﻿334 
  PROCEEDINGS 
  OF 
  THE 
  GEOLOGICAL 
  SOCIETY. 
  [^P 
  r 
  « 
  27, 
  

  

  was 
  confirmed 
  by 
  my 
  examination 
  of 
  new 
  localities, 
  in 
  one 
  of 
  which 
  

   occurred 
  Upper 
  Ludlow 
  and 
  Lower 
  Helderberg 
  and 
  Clinton 
  strata, 
  

   without 
  the 
  intermediate 
  formation 
  ; 
  in 
  another 
  occurred 
  Upper 
  

   Arisaig 
  beds, 
  and 
  strata 
  which 
  had 
  not 
  been 
  found 
  in 
  any 
  of 
  the 
  

   other 
  localities, 
  but 
  which 
  I 
  considered 
  as 
  possibly 
  also 
  of 
  Wenlock 
  

   age. 
  In 
  a 
  paper 
  on 
  these 
  new 
  localities, 
  read 
  in 
  1860 
  before 
  the 
  

   Natural 
  History 
  Society 
  of 
  Montreal, 
  this 
  opinion 
  was 
  expressed 
  by 
  

   me. 
  Dr. 
  Dawson 
  suggested 
  that 
  the 
  new 
  fossils 
  were 
  possibly 
  

   Devonian*. 
  In 
  the 
  same 
  paper 
  I 
  announced 
  the 
  discovery 
  of 
  fossils 
  

   in 
  a 
  part 
  of 
  the 
  Arisaig 
  series 
  which 
  was 
  before 
  considered 
  as 
  non- 
  

   fossiliferous, 
  and 
  in 
  a 
  position 
  considered 
  by 
  Dr. 
  Dawson 
  and 
  my- 
  

   self 
  as 
  lower 
  than 
  the 
  Clinton 
  group. 
  Still 
  later 
  I 
  discovered 
  at 
  

   Arisaig, 
  in 
  situ, 
  and 
  in 
  a 
  position 
  somewhat 
  perplexing, 
  fossils 
  

   similar 
  to 
  those 
  which 
  I 
  had 
  considered 
  as 
  doubtfully 
  Wenlock, 
  and 
  

   Dr. 
  Dawson 
  as 
  possibly 
  Devonian. 
  Another 
  perplexing 
  circum- 
  

   stance 
  was 
  stated 
  by 
  Dr. 
  Dawson, 
  in 
  the 
  note 
  referred 
  to, 
  namely, 
  that 
  

   my 
  newly 
  discovered 
  localities 
  tended 
  to 
  confirm 
  an 
  opinion 
  that 
  he 
  

   had 
  elsewhere 
  expressed, 
  to 
  the 
  effect 
  that 
  the 
  Silurian 
  and 
  Devonian 
  

   strata, 
  of 
  which 
  the 
  Arisaig 
  series 
  formed 
  a 
  part, 
  had 
  been 
  thrown 
  

   into 
  synclinal 
  and 
  anticlinal 
  folds 
  on 
  the 
  formation 
  of 
  the 
  meta- 
  

   morphic 
  mountain-ranges, 
  on 
  the 
  skirts 
  of 
  which 
  the 
  various 
  Silurian 
  

   and 
  Devonian 
  localities 
  are 
  situated. 
  Regarding 
  this 
  opinion 
  as 
  

   correct, 
  it 
  appeared 
  to 
  me 
  that 
  the 
  dip 
  of 
  the 
  Arisaig 
  series 
  was 
  in 
  

   the 
  wrong 
  direction, 
  and 
  diminished 
  in 
  proportion 
  as 
  it 
  receded 
  from 
  

   the 
  mountain-range, 
  with 
  the 
  possible 
  exception 
  of 
  the 
  last- 
  discovered 
  

   part 
  of 
  the 
  series. 
  Supposing 
  this 
  last 
  to 
  be 
  the 
  upper 
  bed, 
  as 
  

   it 
  must 
  be 
  if 
  its 
  equivalent 
  at 
  the 
  lately 
  discovered 
  locality, 
  Lochaber, 
  

   were 
  Devonian, 
  it 
  should 
  overlie 
  the 
  uppermost 
  instead 
  of 
  the 
  lowest 
  

   member 
  of 
  the 
  Silurian 
  series. 
  

  

  This 
  was 
  the 
  state 
  of 
  matters 
  relative 
  to 
  this 
  admirable 
  and 
  

   typical 
  section 
  in 
  our 
  Nova-Scotian 
  geology, 
  when 
  I 
  was 
  engaged 
  to 
  

   make 
  a 
  collection 
  of 
  the 
  rocks 
  and 
  fossils 
  of 
  our 
  province 
  for 
  the 
  

   International 
  Exhibition 
  of 
  1862. 
  Sir 
  Roderick 
  Murchison, 
  at 
  my 
  

   request, 
  very 
  kindly 
  asked 
  Mr. 
  Salter 
  to 
  examine 
  it, 
  who 
  accordingly 
  

   inspected 
  my 
  divisions 
  of 
  fossils, 
  and, 
  studiously 
  avoiding 
  all 
  inquiry 
  

   into 
  the 
  opinions 
  already 
  entertained, 
  he 
  unhesitatingly 
  referred 
  

   my 
  Upper 
  Ludlow 
  to 
  the 
  Ludlow 
  Tilestone, 
  my 
  Wenlock 
  (?) 
  to 
  the 
  

   Aymestry 
  Limestone, 
  and 
  Hall 
  and 
  Dawson's 
  Clinton 
  to 
  a 
  repetition 
  of 
  

   the 
  Ludlow 
  Tilestone. 
  He 
  could 
  not 
  decide 
  on 
  the 
  fossils 
  of 
  No. 
  5 
  (?). 
  

   With 
  regard 
  to 
  No. 
  4, 
  the 
  equivalents 
  of 
  which 
  had 
  been 
  regarded 
  

   by 
  Dr. 
  Dawson 
  as 
  possibly 
  Devonian, 
  and 
  by 
  myself 
  as 
  possibly 
  

   Wenlock, 
  Mr. 
  Salter 
  at 
  once 
  referred 
  them 
  to 
  the 
  Mayhiil 
  Sand- 
  

   stone 
  age, 
  qualifying 
  the 
  whole 
  with 
  " 
  approximately." 
  The 
  matter 
  

   was 
  thus, 
  to 
  me 
  at 
  least, 
  cleared 
  of 
  doubt, 
  except 
  on 
  one 
  point 
  

   where 
  a 
  difference 
  of 
  opinion 
  existed, 
  arising 
  chiefly, 
  as 
  it 
  appeared 
  

   to 
  me, 
  from 
  a 
  difference 
  of 
  opinion 
  regarding 
  the 
  Graptolite 
  already 
  

   referred 
  to, 
  — 
  Hall 
  considering 
  it 
  as 
  Graptaliihus 
  Clintonensis, 
  and 
  

   Salter 
  as 
  G. 
  Ludensis, 
  the 
  containing 
  strata 
  being 
  accordingly 
  con- 
  

   sidered 
  by 
  the 
  one 
  as 
  equivalent 
  to 
  the 
  Clinton 
  group, 
  and 
  by 
  the 
  

   * 
  See 
  paper 
  with 
  Dawson's 
  note, 
  Canad. 
  Nat. 
  and 
  Geol. 
  vol. 
  v. 
  pp. 
  293 
  et 
  seq. 
  

  

  