 
  the 
  quotation 
  which 
  follows 
  will 
  

  

  1 
  Geol. 
  Soc. 
  Am. 
  Bui. 
  19:165-71. 
  

  

  2 
  N. 
  Y. 
  State 
  Mus. 
  Bui. 
  135, 
  p. 
  22, 
  ^z. 
  

  

  