﻿Diastrophism 
  in 
  Atlantic- 
  Arctic 
  Region. 
  23 
  

  

  of 
  northwestern 
  Europe, 
  the 
  transgressions 
  and 
  regres- 
  

   sions 
  seem 
  to 
  appear 
  in 
  totally 
  different 
  ways 
  in 
  the 
  

   different 
  areas. 
  As 
  middle 
  and 
  younger 
  Cambrian 
  times 
  

   are 
  characterized 
  by 
  a 
  vast 
  transgression 
  on 
  the 
  Amer- 
  

   ican 
  continent, 
  both 
  in 
  the 
  south 
  and 
  in 
  the 
  far 
  north, 
  

   the 
  Lower 
  Cambrian 
  sea 
  was 
  laid 
  dry 
  in 
  the 
  Baltic 
  area 
  

   in 
  Middle 
  and 
  Upper 
  Cambrian 
  time. 
  Judging 
  from 
  the 
  

   Scandinavian-Baltic 
  area, 
  it 
  seems 
  that 
  the 
  supposition 
  

   of 
  Haug, 
  that 
  a 
  regression 
  in 
  the 
  geosyncline 
  generally 
  

   corresponds 
  with 
  a 
  transgression 
  in 
  the 
  areas 
  outside 
  of 
  

   the 
  geosyncline, 
  agrees 
  well 
  with 
  the 
  actual 
  conditions, 
  

   at 
  least 
  so 
  far 
  as 
  the 
  area 
  east 
  of 
  the 
  geosyncline 
  is 
  con- 
  

   cerned. 
  This 
  is, 
  in 
  fact, 
  a 
  necessary 
  conclusion 
  to 
  which 
  

   the 
  present 
  author 
  has 
  been 
  led 
  through 
  summarizing 
  the 
  

   geographic 
  features 
  of 
  the 
  northern 
  regions 
  during 
  

   Paleozoic 
  time 
  : 
  that 
  often 
  we 
  note 
  a 
  tvave-like 
  motion 
  

   of 
  the 
  elevated 
  portions 
  of 
  the 
  crust 
  within 
  the 
  region. 
  

   This 
  elevation 
  and 
  sinking 
  may, 
  on 
  the 
  one 
  hand, 
  be 
  due 
  

   to 
  purely 
  vertical 
  movements, 
  as 
  appears 
  to 
  be 
  true 
  in 
  

   the 
  case 
  of 
  the 
  wandering 
  of 
  the 
  shore-lines 
  of 
  the 
  large 
  

   northern 
  continent 
  in 
  Devonian 
  and 
  Carboniferous 
  time, 
  

   and 
  on 
  the 
  other 
  be 
  connected 
  with 
  folding, 
  as 
  in 
  younger 
  

   Silurian 
  time 
  in 
  the 
  region 
  of 
  present 
  southern 
  Norway 
  

   and 
  Scotland. 
  

  

  As 
  to 
  the 
  possible 
  causes 
  of 
  such 
  movements, 
  they 
  do 
  

   not 
  seem 
  to 
  be 
  easily 
  explained 
  by 
  the 
  theory 
  of 
  contrac- 
  

   tion 
  in 
  its 
  more 
  simple 
  form. 
  If 
  the 
  deformed 
  belts 
  

   represent 
  zones 
  of 
  relative 
  "weakness," 
  in 
  the 
  sense 
  

   that 
  they 
  offer 
  little 
  resistance 
  to 
  tangential 
  pressure 
  

   caused 
  by 
  a 
  shrinking 
  globe, 
  we 
  should 
  rather 
  expect 
  the 
  

   deformation 
  to 
  be 
  continually 
  acting 
  in 
  precisely 
  the 
  

   same 
  zone 
  in 
  which 
  deformation 
  was 
  initiated. 
  The 
  

   wave-like 
  motion 
  mentioned 
  certainly 
  suggests 
  another 
  

   explanation 
  that 
  has 
  been 
  given 
  concerning 
  the 
  cause 
  of 
  

   crust 
  deformations, 
  namely, 
  that 
  they 
  are 
  due 
  to 
  move- 
  

   ments 
  of 
  the 
  masses 
  below 
  the 
  crust, 
  magmatic 
  flow 
  in 
  a 
  

   horizontal 
  direction, 
  as 
  suggested 
  by 
  Amferer 
  and 
  

   others. 
  This 
  horizontal 
  flow 
  might 
  be 
  a 
  consequence 
  of 
  

   vertical 
  ones, 
  the 
  possible 
  occurrence 
  of 
  which 
  and 
  the 
  

   importance 
  of 
  which 
  were 
  pointed 
  out 
  by 
  Fisher 
  in 
  this 
  

   Journal 
  in 
  1906. 
  Certainly 
  this 
  possibility 
  of 
  underflow 
  

   (Unterstromung) 
  as 
  a 
  cause 
  of 
  deformation 
  in 
  the 
  crust 
  

   must 
  be 
  taken 
  into 
  consideration 
  when 
  discussing 
  the 
  

   problems 
  as 
  to 
  the 
  nature 
  of 
  these 
  movements. 
  I 
  might 
  

  

  