﻿Finmarken 
  in 
  Northern 
  Norway. 
  91 
  

  

  in 
  layers 
  or 
  in 
  irregular 
  masses. 
  Nodules 
  of 
  dark 
  

   colored 
  silica 
  are 
  frequently 
  seen, 
  with 
  the 
  characteristic 
  

   appearance 
  of 
  chert. 
  Exceedingly 
  common 
  are 
  intra- 
  

   formational 
  dolomite-conglomerates, 
  the 
  larger 
  frag- 
  

   ments 
  with 
  their 
  edges 
  generally 
  fairly 
  well-rounded. 
  Of 
  

   very 
  great 
  interest 
  also 
  is 
  the 
  occurrence 
  of 
  nicely 
  lamin- 
  

   ated 
  dolomite, 
  restricted 
  to 
  a 
  thickness 
  of 
  several 
  meters. 
  

  

  Fig. 
  3. 
  

  

  '-■ 
  

  

  J^iZL^ 
  

  

  Fig. 
  3. 
  — 
  Vertical 
  and 
  horizontal 
  section 
  through 
  stromatolite 
  material 
  of 
  

   the 
  Gymnosolen 
  type. 
  Natural 
  size. 
  

  

  The 
  laminae 
  are 
  concentrically 
  arranged, 
  sometimes 
  only 
  

   slightly 
  convex, 
  sometimes 
  more 
  so, 
  sometimes 
  with 
  a 
  

   tubular 
  or 
  cylindrical 
  appearance 
  (fig. 
  3). 
  This 
  is 
  the 
  

   Cryptozoon 
  structure 
  of 
  American 
  stratigraphers, 
  and 
  

   will 
  be 
  more 
  fully 
  treated 
  further 
  on. 
  Between 
  such 
  

   laminated 
  layers 
  occur 
  sometimes 
  innumerable 
  small 
  

   oolite-like, 
  irregularly 
  built 
  grains. 
  

  

  