﻿Finmarhen 
  in 
  Northern 
  Norway. 
  99 
  

  

  elsewhere. 
  This 
  is 
  the 
  extremely 
  well-marked 
  transgres- 
  

   sion 
  at 
  the 
  very 
  boundary 
  between 
  the 
  Cambrian 
  and 
  

   Ordovician. 
  The 
  Bictyograptus 
  shale 
  and 
  correspond- 
  

   ing 
  sediments 
  overlap 
  in 
  different 
  areas 
  upon 
  various 
  

   older 
  strata 
  ; 
  in 
  Dalarne 
  in 
  central 
  Sweden 
  the 
  transgres- 
  

   sion 
  is 
  over 
  pre-Cambrian 
  rocks, 
  in 
  Oeland 
  over 
  Middle 
  

   Cambrian, 
  in 
  Estland 
  over 
  Lower 
  Cambrian. 
  We 
  have 
  

   in 
  this 
  fact 
  a 
  strong 
  indication 
  of 
  the 
  probable 
  age 
  of 
  the 
  

   Porsanger 
  series. 
  If 
  we 
  assume 
  it 
  to 
  be 
  basal 
  Ordovi- 
  

   cian, 
  we 
  have 
  here, 
  in 
  a 
  relatively 
  eastern 
  part 
  of 
  

   northern 
  Fennoskandia, 
  exactly 
  the 
  same 
  stratigraphical 
  

   succession 
  as 
  that 
  of 
  the 
  eastern 
  part 
  of 
  south 
  Fenno- 
  

   skandia, 
  in 
  Estland, 
  where 
  the 
  "Unguliten 
  sand" 
  lies 
  

   upon 
  Lower 
  Cambrian 
  clay 
  and 
  sand 
  which 
  has, 
  among 
  

   other 
  fossils, 
  Platys 
  olenites. 
  The 
  elevation 
  of 
  the 
  

   northern 
  land 
  which 
  has 
  given 
  rise 
  to 
  the 
  enormous 
  sand- 
  

   stone 
  masses 
  of 
  Finmarken 
  may, 
  in 
  fact, 
  have 
  been 
  one 
  

   of 
  the 
  causes 
  of 
  the 
  early 
  Ordovician 
  transgression. 
  

  

  It 
  is 
  furthermore 
  of 
  considerable 
  interest 
  in 
  correla- 
  

   tion 
  to 
  note 
  that 
  even 
  if 
  the 
  stromatolites 
  can 
  not 
  be 
  

   considered 
  as 
  actual 
  fossils, 
  they 
  represent 
  a 
  very 
  char- 
  

   acteristic 
  type 
  of 
  rock 
  which 
  in 
  various 
  regions 
  seems 
  to 
  

   be 
  nearly 
  as 
  good 
  as 
  guide 
  fossils 
  ; 
  for 
  instance, 
  the 
  

   widely 
  distributed 
  cryptozoons 
  of 
  North 
  America, 
  which 
  

   are 
  exceedingly 
  typical 
  for 
  the 
  limestone-dolomite 
  facie 
  s 
  

   of 
  the 
  Cambro-Ordovician 
  transition 
  zone 
  and 
  the 
  basal 
  

   Ordovician, 
  the 
  Ozarkian 
  and 
  Canadian 
  of 
  American 
  

   stratigraphers. 
  Another 
  interesting 
  fact 
  is 
  that 
  I 
  have 
  

   seen 
  the 
  Cryptozoon 
  structure 
  in 
  limestone 
  of 
  Ozarkian 
  

   age, 
  collected 
  by 
  the 
  Second 
  Arctic 
  Norwegian 
  Expedi- 
  

   tion 
  in 
  the 
  "Fram" 
  on 
  the 
  south 
  coast 
  of 
  Ellesmere- 
  

   land. 
  15 
  What 
  without 
  doubt 
  is 
  a 
  stromatolitic 
  structure 
  

   is 
  further 
  mentioned 
  from 
  a 
  sedimentary 
  series, 
  contain- 
  

   ing 
  dolomite, 
  limestone, 
  sandstones 
  and 
  shales 
  of 
  Cam- 
  

   bro- 
  Silurian 
  age, 
  occurring 
  in 
  northeastern 
  Greenland. 
  16 
  

   In 
  fact, 
  a 
  few 
  fragmentary 
  fossils 
  found 
  here 
  — 
  Nathorst 
  

   mentions 
  orthocerids, 
  a 
  small 
  Orthis, 
  small 
  gastropods 
  — 
  

   may 
  very 
  well 
  belong 
  to 
  a 
  low 
  Ordovician 
  zone. 
  

  

  Stromatolites 
  also 
  occur 
  in 
  dolomite 
  in 
  the 
  so-called 
  

   Heclahook 
  system 
  of 
  Spitzbergen, 
  and 
  even 
  though 
  no 
  

  

  15 
  Holtedahl, 
  O., 
  Summary 
  of 
  geological 
  results, 
  No. 
  36 
  of 
  Kept. 
  Second 
  

   Norweg. 
  Arctic 
  Exped., 
  "Fram," 
  Kristiania, 
  1917. 
  

  

  16 
  Nathorst, 
  A. 
  G., 
  Bidrag 
  till 
  Nordostra 
  Gronlands 
  geologi, 
  Geol. 
  Foren 
  

   Stockholm 
  Forh., 
  23, 
  1901. 
  

  

  