﻿90 
  0. 
  Holtedahl 
  — 
  Paleozoic 
  Formations 
  of 
  

  

  dips 
  slightly 
  toward 
  the 
  N. 
  N. 
  W., 
  due 
  to 
  the 
  Caledonian 
  

   deformation. 
  In 
  the 
  western 
  part 
  of 
  Finmarken, 
  the 
  

   unaltered 
  Cambrian, 
  having 
  here 
  a 
  thickness 
  of 
  150 
  

   meters, 
  is 
  covered 
  by 
  the 
  metamorphic 
  thrust 
  rocks 
  of 
  

   the 
  West 
  Scandinavian 
  mountain 
  range, 
  just 
  as 
  it 
  is 
  

   further 
  south 
  along 
  the 
  eastern 
  part 
  of 
  this 
  range, 
  while 
  

   to 
  the 
  east 
  we 
  find 
  the 
  practically 
  undisturbed 
  strati- 
  

   graphical 
  sequence 
  ; 
  and 
  here 
  one 
  has 
  the 
  opportunity 
  of 
  

   studying 
  the 
  younger 
  beds, 
  which 
  are 
  of 
  the 
  type 
  not 
  

   known 
  further 
  south, 
  that 
  is, 
  the 
  Finmarken 
  fades. 
  I 
  

   divide 
  this 
  younger 
  series, 
  consisting 
  chiefly 
  of 
  sandstone 
  

   or 
  sandy 
  shales, 
  into 
  two 
  main 
  divisions, 
  an 
  older 
  dolo- 
  

   mite-sandstone 
  series, 
  and 
  a 
  younger 
  sandstone 
  with 
  

   tillites. 
  

  

  Older, 
  Dolomite-bearing 
  Sandstone 
  Division 
  of 
  Finmarhen. 
  

  

  Resting 
  apparently 
  conformably 
  upon 
  the 
  Lower 
  Cam- 
  

   brian 
  series 
  is 
  a 
  compact, 
  very 
  light-colored 
  sandstone, 
  

   consisting 
  chiefly 
  of 
  quartz, 
  yet 
  with 
  some 
  grains 
  of 
  feld- 
  

   spar 
  which 
  are 
  changed 
  into 
  kaolin. 
  This 
  rock 
  belongs 
  

   to 
  a 
  very 
  thick 
  sandstone 
  series, 
  which 
  I 
  have 
  named 
  the 
  

   Porsanger 
  sandstone, 
  as 
  it 
  is 
  well 
  seen 
  at 
  the 
  inner 
  por- 
  

   tion 
  of 
  the 
  Porsangerfjord. 
  The 
  total 
  thickness 
  is 
  at 
  

   least 
  500 
  meters 
  and 
  probably 
  more. 
  Not 
  all 
  of 
  this 
  

   thickness 
  is, 
  however, 
  compact 
  sandstone, 
  for 
  especially 
  

   in 
  one 
  horizon 
  (probably 
  300 
  to 
  400 
  meters 
  above 
  the 
  

   base) 
  occur 
  thinner 
  bedded 
  and 
  darker 
  sandstones, 
  

   together 
  with 
  dark 
  grey 
  sandy 
  shale. 
  The 
  surfaces 
  of 
  

   the 
  thin-bedded 
  sandstones 
  have, 
  through 
  a 
  thickness 
  of 
  

   many 
  meters, 
  exceedingly 
  fine 
  interference 
  ripple-marks. 
  5 
  

  

  In 
  the 
  upper 
  part 
  of 
  the 
  Porsanger 
  series 
  occur 
  inter- 
  

   bedded 
  thick 
  zones 
  of 
  sandy, 
  often 
  reddish 
  brown 
  shale, 
  

   and 
  finally 
  the 
  series 
  is 
  terminated 
  by 
  a 
  reddish 
  brown 
  

   and 
  green 
  shale 
  zone, 
  with 
  only 
  thin 
  beds 
  of 
  sandstone, 
  

   having 
  a 
  thickness 
  of 
  from 
  50 
  to 
  100 
  meters. 
  Above 
  this 
  

   shale 
  comes 
  the 
  Porsanger 
  dolomite, 
  a 
  compact, 
  light- 
  

   colored 
  dolomite 
  that 
  weathers 
  whitish 
  as 
  a 
  rule. 
  The 
  

   thickness 
  of 
  this 
  dolomite 
  is 
  difficult 
  to 
  fix, 
  due 
  to 
  tectonic 
  

   deformations 
  which 
  have 
  strongly 
  folded 
  it 
  and 
  in 
  places 
  

   thinned 
  it 
  considerably. 
  I 
  consider 
  the 
  thickness, 
  how- 
  

   ever, 
  to 
  have 
  been 
  at 
  least 
  100 
  meters. 
  

  

  This 
  dolomite 
  shows 
  many 
  interesting 
  features. 
  Some 
  

   of 
  the 
  zones 
  are 
  much 
  silicified, 
  with 
  fine-grained 
  quartz 
  

  

  "Compare 
  Kindle, 
  Geol. 
  Survey 
  Canada, 
  Mus. 
  Bull. 
  25, 
  1917. 
  

  

  