﻿302 
  Scientific 
  Intelligence. 
  

  

  of 
  fishes, 
  eurypterids, 
  etc., 
  resembling 
  those 
  occurring 
  in 
  the 
  

   Ludlow 
  rocks 
  of 
  Lanarkshire 
  and 
  other 
  regions." 
  w. 
  

  

  yS 
  3. 
  Lower 
  Cambrian 
  Terr 
  an 
  e 
  in, 
  the 
  Atlantic 
  Province 
  / 
  by 
  

   Charles 
  D. 
  Walcott. 
  Proceedings 
  of 
  the 
  Washington 
  Academy 
  

   of 
  Science, 
  Vol. 
  I, 
  Plates 
  xxii-xxvi, 
  figs. 
  9-11, 
  pp. 
  301-339, 
  

   1900. 
  — 
  The 
  study 
  of 
  the 
  New 
  Brunswick 
  and 
  Newfoundland 
  

   lowest 
  Paleozoic 
  rocks 
  has 
  led 
  Mr. 
  G. 
  F. 
  Matthew 
  to 
  the 
  estab- 
  

   lishment 
  of 
  a 
  basal 
  or 
  Etcheminian 
  series 
  of 
  rocks 
  of 
  supposed 
  

   pre-Cambrian 
  age, 
  and 
  the 
  adoption 
  by 
  him 
  of 
  a 
  classification 
  

   which 
  recognized 
  only 
  two 
  divisions 
  of 
  the 
  Cambrian, 
  an 
  Upper 
  

   Cambrian 
  (Potsdam 
  with 
  Olenus 
  fauna) 
  ,and 
  a 
  "Lower" 
  Cam- 
  

   brian 
  (with 
  the 
  Paradoxides 
  fauna), 
  equivalent 
  to 
  the 
  Middle 
  

   Cambrian, 
  or 
  Acadian, 
  but 
  including 
  the 
  subjacent 
  Protolenus 
  

   fauna, 
  which 
  he 
  regarded 
  as 
  equivalent 
  to 
  the 
  Olenellus 
  fauna 
  of 
  

   the 
  Georgian 
  or 
  Lower 
  Cambrian. 
  

  

  Mr. 
  Walcott, 
  after 
  exhaustive 
  study 
  of 
  the 
  original 
  sections 
  

   upon 
  which 
  Mr. 
  Matthew's 
  interpretations 
  were 
  made, 
  both 
  in 
  

   Newfoundland 
  and 
  New 
  Brunswick, 
  establishes 
  the 
  following 
  

   conclusions 
  : 
  

  

  " 
  (a) 
  The 
  'Etcheminian' 
  terrane 
  of 
  Matthew 
  is 
  of 
  Lower 
  Cam- 
  

   brian 
  age. 
  

  

  " 
  (b) 
  The 
  Olenellus 
  fauna 
  is 
  older 
  than 
  the 
  Paradoxides 
  and 
  

   Protolenus 
  faunas 
  of 
  the 
  Middle 
  Cambrian. 
  

  

  " 
  (c) 
  The 
  Cambrian 
  section 
  of 
  the 
  Atlantic 
  Province 
  of 
  North 
  

   America 
  includes 
  the 
  Lower, 
  Middle, 
  and 
  Upper 
  Cambrian 
  

   divisions 
  as 
  defined 
  by 
  me 
  in 
  1891." 
  

  

  These 
  are 
  supported 
  by 
  the 
  following 
  facts 
  : 
  

  

  "(a) 
  That 
  the 
  Olenellus 
  fauna 
  in 
  Newfoundland 
  occurs 
  420 
  

   feet 
  beneath 
  the 
  Paradoxides 
  fauna, 
  in 
  the 
  heart 
  of 
  the 
  Lower 
  

   Cambrian 
  ' 
  Etcheminian.' 
  

  

  " 
  (b) 
  That 
  fragments 
  of 
  the 
  fauna 
  are 
  found 
  460-480 
  feet 
  

   below 
  the 
  Protolenus 
  fauna 
  in 
  the 
  ' 
  Etcheminian 
  ' 
  of 
  the 
  Hanford 
  

   Brook 
  section 
  of 
  New 
  Brunswick. 
  

  

  " 
  (c) 
  That 
  in 
  the 
  undisturbed, 
  unbroken 
  Highland 
  Range 
  sec- 
  

   tion 
  of 
  Nevada 
  the 
  Olenellus 
  fauna 
  is 
  4450 
  feet 
  below 
  the 
  Upper 
  

   Cambrian 
  fauna, 
  and 
  that 
  the 
  Olenoides 
  (Dorypyge 
  fauna 
  of 
  

   Matthew) 
  is 
  3000 
  feet 
  below 
  the 
  horizon 
  of 
  the 
  Upper 
  Cambrian 
  

   fauna 
  and 
  1450 
  feet 
  above 
  the 
  horizon 
  of 
  the 
  Olenellus 
  g 
  lib 
  erti 
  

   fauna. 
  

  

  " 
  (d) 
  That 
  in 
  the 
  southern 
  Appalachians 
  the 
  Olenellus 
  fauna 
  

   occurs 
  more 
  than 
  7000 
  feet 
  below 
  the 
  highest 
  Cambrian 
  fauna 
  

   known 
  in 
  that 
  region, 
  and 
  fully 
  2000 
  feet 
  below 
  a 
  typical 
  Ole- 
  

   noides 
  fauna." 
  w. 
  

  

  4. 
  Geological 
  Survey 
  of 
  Canada, 
  George 
  M. 
  Dawson, 
  Direc- 
  

   tor. 
  — 
  Accompanying 
  three 
  sheets 
  of 
  a 
  revised 
  edition 
  of 
  the 
  

   Geological 
  map 
  of 
  the 
  Sidney 
  Coal 
  field 
  (sheets 
  133, 
  134, 
  and 
  

   135; 
  new 
  numbers, 
  652, 
  653, 
  and 
  654), 
  the 
  Survey 
  publishes 
  a 
  

   Descriptive 
  note 
  on 
  the 
  Sydney 
  Coal 
  field, 
  Cape 
  Breton, 
  Nova 
  

   Scotia 
  (No. 
  685). 
  The 
  Barachios 
  slates 
  are 
  reported 
  as 
  Cambrian 
  

   (from 
  Etcheminian 
  to 
  Lingula 
  Flags), 
  according 
  to 
  determi- 
  

  

  