﻿ISO 
  JOURNAL 
  OF 
  the; 
  WASHINGTON 
  ACADEMY 
  OF 
  SCIENCES 
  VOL. 
  12, 
  NO. 
  7 
  

  

  the 
  Archipelago. 
  In 
  some 
  parts 
  of 
  the 
  Archipelago 
  the 
  Mesozoic 
  and 
  

   Tertiary 
  rocks 
  both 
  show 
  simpler 
  structures. 
  In 
  western 
  New 
  Guinea 
  to 
  

   the 
  south 
  of 
  the 
  Gulf 
  of 
  the 
  Mac 
  Cluer 
  normally 
  folded 
  Tertiary 
  rocks 
  

   occur, 
  and 
  farther 
  west, 
  in 
  the 
  Misol-Obi-Sula 
  row 
  of 
  islands 
  in 
  places 
  

   the 
  Jurassic 
  strata 
  are 
  but 
  slightly 
  folded 
  or 
  are 
  nearly 
  horizontal. 
  

   On 
  Borneo 
  crustal 
  deformation 
  of 
  the 
  late 
  Mesozoic 
  stage 
  is 
  clearly 
  

   visible, 
  but 
  at 
  many 
  places 
  the 
  dip 
  of 
  the 
  Cretaceous 
  strata 
  is 
  not 
  very 
  

   pronounced. 
  The 
  tectonic 
  structure 
  may 
  be 
  more 
  complicated 
  in 
  the 
  

   northeastern 
  part 
  of 
  the 
  island, 
  where 
  the 
  folded 
  ranges 
  are 
  closely 
  

   crowded 
  together. 
  Sumba, 
  is 
  usually 
  considered 
  as 
  the 
  western 
  

   prolongation 
  of 
  the 
  Timor 
  row 
  of 
  islands, 
  but 
  the 
  Tertiary 
  is 
  not 
  dis- 
  

   tinctly 
  folded. 
  

  

  On 
  Celebes 
  the 
  ages 
  of 
  the 
  dififerent 
  strata 
  are 
  not 
  yet 
  exactly 
  

   known. 
  It 
  has 
  been 
  supposed 
  that 
  even 
  Tertiary 
  sediments 
  occur 
  

   amongst 
  the 
  metamorphic 
  sediments, 
  which 
  are 
  of 
  widespread 
  occur- 
  

   rence 
  on 
  the 
  island, 
  but 
  as 
  yet 
  there 
  is 
  no 
  proof 
  of 
  this 
  supposition. 
  

   In 
  the 
  central 
  part 
  of 
  the 
  island 
  large 
  anticlines 
  and 
  synclines 
  with 
  an 
  

   approximately 
  northwest-southeast 
  strike 
  were 
  formed 
  in 
  post 
  Eocene 
  

   time. 
  In 
  the 
  eastern 
  peninsula 
  nearly 
  horizontal 
  Eocene 
  limestones 
  

   occur, 
  but 
  at 
  other 
  places, 
  as 
  in 
  the 
  western 
  part 
  of 
  the 
  eastern 
  

   peninsula, 
  rocks 
  of 
  the 
  same 
  age 
  are 
  intensely 
  folded. 
  Although 
  sim- 
  

   pler 
  structures 
  with 
  large 
  anticlines 
  and 
  synclines 
  certainly 
  prevail 
  in 
  a 
  

   large 
  part 
  of 
  the 
  island, 
  we 
  cannot 
  gain 
  an 
  adequate 
  picture 
  of 
  the 
  late 
  

   Mesozoic 
  and 
  Tertiary 
  tectonic 
  features 
  of 
  the 
  whole 
  island 
  until 
  the 
  

   stratigraphy 
  is 
  more 
  completely 
  known. 
  

  

  THE 
  MAIN 
  TREND 
  LINES 
  OF 
  THE 
  YOUNGEST 
  STAGE 
  OF 
  MOUNTAIN-BUILDING 
  

  

  The 
  main 
  trend 
  lines 
  of 
  the 
  latest 
  stage 
  of 
  mountain-making 
  are 
  

   accurately 
  known, 
  because 
  uplifts 
  of 
  the 
  land 
  relatively 
  to 
  the 
  sea 
  

   level 
  are 
  clearly 
  demonstrated 
  by 
  the 
  presence 
  of 
  elevated 
  fringing 
  reefs 
  

   and 
  because 
  the 
  positions 
  of 
  the 
  deep-sea 
  basins 
  are 
  given 
  on 
  the 
  deep- 
  

   sea 
  chart 
  of 
  the 
  "Siboga" 
  expedition. 
  The 
  deep-sea 
  basins 
  have 
  

   proved 
  to 
  be 
  elongated 
  more 
  or 
  less 
  precisely 
  parallel 
  to 
  the 
  adjoining 
  

   rows 
  of 
  islands 
  and 
  the 
  main 
  trend 
  lines 
  of 
  the 
  youngest 
  stage 
  of 
  moun- 
  

   tain-building 
  nearly 
  coincide 
  with 
  the 
  longer 
  axes 
  of 
  the 
  islands. 
  The 
  

   deep 
  sea 
  basins 
  and 
  the 
  strongly 
  elevated 
  islands 
  are 
  confined 
  to 
  the 
  

   eastern 
  part 
  of 
  the 
  Archipelago, 
  whereas 
  within 
  the 
  western 
  area 
  there 
  

   prevails 
  a 
  slight 
  and 
  uniform 
  depth 
  of 
  the 
  sea 
  with 
  smooth 
  outlines 
  of 
  a 
  

   land 
  that 
  rises 
  with 
  a 
  gentle 
  slope 
  from 
  the 
  coast. 
  Only 
  the 
  southern 
  

   part 
  of 
  the 
  Archipelago 
  which 
  is 
  bounded 
  by 
  the 
  Indian 
  Ocean, 
  shows 
  

  

  