﻿Diastrophism 
  in 
  Atlantic- 
  Arctic 
  Region. 
  15 
  

  

  there 
  have 
  been 
  several 
  periods 
  of 
  local 
  uplift 
  and 
  strong 
  

   denudation 
  during 
  Carboniferous 
  time. 
  

  

  The 
  invasion 
  of 
  the 
  Arctic 
  sea 
  southward 
  on 
  the 
  pene- 
  

   plained 
  northern 
  coastal 
  district 
  of 
  the 
  large 
  continent 
  

   of 
  Eria 
  took 
  place 
  in 
  Middle 
  Carboniferous 
  time, 
  or, 
  

   according 
  to 
  the 
  Russian 
  stratigraphic 
  standard, 
  in 
  the 
  

   Moscovian. 
  In 
  Spitzbergen, 
  only 
  a 
  few 
  meters 
  of 
  con- 
  

   glomerate 
  separate 
  the 
  invading 
  base 
  from 
  the 
  higher 
  

   limestones 
  where 
  the 
  reef 
  -building 
  corals 
  are 
  a 
  dominant 
  

   element, 
  while 
  in 
  the 
  southern 
  island 
  the 
  limestone 
  depo- 
  

   sition 
  is 
  preceded 
  by 
  a 
  very 
  considerable 
  thickness 
  of 
  

   sometimes 
  rather 
  coarse 
  conglomeratic 
  beds. 
  

  

  It 
  is 
  a 
  fact 
  of 
  considerable 
  interest 
  that 
  the 
  invasion 
  of 
  

   the 
  sea 
  in 
  the 
  north 
  must 
  have 
  been 
  more 
  or 
  less 
  con- 
  

   temporaneous 
  with 
  the 
  important 
  regression 
  in 
  the 
  

   south. 
  This 
  is 
  but 
  another 
  indication 
  of 
  the 
  wave-like 
  

   movement 
  of 
  the 
  large 
  positive 
  area 
  of 
  the 
  crust, 
  men- 
  

   tioned 
  here 
  as 
  the 
  North 
  Atlantic 
  continent. 
  

  

  We 
  shall 
  not 
  here 
  treat 
  of 
  the 
  great 
  orogenic 
  move- 
  

   ments 
  of 
  Carboniferous 
  (Mississippian-Pennsylvanian) 
  

   time 
  occurring 
  in 
  areas 
  partly 
  represented 
  in 
  the 
  maps 
  

   (some 
  of 
  these 
  movements 
  are, 
  however, 
  noted 
  in 
  the 
  

   accompanying 
  table), 
  nor 
  shall 
  we 
  deal 
  with 
  the 
  geo- 
  

   graphical 
  conditions 
  of 
  Permian 
  time, 
  as 
  we 
  know 
  very 
  

   little 
  about 
  this 
  chapter 
  of 
  geological 
  history 
  as 
  far 
  as 
  

   the 
  Arctic 
  regions 
  are 
  concerned. 
  

  

  Discussion 
  of 
  the 
  Diastrophism 
  and 
  the 
  Geosynclines. 
  

  

  For 
  American 
  geologists, 
  the 
  older 
  Paleozoic 
  history 
  

   of 
  the 
  region 
  that 
  has 
  been 
  especially 
  treated 
  on 
  the 
  pre- 
  

   ceding 
  pages, 
  that 
  is, 
  northwestern 
  Europe 
  with 
  the 
  

   Arctic 
  districts 
  farther 
  north, 
  may 
  be 
  of 
  considerable 
  

   interest, 
  as 
  we 
  are 
  in 
  fact 
  dealing 
  with 
  parts 
  of 
  the 
  

   earth's 
  surface 
  that 
  geologically 
  may 
  be 
  designated 
  as 
  a 
  

   direct 
  continuation 
  of 
  the 
  eastern 
  part 
  of 
  their 
  continent. 
  

   By 
  the 
  demonstration 
  of 
  the 
  American 
  character 
  of 
  the 
  

   sediments 
  deposited 
  in 
  the 
  greater 
  part 
  of 
  the 
  extensive 
  

   and 
  now 
  folded 
  northwest 
  European 
  geosyncline 
  which 
  

   extends 
  beyond 
  Spitzbergen 
  and 
  thence 
  into 
  Arctic 
  North 
  

   America, 
  and 
  of 
  the 
  probable 
  existence 
  of 
  a 
  barrier, 
  on 
  

   the 
  southeastern 
  side 
  of 
  which 
  were, 
  at 
  one 
  time, 
  depos- 
  

   ited 
  the 
  same 
  types 
  of 
  sediments 
  and 
  fossils 
  as 
  occur 
  in 
  

   the 
  Acadian 
  area 
  of 
  North 
  America, 
  we 
  see 
  repeated 
  

  

  