﻿TRAP. 
  19 
  

  

  and 
  agglomerates, 
  occurring 
  in 
  many 
  places 
  at 
  the 
  base 
  of 
  the 
  bedded 
  

   traps, 
  are 
  probably 
  about 
  the 
  same 
  date 
  as 
  the 
  trappean 
  grits. 
  They 
  

   not 
  unfrequently 
  occupy 
  hollows, 
  or 
  depressions, 
  in 
  the 
  sandstone 
  floor 
  

   on 
  which 
  the 
  traps 
  are 
  superimposed. 
  In 
  the 
  vicinity 
  of 
  the 
  village 
  

   of 
  Mewasa, 
  ten 
  miles 
  south 
  of 
  Chotila, 
  various 
  rocks 
  — 
  ashes, 
  felsites, 
  

   &c. 
  — 
  are 
  seen 
  filling 
  irregular 
  hollows 
  of 
  the 
  Umia 
  sandstones 
  near 
  the 
  

   scarped 
  margin 
  of 
  the 
  trap 
  area. 
  

  

  Some 
  of 
  the 
  earthy 
  felsitic 
  rock, 
  which 
  is 
  mostly 
  in 
  a 
  decomposed 
  

   state, 
  is 
  porphyritic 
  with 
  a 
  white 
  and 
  pale-green 
  soapy 
  mineral 
  ; 
  other 
  

   parts 
  have 
  a 
  brecciated, 
  or 
  agglomeratic 
  appearance. 
  

  

  Traps. 
  — 
  In 
  the 
  foregoing 
  section, 
  I 
  have 
  treated 
  mainly 
  of 
  the 
  

   miscellaneous 
  volcanic 
  accumulations 
  belonging 
  to 
  the 
  inception 
  of 
  

   the 
  great 
  Deccan 
  trap 
  period 
  ; 
  in 
  the 
  present 
  section, 
  we 
  have 
  to 
  deal 
  

   with 
  the 
  bedded 
  trap 
  -flows. 
  The 
  trap 
  formation 
  in 
  Kathiawar 
  — 
  un- 
  

   questionably 
  an 
  extension 
  of 
  that 
  in 
  Cutch 
  on 
  the 
  

   Bedded 
  traps. 
  

  

  one 
  hand, 
  and 
  of 
  those 
  in 
  Guzerat 
  and 
  Malwa 
  on 
  

  

  the 
  other 
  — 
  stretches 
  from 
  the 
  east 
  coast 
  at 
  a 
  point 
  below 
  Gogha, 
  to 
  the 
  

   western 
  shore, 
  where 
  it 
  sinks 
  below 
  the 
  Gulf 
  of 
  Cutch. 
  It 
  prevails 
  

   to 
  within 
  a 
  few 
  miles 
  of 
  the 
  southern 
  coast, 
  where 
  it 
  is 
  overlapped, 
  by 
  

   tertiary 
  and 
  post-tertiary 
  deposits. 
  North 
  of 
  Bhavnagar 
  it 
  is 
  covered 
  

   by 
  alluvium. 
  In 
  the 
  northern 
  division 
  of 
  the 
  province, 
  the 
  bedded 
  traps 
  

   have 
  been 
  so 
  much 
  denuded 
  as 
  to 
  expose 
  the 
  underlying 
  formations 
  

   already 
  described. 
  

  

  The 
  accumulative 
  thickness 
  of 
  volcanic 
  rock 
  in 
  the 
  Girnar 
  mountain 
  

   cannot 
  be 
  less 
  than 
  3,500 
  feet, 
  but 
  one-half 
  that 
  

  

  Thickness. 
  . 
  

  

  amount 
  will 
  suffice 
  for 
  the 
  thickness 
  of 
  the 
  bedded 
  

  

  traps 
  throughout 
  the 
  greater 
  part 
  of 
  the 
  field. 
  

  

  The 
  trap 
  rocks 
  of 
  Kathiawar 
  resemble, 
  in 
  nearly 
  every 
  respect, 
  those 
  

  

  of 
  the 
  Deccan 
  and 
  Malwa 
  in 
  Peninsular 
  India. 
  Basalts 
  and 
  dolerites 
  

  

  mostly 
  prevail, 
  but 
  felstones, 
  trachytes, 
  diorites, 
  and 
  obsidian 
  also 
  occur, 
  

  

  and 
  beds 
  of 
  scoriacious 
  breccia 
  are 
  occasionally 
  met 
  with. 
  The 
  several 
  

  

  flows 
  vary 
  considerably 
  in 
  character 
  ; 
  those 
  nether- 
  

   Varied 
  character. 
  * 
  . 
  

  

  most 
  are 
  often 
  decomposed, 
  and 
  in 
  places 
  agglc 
  

  

  ( 
  91 
  

  

  