﻿SILURIAN 
  ROCKS 
  OF 
  SCANDINAVIA. 
  319 
  

  

  The 
  sequence 
  above 
  the 
  Trinucleus-shales 
  is 
  strikingly 
  similar 
  to 
  

   that 
  of 
  Westrogothia. 
  As 
  in 
  that 
  province, 
  so 
  here, 
  those 
  shales 
  are 
  

   overlain 
  by 
  greenish 
  shales 
  and 
  calcareous 
  heds^itla.Sj>hcerexocJms, 
  &c; 
  

   and 
  above 
  these 
  are 
  blue 
  flaggy 
  beds 
  with 
  Phacops 
  eucentra, 
  Aug., 
  

   which 
  was 
  described 
  and 
  figured 
  from 
  specimens 
  out 
  of 
  these 
  beds 
  at 
  

   Kostanga. 
  The 
  same 
  species 
  occurs 
  in 
  similar 
  beds 
  at 
  Borenshult, 
  

   in 
  Ostrogothia. 
  These 
  blue 
  flags, 
  I 
  am 
  informed 
  by 
  Dr. 
  Tullberg, 
  

   are 
  succeeded 
  by 
  a 
  band 
  of 
  limestone, 
  one 
  or 
  two 
  feet 
  in 
  thick- 
  

   ness, 
  above 
  which 
  are 
  the 
  Lobiferus- 
  shales. 
  The 
  Lobiferus-beds 
  

   are 
  overlain 
  by 
  Retiolites 
  -shales, 
  and 
  these 
  by 
  beds 
  containing 
  

   Monograptus 
  colonics, 
  M. 
  boJiemicus, 
  Cardiola 
  intemvpta, 
  &c. 
  They 
  

   are 
  greyish-green 
  gritty 
  shales, 
  with 
  large 
  lenticular 
  masses 
  of 
  lime- 
  

   stone, 
  as 
  at 
  Bjersjolagard, 
  which 
  contain 
  characteristic 
  Wenlock 
  fossils. 
  

   This 
  is 
  succeeded 
  by 
  grey 
  gritty 
  shales, 
  lithologically 
  continuous 
  

   with 
  the 
  Gardiola-beds, 
  but 
  poorly 
  fossiliferous 
  ; 
  and 
  above 
  these 
  

   come 
  green 
  shales 
  and 
  sandstones, 
  yellow 
  at 
  Bjersjolagard, 
  red 
  at 
  

   Ramsasa, 
  with 
  characteristic 
  Ludlow 
  fossils. 
  

  

  Y. 
  Baltic 
  Islands. 
  — 
  Gothland. 
  In 
  a 
  hasty 
  examination 
  of 
  the 
  

   principal 
  sections 
  of 
  this 
  island 
  I 
  could 
  not 
  see 
  sufficient 
  evidence 
  to 
  

   prove 
  that 
  there 
  are 
  two 
  distinct 
  masses 
  of 
  limestone, 
  representing 
  

   Wenlock 
  and 
  Aymestry 
  limestones 
  respectively, 
  as 
  described 
  by 
  

   Murchison. 
  The 
  dip 
  is 
  so 
  slight 
  that 
  it 
  is 
  impossible 
  to 
  tell 
  whether, 
  

   the 
  Visby 
  limestone 
  dips 
  under 
  that 
  of 
  Klinte 
  ; 
  and 
  the 
  occurrence 
  of 
  

   somewhat 
  different 
  forms 
  of 
  life 
  may 
  be 
  merely 
  due 
  to 
  the 
  difference 
  

   of 
  lithological 
  character, 
  as 
  is 
  so 
  well 
  seen 
  in 
  the 
  case 
  of 
  E. 
  e. 
  2 
  in 
  

   Bohemia. 
  Monograptus 
  priodon, 
  recorded 
  by 
  Dr. 
  Linnarsson 
  (Ofv. 
  

   af 
  K. 
  Yet.-Akad. 
  Eorh. 
  1879, 
  no. 
  5) 
  in 
  the 
  Klinte 
  group, 
  would 
  seem, 
  

   as 
  stated 
  by 
  Prof. 
  Lapworth 
  (Geol. 
  Mag. 
  loc. 
  cit.), 
  to 
  bear 
  out 
  this 
  

   view 
  ; 
  for 
  he 
  says 
  that 
  he 
  has 
  never 
  been 
  able 
  to 
  detect 
  any 
  fragment 
  

   of 
  31. 
  priodon 
  in 
  the 
  lower 
  Ludlow 
  rocks. 
  I 
  believe 
  Prof. 
  Lindstrom 
  

   also 
  differs 
  from 
  Sir 
  E. 
  Murchison 
  in 
  his 
  explanation 
  of 
  this 
  section. 
  

  

  Bornliolm. 
  — 
  By 
  the 
  kindness 
  of 
  Prof. 
  Johnstrup, 
  I 
  was 
  enabled 
  to 
  

   examine 
  the 
  collection 
  made 
  by 
  him 
  in 
  this 
  island, 
  and 
  preserved 
  

   in 
  the 
  Copenhagen 
  University 
  Museum. 
  The 
  geology 
  of 
  the 
  island 
  

   has 
  been 
  described 
  by 
  him 
  (Johnstrup, 
  Oversigt 
  over 
  de 
  Pal. 
  

   Dannelser 
  paa 
  Bornholm). 
  The 
  Ceratopyge-limestone 
  and 
  Phyllo- 
  

   graptus-shales 
  are 
  described 
  as 
  missing 
  ; 
  so 
  that 
  there 
  is 
  an 
  over- 
  

   lap, 
  and 
  the 
  Alum-shales 
  are 
  succeeded 
  (apparently 
  conformably) 
  by 
  

   the 
  Orthoceras-limestone. 
  The 
  Trinucleus-shales 
  are 
  noteworthy, 
  

   as 
  they 
  are 
  calcareous 
  ashy 
  beds, 
  much 
  resembling 
  the 
  more 
  shaly 
  

   parts 
  of 
  the 
  Coniston 
  Limestone 
  of 
  England. 
  The 
  Lobiferus-beds 
  

   and 
  Eetiolites-shales 
  are 
  described 
  together, 
  and 
  a 
  mixed 
  list 
  given 
  ; 
  

   but 
  they 
  occur 
  apart. 
  

  

  The 
  Betiolites-beds 
  contain 
  : 
  — 
  

  

  Monograptus 
  priodon, 
  Bronn. 
  

  

  voinerinus, 
  Nick. 
  

  

  spiralis, 
  Gein. 
  

  

  Retiolites 
  Geinitziamis, 
  JBarr. 
  

   Cyrtograptus 
  Murchisoni, 
  Carr. 
  

  

  Aptvchopsis 
  priinurn, 
  Barr. 
  

   Modiolopsis. 
  

   Orthoceras 
  primaevum. 
  

  

  laqueatum 
  ? 
  

  

  subundulatuui. 
  

  

  Geratiocaris 
  Murchisoni 
  ? 
  tenuicinctum. 
  

  

  