﻿116 
  Schuchert 
  — 
  The 
  Taconic 
  System 
  Resurrected. 
  

  

  In 
  summing 
  up, 
  Lapworth 
  says: 
  "The 
  students 
  of 
  

   these 
  old 
  rocks 
  (however 
  much 
  they 
  may 
  conscientiously 
  

   differ 
  in 
  the 
  provisional 
  nomenclature 
  in 
  which 
  they 
  

   clothe 
  their 
  facts) 
  have 
  now 
  all 
  more 
  or 
  less 
  attained 
  to 
  

   the 
  conviction 
  that 
  we 
  are 
  at 
  last 
  reaching 
  a 
  satisfactory 
  

   homotaxial 
  base 
  to 
  the 
  Paleozoic 
  rock-series. 
  "We 
  now 
  

   see 
  that 
  the 
  Lower 
  Paleozoic 
  cycle 
  of 
  formations 
  (the 
  

   Protozoic 
  or 
  Protogean) 
  or 
  the 
  Silurian 
  of 
  Murchison's 
  

   'Siluria' 
  and 
  Barrande's 
  'Systeme' 
  has 
  proved 
  itself 
  

   to 
  be 
  a 
  geological 
  cycle 
  of 
  the 
  first 
  order. 
  ' 
  We 
  agree, 
  in 
  

   principle, 
  that 
  it 
  is 
  made 
  up 
  (like 
  each 
  of 
  the 
  succeeding 
  

   great 
  cycles) 
  of 
  three 
  sub-equal 
  groups 
  or 
  systems 
  — 
  an 
  

   Upper 
  system 
  (the 
  > 
  Silurian 
  proper, 
  or 
  Salopian), 
  a 
  

   Middle 
  system 
  (the 
  Ordovician), 
  and 
  a 
  Lower 
  system 
  

   (the 
  Cambrian). 
  This 
  lower 
  system, 
  like 
  each 
  of 
  the 
  two 
  

   systems 
  above 
  it, 
  has 
  now 
  shown 
  itself 
  divisible 
  in 
  its 
  

   turn 
  into 
  three 
  sections 
  — 
  an 
  Upper 
  Cambrian 
  (Olenid- 
  

   ian), 
  a 
  Middle 
  Cambrian 
  (Paradoxidian) 
  and 
  a 
  Lower 
  

   Cambrian 
  (Taconian). 
  Underneath 
  this 
  Cambrian 
  lie 
  

   sometimes 
  conformably, 
  sometimes 
  unconformably, 
  the 
  

   strata 
  of 
  the 
  mysterious 
  cycles 
  of 
  the 
  Pre-Cambrian 
  (or 
  

   Archean)" 
  (p. 
  535). 
  

  

  