﻿Schuchert 
  — 
  The 
  laconic 
  System 
  Resurrected. 
  115 
  

  

  "Olenellus 
  callavei 
  appears 
  to 
  be 
  strictly 
  confined 
  to 
  

   that 
  part 
  of 
  the 
  Comley 
  series 
  which 
  lies 
  below 
  the 
  con- 
  

   glomerate 
  bands 
  mentioned 
  above 
  ; 
  and 
  its 
  associates 
  

   include 
  Kittorgina 
  cingulata, 
  Linnarssonia 
  sagittalis, 
  

   Hyolithellus 
  (compare 
  H. 
  micans, 
  Walcott) 
  and 
  Ellipto- 
  

   cephalus, 
  sp. 
  

  

  "AVe 
  possess 
  in 
  the 
  foregoing 
  facts 
  sufficient 
  paleonto- 
  

   logical 
  evidence 
  to 
  establish 
  the 
  Lower 
  Cambrian 
  age 
  of 
  

   that 
  part 
  of 
  the 
  Comley 
  series 
  which 
  contains 
  the 
  genus 
  

   Olenellus; 
  and 
  we 
  have 
  now 
  obtained 
  stratigraphical 
  and 
  

   paleontological 
  proof 
  that 
  it 
  is 
  succeeded 
  at 
  once 
  by 
  the 
  

   so-called 
  Middle 
  Cambrian 
  or 
  Paradoxidian. 
  Further, 
  as 
  

   Dr. 
  Callaway 
  originally 
  pointed 
  out 
  some 
  years 
  ago, 
  the 
  

   Hollybush 
  (or 
  Comley 
  Sandstone) 
  series 
  is 
  followed 
  in 
  

   turn 
  by 
  the 
  Shineton 
  Shales, 
  which 
  contain 
  locally 
  a 
  fauna 
  

   of 
  highest 
  Cambrian 
  age. 
  In 
  these 
  central 
  Shropshire 
  

   rocks, 
  therefore, 
  the 
  Comley 
  and 
  Shineton 
  groups, 
  which 
  

   constitute 
  an 
  integral 
  part 
  in 
  this 
  district 
  of 
  Murchison's 
  

   original 
  Lower 
  Silurian, 
  and 
  have 
  a 
  collective 
  thickness 
  of 
  

   perhaps 
  less 
  than 
  3000 
  feet, 
  we 
  have 
  apparently 
  a 
  con- 
  

   densed 
  epitome 
  of 
  the 
  entire 
  Cambrian 
  system 
  as 
  at 
  

   present 
  generally 
  defined. 
  

  

  "Here, 
  as 
  elsewhere, 
  we 
  find 
  the 
  Cambrian 
  divisible 
  

   into 
  three 
  sections 
  — 
  an 
  Upper 
  Cambrian 
  above, 
  marked 
  

   by 
  the 
  presence 
  of 
  the 
  genus 
  Olenus 
  (Olenidian) 
  ; 
  a 
  

   Middle 
  Cambrian 
  group 
  with 
  Paradoxides 
  (Menevian 
  or 
  

   Paradoxidian) 
  ; 
  and 
  finally 
  a 
  Lower 
  Cambrian 
  (Olenellus 
  

   zone) 
  or 
  basal 
  group 
  (possibly 
  of 
  somewhat 
  different 
  

   systematic 
  importance), 
  distinguished 
  by 
  the 
  presence 
  of 
  

   Olenellus. 
  No 
  one 
  has 
  yet, 
  so 
  far 
  as 
  I 
  know, 
  suggested 
  

   any 
  general 
  title 
  for 
  the 
  basal 
  division 
  of 
  the 
  Cambrian. 
  

   Recollecting, 
  however, 
  that 
  the 
  very 
  first 
  discovered 
  

   species 
  of 
  the 
  genus 
  Olenellus 
  was 
  named 
  and 
  figured 
  3 
  by 
  

   the 
  American 
  geologist, 
  Dr. 
  Emmons, 
  as 
  early 
  as 
  1846 
  

   from 
  the 
  rocks 
  of 
  his 
  Taconic 
  or 
  Taconian 
  system 
  ; 
  and 
  

   was 
  claimed 
  by 
  him 
  as 
  early 
  as 
  1853 
  as 
  coming 
  from 
  

   strata 
  older 
  than 
  any 
  of 
  the 
  fossil-bearing 
  Silurian 
  

   (including 
  the 
  Primordial 
  zone) 
  then 
  discovered; 
  while 
  

   even 
  at 
  the 
  present 
  day 
  the 
  genus 
  holds 
  its 
  own 
  as 
  mark- 
  

   ing 
  a 
  distinct 
  and 
  identifiable 
  life-zone 
  in 
  the 
  strata 
  of 
  

   Emmons 
  ' 
  typical 
  Taconic 
  area 
  ; 
  it 
  would 
  be 
  very 
  conven- 
  

   ient 
  if 
  geologists 
  and 
  paleontologists 
  generally 
  would 
  

   agree 
  in 
  calling 
  it 
  the 
  Taconian" 
  (pp. 
  532-533). 
  

  

  3 
  As 
  Elliptocepliala 
  asaphoides, 
  Emmons, 
  Taconic 
  System, 
  1846, 
  p. 
  213, 
  

   figs. 
  1-3. 
  

  

  