﻿106 
  0. 
  Holtedahl 
  — 
  Paleozoic 
  Formations 
  of 
  

  

  As 
  to 
  the 
  very 
  important 
  question 
  of 
  the 
  age 
  of 
  this 
  

   younger 
  tillite-bearing 
  sandstone 
  of 
  Finmarken, 
  it 
  is 
  still 
  

   very 
  difficult 
  to 
  give 
  any 
  exact 
  information, 
  as 
  no 
  fossils 
  

   are 
  found. 
  If 
  my 
  interpretation 
  of 
  the 
  age 
  of 
  the 
  older 
  

   division 
  is 
  correct, 
  it 
  must 
  be 
  placed 
  somewhere 
  between 
  

   the 
  Lower 
  Ordovician 
  and 
  the 
  higher 
  Silurian. 
  It 
  is 
  dis- 
  

   tinctly 
  older 
  than 
  the 
  Caledonian 
  deformation, 
  because 
  in 
  

   places 
  the 
  rocks 
  are 
  highly 
  folded, 
  and 
  in 
  western 
  Fin- 
  

  

  Fig. 
  10. 
  

  

  Fig. 
  10. 
  — 
  Glaciated 
  quartzite 
  bowlder, 
  from 
  the 
  tillite 
  at 
  the 
  inner 
  end 
  

   of 
  the 
  Altenfjord. 
  Entire 
  surface 
  also 
  with 
  fine 
  slickensided 
  strata 
  due 
  to 
  

   the 
  Caledonian 
  deformation. 
  One 
  half 
  natural 
  size. 
  

  

  marken 
  they 
  are 
  overlain 
  by 
  thrusted 
  mylonitic 
  rocks. 
  

   The 
  most 
  probable 
  supposition 
  is, 
  in 
  the 
  writer's 
  opinion, 
  

   that 
  the 
  time 
  is 
  of 
  Middle 
  or 
  possibly 
  Upper 
  Ordovician 
  

   age. 
  

  

  The 
  investigations 
  of 
  Wiman 
  in 
  Jemtland, 
  Sweden, 
  

   have 
  shown 
  that 
  a 
  dislocation 
  there 
  preceded 
  the 
  deposi- 
  

   tion 
  of 
  the 
  Orthoceras 
  limestone, 
  which 
  in 
  places 
  rests 
  on 
  

   the 
  pre-Cambrian 
  and 
  whose 
  conglomeratic 
  basal 
  layers 
  

   contain 
  pieces 
  of 
  Cambrian 
  shales. 
  This 
  deformation 
  of 
  

   the 
  crust 
  might 
  have 
  been 
  contemporaneous 
  with 
  the 
  one 
  

   preceding 
  the 
  deposition 
  of 
  the 
  tillite-bearing 
  division 
  of 
  

   Finmarken. 
  In 
  parts 
  of 
  Jemtland 
  we 
  find, 
  furthermore, 
  

   thick 
  series 
  of 
  quartzites 
  that 
  are 
  in 
  part 
  probably 
  of 
  

   Middle 
  and 
  Upper 
  Ordovician 
  age, 
  and 
  that 
  may 
  have 
  

   been 
  derived 
  from 
  a 
  land-mass 
  which 
  then 
  lay 
  to 
  the 
  

   northwest 
  and 
  which 
  may 
  have 
  continued 
  northward 
  into 
  

   the 
  southern 
  pari 
  of 
  Finmarken 
  and 
  the 
  Kola 
  Peninsula. 
  

  

  In 
  the 
  Trondhjcm 
  district 
  of 
  central 
  Norway 
  occurs 
  the 
  

   so 
  called 
  llovind 
  group, 
  in 
  which 
  are 
  found 
  fossils 
  of 
  

   Upper 
  Ordovician 
  age; 
  this 
  is 
  a 
  series 
  characterized 
  to 
  a 
  

  

  