﻿400 
  PEOF. 
  J. 
  D. 
  DANA 
  ON 
  THE 
  GEOLOGICAL 
  

  

  satisfied 
  himself 
  so 
  far 
  as 
  to 
  the 
  Taconic 
  question, 
  that 
  on 
  his 
  Geo- 
  

   logical 
  Charts, 
  published 
  in 
  1863 
  and 
  1869, 
  he 
  made 
  the 
  schists 
  and 
  

   associated 
  rocks 
  Lower 
  Silurian, 
  and 
  of 
  the 
  " 
  Quebec 
  Group." 
  In 
  

   1864 
  he 
  made 
  an 
  examination 
  of 
  the 
  Taconic 
  and 
  adjoining 
  regions 
  

   in 
  company 
  with 
  Prof. 
  James 
  Hall*, 
  visiting 
  Berkshire 
  and 
  north- 
  

   western 
  Connecticut, 
  and 
  extending 
  his 
  observations 
  also 
  west 
  and 
  

   south-west 
  of 
  the 
  Taconic 
  range 
  to 
  the 
  Hudson 
  river. 
  The 
  schists 
  

   and 
  limestones 
  were 
  found 
  to 
  be 
  involved 
  together 
  in 
  common 
  folds, 
  

   Canaan 
  Mountain 
  and 
  Washington 
  Mountain 
  to 
  be 
  flanked 
  with 
  

   limestone, 
  and 
  to 
  be 
  probably 
  synclinal 
  in 
  structure 
  ; 
  and 
  all 
  were 
  

   referred, 
  with 
  small 
  exceptions, 
  to 
  the 
  Quebec 
  Group. 
  The 
  object 
  of 
  

   the 
  exploration 
  was 
  the 
  comparison 
  of 
  the 
  rocks 
  with 
  some 
  of 
  those 
  

   of 
  Eastern 
  Canada. 
  

  

  In 
  1861 
  the 
  Geological 
  Report 
  of 
  the 
  State 
  of 
  Vermont, 
  by 
  Pro- 
  

   fessor 
  Edward 
  Hitchcock, 
  Mr. 
  (now 
  Professor) 
  C. 
  H. 
  Hitchcock, 
  his 
  

   son, 
  and 
  Mr. 
  A. 
  D. 
  Hagcr, 
  was 
  published"!*. 
  It 
  is 
  an 
  elaborate 
  re- 
  

   port, 
  extending 
  to 
  988 
  pages 
  quarto, 
  and 
  [containing 
  numerous 
  

   geological 
  sections. 
  On 
  pages 
  251 
  to 
  257, 
  Prof. 
  Edward 
  Hitchcock 
  

   (the 
  State 
  Geologist, 
  earlier, 
  of 
  Massachusetts) 
  describes 
  a 
  section 
  

   through 
  the 
  Taconic 
  range, 
  representing 
  it 
  as 
  consisting 
  of 
  a 
  series 
  

   of 
  conformable 
  folded 
  strata. 
  On 
  pages 
  595 
  to 
  682 
  Prof. 
  C. 
  H. 
  

   Hitchcock 
  gives 
  the 
  details 
  with 
  regard 
  to 
  thirteen 
  sections 
  across 
  

   the 
  State, 
  coloured 
  diagrams 
  of 
  which 
  occupy 
  three 
  long 
  folded 
  

   plates. 
  Seven 
  of 
  these 
  sections 
  cross 
  the 
  Taconic 
  range 
  ; 
  and 
  in 
  all 
  

   but 
  one 
  of 
  the 
  seven 
  the 
  Taconic 
  slates 
  and 
  the 
  adjoining 
  limestone 
  

   (called 
  in 
  the 
  Ecport 
  the 
  Eolian 
  limestone) 
  are 
  made 
  conformable. 
  

   In 
  a 
  southern 
  one 
  of 
  these 
  sections, 
  through 
  the 
  town 
  of 
  Bennington, 
  

   the 
  schists 
  of 
  Mt. 
  Anthony, 
  whose 
  summit 
  is 
  2688 
  feet 
  in 
  height 
  

   above 
  the 
  mean 
  tide-level, 
  overlie 
  the 
  limestone 
  in 
  a 
  shallow 
  syn- 
  

   clinal. 
  In 
  another 
  section, 
  passing 
  through 
  Arlington, 
  and 
  inter- 
  

   secting 
  Spruce 
  Peak, 
  of 
  the 
  Taconic 
  range, 
  the 
  same 
  schists 
  (" 
  tal- 
  

   coid," 
  or 
  Irydromica-schists) 
  overlie 
  in 
  this 
  peak 
  the 
  limestone 
  in 
  a 
  

   still 
  shallower 
  synclinal, 
  the 
  limestone 
  on 
  the 
  east 
  dipping 
  westward 
  

   and 
  that 
  on 
  the 
  west 
  dipping 
  eastward 
  at 
  a 
  small 
  angle. 
  In 
  a 
  third 
  

   section, 
  through 
  Dorset 
  and 
  Dorset 
  Mountain 
  or 
  Mount 
  Eolus 
  (3148 
  

   feet 
  high), 
  this 
  mountain 
  is 
  shown 
  to 
  be 
  made 
  of 
  limestone 
  to 
  within 
  

   500 
  feet 
  of 
  the 
  top. 
  These 
  500 
  feet 
  consist 
  of 
  hydromica-schists 
  ; 
  and 
  

   they 
  lie 
  in 
  the 
  lap 
  of 
  the 
  shallow 
  limestone 
  synclinal, 
  conforming 
  to 
  it 
  

   in 
  bedding. 
  The 
  limestone 
  of 
  the 
  mountain, 
  crystalline, 
  as 
  elsewhere, 
  

   and 
  at 
  several 
  points 
  quarried 
  for 
  marble, 
  has 
  a 
  thickness 
  over 
  1900 
  

   feet. 
  In 
  Mount 
  Equinox, 
  another 
  Vermont 
  peak 
  of 
  the 
  Taconic 
  range, 
  

   3872 
  feet 
  in 
  height, 
  the 
  limestone, 
  according 
  to 
  thclleport, 
  rises 
  as 
  

   high 
  perhaps 
  as 
  in 
  Mount 
  Eolus. 
  The 
  Report 
  also 
  reproduces 
  Pro- 
  

   fessor 
  Emmons's 
  section 
  through 
  Gray 
  lock, 
  in 
  Massachusetts, 
  which 
  

  

  * 
  Eeportecl 
  in 
  a 
  communication 
  to 
  the 
  Natural-History 
  Society 
  of 
  Montreal, 
  

   Oct. 
  24, 
  18G4, 
  by 
  Mr. 
  T. 
  Sterry 
  Hunt, 
  and 
  published 
  in 
  the 
  Canadian 
  Natu- 
  

   ralist 
  and 
  Geologist, 
  and 
  also 
  in 
  the 
  American 
  Journal 
  of 
  Science, 
  second 
  series, 
  

   vol. 
  xxxix. 
  p. 
  96, 
  1865. 
  

  

  t 
  Eeport 
  on 
  the 
  Geology 
  of 
  Vermont. 
  2 
  vols. 
  988 
  pp., 
  4to. 
  with 
  a 
  coloured 
  

   geological 
  map 
  of 
  the 
  State 
  and 
  38 
  plates, 
  1861, 
  

  

  