﻿OF 
  THE 
  BALTIC 
  PROVINCES 
  OF 
  RUSSIA. 
  

  

  535 
  

  

  ■ 
  

  

  B. 
  

  

  0. 
  

  

  D. 
  

  

  E. 
  

  

  F.|G. 
  

  

  H. 
  

  

  I. 
  

  

  K. 
  

  

  Abroad. 
  

  

  2 
  

  

  3 
  

  

  1 
  

  

  2 
  

  

  3 
  

  

  

  

  54. 
  C. 
  affinis, 
  mi 
  hi 
  

  

  

  

  # 
  

  

  

  

  * 
  

  

  * 
  

   * 
  

  

  # 
  

  

  

  

  

  

  Sweden 
  (Dalarne). 
  

  

  Gothland. 
  

  

  England, 
  America, 
  

  

  Sweden, 
  Norway, 
  Po- 
  

  

  dolia. 
  

   Iceland, 
  erratics 
  in 
  N. 
  

  

  Germany. 
  

  

  

  

  

  

  

  

  

  

  

  Genus 
  Encrinurus, 
  Emmr. 
  

  

  

  

  

  

  

  

  

  

  

  -x- 
  

  

  

  

  

  

  

  

  

  

  

  * 
  

  

  x 
  

  

  * 
  

  

  

  

  

  

  

  

  

  

  * 
  

  

  3 
  

   10 
  

  

  60 
  E 
  Seebachi, 
  mihi 
  

  

  

  

  

  

  

  

  3 
  

   6 
  

  

  1 
  

  

  2 
  

  

  1 
  

   2 
  

  

  1 
  

   1 
  

  

  2 
  

   3 
  

  

  

  1 
  

  

  4 
  

  

  1 
  

   10 
  

  

  4 
  

  

  2< 
  

  

  3 
  

   12 
  

  

  1 
  

   6 
  

  

  2 
  

  

  13 
  

  

  Next 
  follows 
  the 
  genus 
  Lichas, 
  

   of 
  which 
  22 
  species 
  are 
  already 
  

   determined 
  and 
  drawn. 
  

  

  EXPLANATION 
  OP 
  PLATE 
  XXIII. 
  

  

  Fig. 
  1. 
  Sketch 
  Map 
  of 
  the 
  Silurian 
  (and 
  Cambrian) 
  Strata 
  in 
  the 
  Eastern 
  Baltic 
  

   Provinces 
  of 
  Russia, 
  St. 
  Petersburg, 
  Ingermanland, 
  Esthonia, 
  Li- 
  

   vonia, 
  and 
  the 
  Island 
  of 
  Oesel. 
  

  

  2. 
  Section 
  through 
  the 
  Western 
  Coast-region 
  of 
  Esthonia, 
  from 
  Werder 
  

  

  to 
  Odensholra. 
  

  

  3. 
  Section 
  from 
  Malla 
  and 
  Kunda 
  in 
  Esthonia, 
  on 
  the 
  Gulf 
  of 
  Finland, 
  to 
  

  

  Talkhof, 
  in 
  Livonia. 
  (From 
  Prof. 
  Grewingk's 
  Geological 
  Map 
  of 
  

   Esthonia, 
  Livonia, 
  and 
  Courland.) 
  

  

  Discussion. 
  

  

  Prof. 
  Hughes 
  could 
  not 
  understand 
  why 
  the 
  author 
  should 
  regard 
  

   the 
  whole 
  as 
  forming 
  a 
  continuous 
  series, 
  when 
  he 
  admitted 
  a 
  palse- 
  

   ontological 
  break 
  at 
  the 
  top 
  of 
  Sedgwick's 
  Cambrian, 
  and 
  the 
  con- 
  

   formity 
  might 
  be 
  local 
  or 
  accidental, 
  as 
  was 
  commonly 
  the 
  case 
  in 
  

   this 
  country. 
  

  

  Mr. 
  Mark 
  pointed 
  out 
  that 
  the 
  uppermost 
  bed 
  of 
  group 
  F 
  had 
  a 
  

   fauna 
  similar 
  to 
  that 
  of 
  the 
  lower 
  part 
  of 
  the 
  Brachiopod 
  shales 
  of 
  

   Sweden, 
  and 
  that 
  certain 
  blue 
  shales 
  of 
  this 
  series 
  are 
  not 
  repre- 
  

   sented 
  in 
  Russia 
  ; 
  consequently 
  not 
  only 
  is 
  there 
  a 
  palaeontological 
  

   break 
  at 
  this 
  horizon, 
  but 
  also 
  deposits 
  found 
  elsewhere 
  are 
  absent. 
  

   The 
  beds 
  of 
  group 
  G 
  are 
  correlated 
  with 
  the 
  May-Hill 
  beds, 
  and 
  

   represent 
  both 
  the 
  upper 
  and 
  lower 
  divisions. 
  In 
  Russia, 
  therefore, 
  

   as 
  in 
  other 
  areas, 
  there 
  is 
  a 
  break 
  at 
  the 
  base 
  of 
  the 
  May-Hill 
  

   group. 
  The 
  line 
  which 
  the 
  author 
  draws 
  between 
  Primordial 
  and 
  

   Lower 
  Silurian 
  is 
  drawn 
  at 
  the 
  base 
  of 
  beds 
  which 
  he 
  correlates 
  

   with 
  the 
  Ceratoj>yge-limestone, 
  the 
  equivalent 
  of 
  the 
  Tremadoc 
  

  

  