﻿408 
  ON 
  THE 
  GEOLOGICAL 
  AGE 
  OF 
  THE 
  TACONIC 
  SYSTEM. 
  

  

  EXPLANATION 
  OF 
  PLATE 
  XVII. 
  

  

  Geological 
  Chart 
  of 
  part 
  of 
  Western 
  New 
  England 
  and 
  Eastern 
  New 
  York, 
  

   representing 
  the 
  areas 
  of 
  the 
  Taconic 
  schists 
  and 
  the 
  associated 
  limestones 
  

   and 
  quartzite. 
  The 
  blank 
  area 
  to 
  the 
  east 
  is 
  occupied 
  mainly 
  by 
  gneiss 
  and 
  

   mica-schist 
  ; 
  and 
  that 
  to 
  the 
  west, 
  for 
  the 
  most 
  part 
  by 
  the 
  semicrystalline 
  

   schist, 
  argillite, 
  and 
  hydromica-schist. 
  The 
  quartzite 
  formation 
  extends 
  south 
  

   of 
  the 
  area 
  so 
  marked, 
  through 
  Massachusetts 
  into 
  Connecticut 
  ; 
  but 
  the 
  areas 
  

   of 
  quartzite 
  being 
  small 
  and 
  not 
  yet 
  accurately 
  mapped, 
  they 
  have 
  been 
  omitted. 
  

  

  Discussion. 
  

  

  Dr. 
  Hicks 
  remarked 
  that 
  the 
  Taconic 
  controversy 
  greatly 
  re- 
  

   sembled 
  that 
  going 
  on 
  in 
  this 
  country 
  with 
  regard 
  to 
  the 
  rocks 
  

   of 
  the 
  North-west 
  Highlands. 
  In 
  the 
  absence 
  of 
  Dr. 
  Sterry 
  Hunt 
  

   he 
  must 
  oppose 
  the 
  views 
  enunciated 
  by 
  Prof. 
  Dana. 
  He 
  thought 
  

   that 
  the 
  disturbed 
  rocks 
  of 
  North 
  Wales 
  explained 
  clearly 
  how 
  

   newer 
  strata 
  were 
  continually 
  made 
  to 
  appear 
  to 
  dip 
  under 
  the 
  

   older 
  ones, 
  and 
  the 
  evidence 
  generally 
  quite 
  bore 
  out 
  the 
  views 
  

   of 
  Dr. 
  Hunt. 
  

  

  Prof. 
  Duncan 
  stated 
  that 
  the 
  Society 
  received 
  with 
  great 
  pleasure 
  

   this 
  paper 
  from 
  a 
  great 
  master 
  of 
  geology. 
  Prof. 
  Dana 
  described 
  

   the 
  country 
  as 
  not 
  greatly 
  disturbed 
  by 
  faults. 
  He 
  was 
  inclined 
  to 
  

   accept 
  the 
  idea 
  that 
  metamorphism 
  may 
  have 
  gone 
  on 
  during 
  any 
  

   part 
  of 
  the 
  earth's 
  history. 
  

  

  Prof. 
  Judd, 
  in 
  the 
  absence 
  of 
  Prof. 
  Dana, 
  stated 
  that«that 
  author 
  

   used 
  the 
  term 
  Silurian 
  in 
  the 
  same 
  sense 
  as 
  M. 
  Barrande 
  and 
  the 
  

   late 
  Sir 
  Roderick 
  Murchison. 
  He 
  admitted 
  that 
  the 
  limestone 
  

   series 
  contained 
  fossils 
  which 
  proved 
  them 
  to 
  represent 
  the 
  whole 
  

   series, 
  from 
  the 
  Primordial 
  up 
  to 
  the 
  Upper 
  Silurian. 
  He 
  had 
  also 
  

   distinctly 
  stated 
  that 
  a 
  number 
  of 
  Lower 
  Silurian 
  fossils 
  had 
  been 
  

   found 
  not 
  only 
  in 
  the 
  limestones 
  but 
  also 
  in 
  the 
  schists, 
  and 
  in 
  

   schists 
  which 
  had 
  been 
  expressly 
  stated 
  by 
  Emmons 
  to 
  be 
  a 
  portion 
  

   of 
  his 
  Taconic 
  system. 
  

  

  