﻿322 
  J. 
  T* 
  MARK 
  ON 
  THE 
  CAMBRIA 
  K 
  AND 
  

  

  The 
  basement 
  beds 
  of 
  the 
  Silurian 
  everywhere 
  indicate 
  that 
  they 
  

   were 
  deposited 
  in 
  shallow 
  water. 
  Where 
  they 
  consist 
  of 
  thin 
  beds 
  

   of 
  limestone 
  they 
  are 
  immediately 
  succeeded 
  by 
  the 
  Lobiferus-shales, 
  

   as 
  in 
  Dalecarlia, 
  Ostrogothia, 
  and 
  Scania. 
  In 
  Westrogothia 
  the 
  

   upper 
  part 
  of 
  the 
  Brachiopod-beds 
  consists 
  of 
  a 
  series 
  of 
  calcareous 
  

   grits, 
  with 
  fossils 
  of 
  May-Hill 
  facies, 
  the 
  characteristic 
  fossil 
  being 
  

   Phacojps 
  mucronatus. 
  The 
  upper 
  part 
  of 
  these 
  beds 
  contains 
  an 
  

   admixture 
  of 
  the 
  Brachiopod-bed 
  fauna 
  with 
  Graptolites 
  characteristic 
  

   of 
  the 
  Lobiferus-shales. 
  At 
  Christiania 
  the 
  basement-conglomerate 
  

   of 
  the 
  Silurian 
  is 
  succeeded 
  by 
  shales 
  with 
  a 
  characteristic 
  May-Hill 
  

   fauna, 
  such 
  as 
  Nidulites 
  favus, 
  Stric/clandinia 
  I'wata, 
  Pluacops 
  mu- 
  

   cronatus, 
  and 
  Ph. 
  elegans, 
  Bceck 
  and 
  Sars. 
  "With 
  these 
  fossils, 
  as 
  

   before 
  mentioned, 
  is 
  Ctimacograptus 
  nor 
  malts. 
  These 
  beds, 
  then, 
  

   appear 
  to 
  be 
  the 
  representatives 
  of 
  the 
  Birkhill 
  shales, 
  as 
  are 
  

   perhaps 
  in 
  part 
  the 
  succeeding 
  Pentamerus- 
  and 
  coral-limestones. 
  

   The 
  green 
  Encrinital 
  shales 
  above 
  this 
  probably 
  represent 
  the 
  

   Tarannon 
  shales, 
  as 
  they 
  arc 
  in 
  turn 
  immediately 
  overlain 
  by 
  

   blue 
  flags 
  with 
  Monograjptus 
  jctriodon, 
  &c. 
  The 
  May-Hill 
  beds 
  of 
  

   Scandinavia 
  seem 
  to 
  have 
  been 
  deposited 
  for 
  the 
  most 
  part 
  in 
  

   shallower 
  water 
  than 
  the 
  corresponding 
  Birkhill 
  shales 
  of 
  Britain, 
  

   but 
  in 
  deeper 
  water 
  than 
  the 
  beds 
  of 
  the 
  typical 
  Llandovery 
  area 
  ; 
  they 
  

   arc 
  therefore 
  of 
  great 
  value, 
  as 
  presenting 
  us 
  with 
  a 
  type 
  intermediate 
  

   in 
  character 
  between 
  our 
  two 
  widely 
  different 
  Llandovery 
  types. 
  

   The 
  occurrence 
  of 
  a 
  Bemopleurides 
  in 
  these 
  beds 
  at 
  Christiania 
  is 
  

   noteworthy, 
  as 
  this 
  genus 
  occurs 
  in 
  still 
  higher 
  beds 
  in 
  Dalecarlia. 
  

   Tri 
  nucleus 
  Wahlenbergi 
  is 
  recorded 
  by 
  Prof. 
  Kjcrulf 
  as 
  occurring 
  in 
  

   these 
  beds 
  ; 
  it 
  is 
  possible 
  that 
  this 
  may 
  be 
  a 
  rernanie 
  fossil, 
  derived 
  

   from 
  Cambrian 
  beds. 
  

  

  It 
  was 
  before 
  suggested 
  that 
  certain 
  green 
  beds 
  at 
  Kinnekulle 
  in 
  

   Westrogothia 
  might 
  be 
  the 
  representatives 
  of 
  the 
  Tarannon 
  shales. 
  

   In 
  Dalecarlia 
  there 
  is 
  no 
  similar 
  lithological 
  band, 
  and 
  the 
  Lobiferus- 
  

   shales 
  pass 
  into 
  the 
  Ketiolitcs- 
  shales. 
  These 
  passage-beds 
  arc 
  

   undoubtedly 
  of 
  Tarannon 
  age, 
  as 
  they 
  contain 
  an 
  admixture 
  of 
  the 
  

   species 
  of 
  the 
  two 
  faunas, 
  as 
  discovered 
  by 
  Dr. 
  Tbrnqvist. 
  

  

  I 
  have 
  since 
  found 
  that 
  a 
  zone 
  at 
  Kuchelbad, 
  Bohemia, 
  yields 
  a 
  

   similar 
  admixture, 
  and 
  occupies 
  a 
  position 
  corresponding 
  with 
  that 
  

   of 
  the 
  zone 
  at 
  Kallholn. 
  

  

  The 
  fauna 
  of 
  the 
  Betiolites-beds 
  of 
  Scandinavia 
  is 
  quite 
  similar 
  to 
  

   that 
  of 
  Bohemia 
  and 
  Britain 
  ; 
  so 
  that 
  there 
  is 
  no 
  doubt 
  whatever 
  

   about 
  the 
  correlation 
  of 
  these 
  beds. 
  

  

  Above 
  the 
  Betiolites-beds 
  of 
  Dalecarlia 
  is 
  the 
  Leptaena-limestone, 
  

   to 
  the 
  fauna 
  of 
  which 
  I 
  shall 
  refer 
  more 
  particularly 
  when 
  consider- 
  

   ing 
  migrations. 
  It 
  may 
  possibly 
  be 
  in 
  part 
  the 
  equivalent 
  of 
  the 
  

   upper 
  part 
  of 
  the 
  Brathay 
  flags 
  of 
  the 
  Lake-district, 
  or 
  may 
  be 
  still 
  

   higher 
  : 
  at 
  any 
  rate 
  it 
  must 
  be 
  "Wenlock, 
  although 
  it 
  has 
  a 
  consider- 
  

   able 
  mixture 
  of 
  Llandovery 
  forms. 
  

  

  It 
  is 
  doubtful 
  whether 
  any 
  beds 
  occur 
  at 
  a 
  higher 
  horizon 
  than 
  

   the 
  Kctiolites-beds 
  of 
  Westrogothia 
  ; 
  but 
  I 
  referred 
  before 
  to 
  the 
  

   possible 
  occurrence 
  of 
  beds 
  with 
  Monogravptus 
  colonus 
  at 
  Kinne- 
  

   kulle. 
  

  

  