﻿AOE 
  OP 
  THE 
  TACONtC 
  SYSTEM. 
  401 
  

  

  represents 
  it 
  as 
  a 
  synclinal 
  of 
  schists 
  underlain 
  by 
  limestone, 
  the 
  

   limestone 
  outcropping 
  on 
  the 
  east 
  with 
  a 
  westward 
  dip 
  near 
  South 
  

   Adams. 
  

  

  The 
  Keport 
  thus 
  illustrates 
  the 
  conformability 
  of 
  the 
  limestone 
  

   and 
  schists 
  in 
  various 
  parts 
  of 
  the 
  range 
  through 
  Vermont 
  (south 
  

   of 
  Middlebury), 
  and 
  adds 
  confirming 
  facts 
  from 
  Massachusetts. 
  

  

  The 
  Report 
  also 
  mentions 
  the 
  occurrence 
  of 
  fossils 
  in 
  the 
  " 
  Eolian 
  

   limestone," 
  near 
  its 
  junction 
  with 
  the 
  schists, 
  and 
  principally 
  from 
  

   outcrops 
  just 
  west 
  of 
  them. 
  

  

  These 
  fossils 
  are 
  stems 
  of 
  Crinoids, 
  Cyathophylloid 
  corals 
  (re- 
  

   ferred 
  incorrectly 
  to 
  the 
  genus 
  ZapJirentis), 
  species 
  of 
  Chcetetes 
  and 
  

   Stictopora, 
  and 
  a 
  Gasteropod 
  shell 
  referred 
  by 
  Hall 
  to 
  Euomplialus. 
  

   Prof. 
  C. 
  H. 
  Hitchcock, 
  in 
  a 
  note 
  to 
  me 
  in 
  1880, 
  describing 
  his 
  

   views 
  and 
  those 
  of 
  the 
  Yermont 
  Geological 
  Report 
  on 
  this 
  subject 
  

   of 
  the 
  Taconic 
  Schists, 
  says 
  (see 
  American 
  Journal 
  of 
  Science, 
  

   volume 
  xix. 
  p. 
  237): 
  — 
  "There 
  is 
  nothing 
  in 
  the 
  Vermont 
  Report 
  

   anywhere 
  favourable 
  to 
  Taconism. 
  Within 
  the 
  past 
  two 
  years 
  1 
  

   have 
  gone 
  over 
  most 
  of 
  the 
  Vermont 
  sections, 
  and 
  have 
  felt 
  that 
  

   they 
  demonstrated 
  the 
  essential 
  equivalence 
  of 
  the 
  Taconic 
  system 
  

   with 
  the 
  Potsdam 
  and 
  the 
  overlying 
  limestones 
  and 
  slates 
  [of 
  the 
  

   Lower 
  Silurian]. 
  I 
  have 
  been 
  throughout 
  in 
  essential 
  accord 
  with 
  

   you 
  and 
  Mr. 
  Wing." 
  

  

  Mr. 
  A. 
  Wing, 
  of 
  Whiting 
  and 
  afterwards 
  of 
  Middlebury, 
  Ver- 
  

   mont, 
  contributed 
  some 
  aid 
  toward 
  the 
  Geological 
  Survey 
  of 
  the 
  

   State 
  of 
  Vermont 
  (the 
  Preface 
  to 
  the 
  Report 
  acknowledging 
  

   "valuable 
  facts 
  aud 
  suggestions" 
  from 
  him, 
  "a 
  gentleman 
  who 
  

   had 
  studied 
  the 
  geology 
  of 
  the 
  State 
  with 
  great 
  perseverance 
  and 
  

   success''). 
  His 
  conclusion 
  was 
  in 
  harmony 
  with 
  that 
  of 
  the 
  

   Report 
  — 
  namely, 
  that 
  the 
  Taconic 
  schists 
  and 
  limestone 
  and 
  the 
  

   associated 
  quartzite 
  to 
  the 
  eastward 
  were 
  conformable 
  Lower 
  

   Silurian 
  formations. 
  Mr. 
  Wing's 
  researches 
  were 
  continued 
  

   afterward 
  until 
  his 
  death 
  in 
  1875*. 
  In 
  1866 
  he 
  found 
  Trinu- 
  

   deus 
  concentricus 
  and 
  other 
  Trenton 
  fossils 
  in 
  the 
  limestone 
  

   of 
  Sudbury, 
  Vermont, 
  just 
  east 
  of, 
  or 
  more 
  properly 
  within, 
  the 
  

   Taconic 
  belt, 
  and 
  came 
  to 
  the 
  conclusion 
  that, 
  since 
  the 
  lime- 
  

   stone 
  plainly 
  dipped 
  conformably 
  beneath 
  the 
  Taconic 
  Schists, 
  the 
  

   latter 
  were 
  younger 
  than 
  the 
  Trenton 
  — 
  that 
  is, 
  equivalent 
  to 
  the 
  

   Hudson-river 
  slates, 
  the 
  last 
  member 
  of 
  the 
  Lower 
  Silurian. 
  

   Before 
  the 
  year 
  1872 
  (as 
  may 
  be 
  found 
  in 
  my 
  article 
  in 
  vol. 
  xiii. 
  

   of 
  the 
  American 
  Journal 
  of 
  Science) 
  his 
  discoveries 
  comprised 
  

   various 
  other 
  Trenton 
  fossils, 
  besides 
  species 
  of 
  the 
  Quebec 
  and 
  

   Calciferous 
  groups 
  (as 
  determined 
  by 
  Mr. 
  Billings, 
  of 
  the 
  Canadian 
  

   Survey, 
  to 
  whom 
  he 
  sent 
  his 
  specimens), 
  many 
  of 
  them 
  from 
  the 
  

   limestone 
  belt 
  tuest 
  of 
  the 
  Taconic, 
  and 
  many 
  also 
  from 
  that 
  to 
  the 
  

   east. 
  Among 
  the 
  Trenton 
  species 
  discovered 
  by 
  him 
  there 
  are 
  tho 
  

   common 
  Cyathophylloid 
  coral 
  Petraia 
  profunda, 
  also 
  Ueceptaculites 
  

   neptuni, 
  Colamnaria 
  alveolata, 
  Stenopora 
  fibrosa, 
  St. 
  petropolitana, 
  

  

  * 
  See 
  " 
  An 
  account 
  of 
  the 
  discoveries 
  in 
  Vermont 
  Geology 
  of 
  the 
  Rev. 
  

   Augustus 
  Wing, 
  by 
  J. 
  D. 
  Dana," 
  in 
  the 
  Amer. 
  Joarn. 
  Sci., 
  third 
  series, 
  vol. 
  xiii. 
  

   pp. 
  332, 
  405, 
  and 
  vol. 
  xiv. 
  p. 
  36, 
  1877. 
  

  

  