﻿APR. 
  4, 
  1922 
  BROUWER 
  : 
  TECTONIC 
  FEATURES 
  DUTCH 
  EAST 
  INDIES 
  179 
  

  

  which 
  were 
  moved 
  in 
  the 
  near-surface 
  zone 
  where 
  the 
  rocks 
  yielded 
  to 
  

   pressure 
  not 
  by 
  flow 
  but 
  mostly 
  by 
  fracture. 
  The 
  comparative 
  method 
  

   of 
  study 
  leads 
  to 
  the 
  supposition 
  that 
  on 
  Timor 
  the 
  deeper 
  complicated, 
  

   but 
  less 
  chaotic 
  overthrust 
  structures, 
  such 
  as 
  are 
  found 
  in 
  the 
  Western 
  

   Alps, 
  have 
  not 
  here 
  been 
  uncovered 
  by 
  erosion, 
  and 
  the 
  absence 
  of 
  

   rocks 
  older 
  than 
  those 
  of 
  Permian 
  age 
  points 
  to 
  the 
  same 
  conclusion. 
  

   Simpler 
  structures 
  are 
  found 
  only 
  in 
  the 
  southern 
  coast-range 
  of 
  the 
  

   island, 
  where 
  an 
  imbricated 
  structure 
  with 
  a 
  fairly 
  uniform 
  dip 
  to 
  the 
  

   north-northwest 
  prevails. 
  On 
  Babber, 
  an 
  island 
  to 
  the 
  east 
  of 
  Timor, 
  

   crinoidal 
  Hmestone 
  has 
  been 
  found 
  as 
  isolated 
  "fatus," 
  which 
  rest 
  on 
  

   folded 
  Jurassic 
  sediments. 
  In 
  the 
  eastern 
  part 
  of 
  Ceram 
  Triassic 
  

   sediments 
  are 
  thrust 
  over 
  limestones 
  and 
  marls, 
  which 
  are 
  partly 
  of 
  late 
  

   Mesozoic 
  age 
  and 
  which 
  show 
  a 
  rather 
  regular 
  dip 
  to 
  the 
  southwest. 
  

   In 
  the 
  central 
  and 
  western 
  part 
  of 
  the 
  island 
  several 
  remarkable 
  suc- 
  

   cessions 
  of 
  crystalline 
  schists, 
  phyllitic 
  slates, 
  and 
  Mesozoic 
  rocks 
  point 
  

   to 
  the 
  existence 
  of 
  important 
  overthrusts 
  between 
  these 
  three 
  forma- 
  

   tions. 
  In 
  the 
  western 
  part 
  of 
  the 
  island 
  the 
  horizontal 
  movement 
  of 
  

   the 
  overthrust 
  seems 
  to 
  be 
  less 
  than 
  that 
  on 
  the 
  southern 
  islands 
  of 
  the 
  

   Timor-Ceram 
  row, 
  because 
  groups 
  of 
  deposits 
  of 
  the 
  same 
  age, 
  but 
  of 
  

   different 
  paleontological 
  and 
  petrographical 
  character, 
  are 
  not 
  found 
  

   one 
  on 
  top 
  of 
  the 
  other 
  and 
  in 
  close 
  proximity 
  in 
  the 
  same 
  degrees 
  as 
  on 
  

   Timor. 
  

  

  The 
  expeditions 
  from 
  the 
  south 
  coast 
  to 
  the 
  Snow 
  Mountains 
  of 
  

   the 
  central 
  range 
  of 
  New 
  Guinea 
  found 
  strata 
  with 
  a 
  fairly 
  uniform 
  dip 
  

   to 
  the 
  north 
  over 
  long 
  distances 
  and 
  it 
  does 
  not 
  seem 
  improbable, 
  that 
  

   recumbent 
  folds, 
  imbricated 
  structures, 
  or 
  overthrusts, 
  with 
  a 
  move- 
  

   ment 
  in 
  the 
  direction 
  of 
  the 
  Australian 
  continent 
  may 
  occur 
  in 
  these 
  

   mountains. 
  This 
  chain 
  bears 
  towards 
  the 
  lowland 
  to 
  the 
  south 
  and 
  to 
  

   Australia 
  beyond 
  a 
  relation 
  somewhat 
  similar 
  to 
  that 
  borne 
  by 
  the 
  

   Himalayas 
  towards 
  India. 
  

  

  REGIONS 
  WITH 
  SIMPLER 
  STRUCTURES 
  

  

  In 
  Sumatra 
  the 
  overthrusts 
  are 
  older 
  than 
  Tertiary, 
  in 
  Timor 
  

   they 
  were 
  formed 
  in 
  Miocene 
  time. 
  The 
  Tertiary 
  rocks 
  of 
  Sumatra 
  up 
  

   to 
  the 
  Pliocene 
  generally 
  have 
  been 
  folded, 
  often 
  in 
  more 
  or 
  less 
  regular 
  

   broad 
  anticlines 
  and 
  synclines, 
  such 
  as 
  those 
  of 
  the 
  oil-bearing 
  strata 
  

   in 
  the 
  eastern 
  part 
  of 
  the 
  island. 
  Similar 
  relations 
  prevail 
  in 
  other 
  

   regions 
  where 
  in 
  Neogene 
  time 
  there 
  were" 
  geosynclinal 
  belts 
  per- 
  

   sistently 
  and 
  fairly 
  well 
  filled 
  with 
  an 
  accumulation 
  of 
  sediments, 
  as 
  in 
  

   parts 
  of 
  Java 
  and 
  Borneo 
  and 
  also 
  on 
  some 
  islands 
  in 
  the 
  eastern 
  part 
  of 
  

  

  