﻿114 
  Schuchert 
  — 
  The 
  Taconic 
  System 
  Resurrected. 
  

  

  top 
  of 
  Caradoc 
  in 
  Europe. 
  Beekmantown 
  to 
  top 
  of 
  Rich- 
  

   mondian 
  in 
  America. 
  

  

  "Cambrian 
  period. 
  In 
  the 
  Atlantic 
  realm, 
  begins 
  with 
  the 
  

   Paradoxides, 
  and 
  in 
  the 
  Pacific, 
  with 
  the 
  Bathyuriscus 
  and 
  

   Ogygopsis 
  faunas. 
  The 
  close 
  is 
  involved 
  in 
  Ulrich's 
  provi- 
  

   sionally 
  defined 
  Ozarkian 
  system. 
  When 
  the 
  latter 
  is 
  

   established, 
  the 
  Ozarkian 
  period 
  will 
  hold 
  the 
  time 
  between 
  

   the 
  Ordovician 
  and 
  the 
  Cambrian. 
  

  

  ' 
  ' 
  Taconic 
  period. 
  For 
  the 
  world-wide 
  Olenellus 
  or 
  Mesonacidae 
  

   faunas" 
  (pp. 
  82-83). 
  

  

  In 
  the 
  English 
  weekly, 
  Nature, 
  for 
  September 
  19, 
  1918, 
  

   the 
  Centennial 
  number 
  is 
  noticed, 
  and 
  among 
  other 
  com- 
  

   ments 
  we 
  read 
  the 
  following: 
  "The 
  essay 
  on 
  'The 
  Pro- 
  

   gress 
  of 
  Historical 
  Geology 
  in 
  North 
  America/ 
  by 
  

   Charles 
  Schuchert, 
  contains 
  important 
  remarks 
  in 
  stratig- 
  

   raphy, 
  and 
  the 
  following 
  classification 
  is 
  proposed 
  foT 
  

   the 
  older 
  Paleozoic 
  systems: 
  — 
  Taconic 
  (Olenellus 
  beds), 
  

   Cambrian, 
  Champlain 
  or 
  Ordovician, 
  and 
  Silurian. 
  The 
  

   author 
  does 
  not 
  seem 
  aware 
  of 
  Charles 
  Lapworth's 
  sup- 
  

   port 
  and 
  revival 
  of 
  the 
  term 
  Taconic 
  in 
  1891" 
  (p. 
  50). 
  

   This 
  was 
  agreeable 
  news 
  to 
  the 
  writer, 
  and 
  as 
  American 
  

   stratigraphers 
  will 
  want 
  this 
  important 
  information, 
  

   originally 
  published 
  in 
  the 
  Geological 
  Magazine 
  for 
  

   December, 
  1891, 
  pages 
  529-536, 
  under 
  the 
  title 
  ' 
  ' 
  On 
  Ole- 
  

   nellus 
  callavei 
  and 
  its 
  geological 
  relationships," 
  it 
  is 
  

   here 
  republished 
  for 
  more 
  accessible 
  reference. 
  

  

  The 
  Lower 
  Cambrian 
  trilobite 
  Olenellus 
  (— 
  Callavia 
  

   callavei) 
  occurs 
  "near 
  the 
  base 
  of 
  the 
  Comley 
  sandstone 
  

   (Hollybush) 
  series 
  of 
  central 
  Shropshire 
  ... 
  at 
  the 
  foot 
  

   of 
  the 
  hill 
  of 
  Little 
  Caradoc, 
  near 
  Church 
  Stretton. 
  In 
  

   this 
  district 
  the 
  Olenellus 
  -hearing 
  sandstone 
  passes 
  down 
  

   into 
  olive-green 
  felspathic 
  flags, 
  grits, 
  and 
  concretionary 
  

   shales, 
  and 
  the 
  base 
  of 
  the 
  entire 
  Comley 
  Sandstone 
  

   series 
  is 
  formed 
  of 
  the 
  well-known 
  Caradoc 
  or 
  Wrekin 
  

   Quartzite, 
  which 
  reposes 
  unconformably 
  upon 
  the 
  vol- 
  

   canic 
  Uriconian 
  Group 
  of 
  Callaway. 
  The 
  Olenellus- 
  

   bearing 
  beds 
  are 
  overlain 
  at 
  once 
  by 
  conglomerates, 
  1 
  and 
  

   gritty 
  and 
  quartzose 
  strata, 
  containing 
  abundant 
  frag- 
  

   ments 
  of 
  igneous 
  rocks, 
  concretions 
  of 
  carbonate 
  of 
  

   copper, 
  calcareous 
  bands, 
  2 
  and 
  limy 
  nodules; 
  and 
  these 
  

   in 
  turn 
  pass 
  up 
  into 
  flaggy 
  shales 
  and 
  quartzose 
  grits, 
  

   forming 
  the 
  highest 
  visible 
  parts 
  of 
  the 
  Comley 
  series. 
  

  

  1 
  T 
  1 
  1 
  i 
  s 
  important 
  statement 
  should 
  be 
  carefully 
  noted. 
  

   ■ 
  With 
  Paradoxides 
  groomei 
  Lapworth. 
  

  

  