﻿1863.] 
  

  

  JENKINS 
  JAVAN 
  FOSSILS. 
  

  

  49 
  

  

  the 
  two 
  valleys, 
  these 
  being 
  differences 
  in 
  stratigraphical 
  detail, 
  caused 
  

   by 
  the 
  volcanic 
  axis 
  of 
  the 
  Javan 
  anticlinal, 
  rather 
  than 
  differences 
  in 
  

   principle. 
  The 
  " 
  form 
  of 
  the 
  ground 
  " 
  in 
  the 
  two 
  cases 
  is 
  also 
  very 
  

   similar 
  ; 
  in 
  both 
  there 
  are 
  two 
  parallel 
  ridges, 
  the 
  outer 
  and 
  natter 
  

   sides 
  of 
  which 
  form 
  a 
  kind 
  of 
  sloping 
  plateau, 
  while 
  the 
  steeper 
  are 
  

   turned 
  towards 
  a 
  central 
  valley 
  having 
  a 
  minor 
  ridge 
  near 
  the 
  centre 
  ; 
  

   but 
  in 
  Java 
  the 
  last-named 
  ridge 
  is 
  much 
  more 
  evident 
  than 
  in 
  the 
  

   Valley 
  of 
  the 
  Weald, 
  as 
  it 
  is 
  composed 
  of 
  an 
  igneous 
  and 
  consequently 
  

   less 
  yielding 
  rock. 
  In 
  the 
  Wealden, 
  however, 
  the 
  strata 
  simply 
  form 
  

   an 
  anticlinal 
  more 
  or 
  less 
  rolling 
  in 
  the 
  centre, 
  and 
  much 
  broken 
  up 
  by 
  

   faults 
  ; 
  but, 
  in 
  Java, 
  the 
  volcanic 
  axis 
  of 
  the 
  anticlinal 
  has 
  thrown 
  

   the 
  strata 
  in 
  its 
  immediate 
  neighbourhood 
  into 
  all 
  sorts 
  of 
  positions. 
  

  

  Fig. 
  1. 
  — 
  Section 
  from 
  the 
  Foot 
  of 
  the 
  Gunung 
  Tjerimai 
  to 
  the 
  Rantaj 
  

   Plateau 
  (after 
  Junghuhn). 
  

  

  Gunung 
  Sela. 
  

  

  G. 
  Sira. 
  G. 
  Tjerimai. 
  

  

  Rantja 
  

   Plateau. 
  

  

  Even 
  allowing 
  for 
  repetition 
  by 
  faults, 
  the 
  thickness 
  of 
  the 
  strata 
  

   in 
  this 
  district 
  must 
  be 
  very 
  great 
  for 
  a 
  Tertiary 
  formation, 
  Mount 
  

   Sela 
  being 
  more 
  than 
  2000 
  feet 
  above 
  the 
  base-line 
  of 
  the 
  section. 
  

   M. 
  Junghuhn 
  considers 
  all 
  the 
  beds 
  in 
  this 
  district 
  as 
  belonging 
  to 
  

   the 
  same 
  formation, 
  and 
  after 
  endeavouring 
  to 
  explain 
  away, 
  in 
  some 
  

   degree, 
  the 
  apparent 
  thickness, 
  he 
  finally 
  computes 
  it 
  to 
  be 
  at 
  least 
  

   10,000 
  Paris 
  feet 
  * 
  ; 
  but 
  this 
  estimate 
  is 
  probably 
  much 
  too 
  great. 
  

  

  Herr 
  von 
  Richthofen 
  speaks 
  of 
  the 
  beds 
  in 
  this 
  district 
  as 
  regu- 
  

   larly 
  superposed 
  upon 
  one 
  another, 
  and 
  having 
  a 
  slight 
  dip. 
  He 
  

   estimates 
  the 
  total 
  thickness 
  of 
  the 
  formation 
  at 
  2000 
  German 
  feet 
  t, 
  

   and 
  describes 
  it 
  as 
  a 
  series 
  of 
  fine-grained 
  marly 
  sandstones 
  and 
  

   sandy 
  marls, 
  passing 
  into 
  and 
  alternating 
  with 
  more 
  or 
  less 
  trachytic 
  

   conglomerates 
  and 
  micaceous 
  marls, 
  the 
  predominating 
  rock 
  being, 
  

   however, 
  the 
  fine-grained 
  sandstone 
  ; 
  he 
  also 
  observes 
  that 
  the 
  whole 
  

   formation 
  is 
  very 
  rich 
  in 
  fossils. 
  

  

  3. 
  Remarks 
  on 
  the 
  new 
  Species. 
  — 
  Before 
  describing 
  the 
  fossils 
  it 
  

   may 
  be 
  as 
  well 
  to 
  follow 
  the 
  example 
  of 
  MM. 
  d'Archiac 
  and 
  Haime 
  +, 
  

   by 
  stating 
  the 
  course 
  adopted 
  in 
  this 
  paper 
  respecting 
  new 
  species, 
  

   especially 
  as 
  the 
  distance 
  of 
  Java 
  from 
  any 
  well-known 
  deposit 
  simi- 
  

   lar 
  to 
  that 
  from 
  which 
  these 
  fossils 
  were 
  derived 
  rendered 
  the 
  task 
  

   somewhat 
  difficult. 
  

  

  Of 
  the 
  twenty-two 
  species 
  of 
  Shells 
  contained 
  in 
  the 
  collection, 
  

   seven 
  are 
  in 
  the 
  state 
  of 
  casts 
  ; 
  of 
  the 
  latter 
  I 
  have 
  attempted 
  to 
  iden- 
  

   tify 
  but 
  one, 
  that 
  being 
  a 
  Cardium 
  represented 
  by 
  many 
  specimens, 
  

  

  * 
  1 
  Paris 
  foot 
  is 
  equal 
  to 
  1-0654 
  English 
  foot, 
  

   t 
  1 
  German 
  foot 
  is 
  equal 
  to 
  1-0284 
  English 
  foot. 
  

   J 
  Eossiles 
  du 
  Groupe 
  Numniulitique 
  de 
  l'lnde, 
  p. 
  231. 
  

   VOL. 
  XX. 
  PART 
  I. 
  E 
  

  

  