﻿120 
  FOOTE 
  : 
  GEOLOGY 
  OF 
  MADRAS. 
  

  

  . 
  exposed 
  by 
  denudation, 
  but 
  is 
  probably 
  still 
  in 
  situ. 
  This 
  compact 
  

   sandstone 
  has 
  been 
  weathered 
  on 
  the 
  surface 
  in 
  such 
  a 
  manner 
  as 
  to 
  

   simulate 
  a 
  gigantic 
  fungoid 
  coral. 
  The 
  surface 
  shows 
  all 
  round 
  distinct 
  

   radiating 
  prominences, 
  with 
  slight 
  fossse 
  between, 
  but 
  no 
  organic 
  structure 
  

   whatever 
  could 
  be 
  discerned 
  in 
  the 
  mass, 
  nor 
  any 
  mineral 
  peculiarity 
  

   to 
  account 
  for 
  this 
  somewhat 
  remarkable 
  appearance. 
  The 
  sandy 
  and 
  

   gritty 
  beds 
  yielded 
  nothing 
  but 
  impressions 
  of 
  fragmentary 
  and 
  ill- 
  

   preserved 
  plant-stalks. 
  In 
  one 
  spot, 
  however, 
  on 
  the 
  east 
  side 
  of 
  the 
  

   main 
  gully 
  a 
  large 
  lenticular 
  concretionary 
  (but 
  not 
  concentrically 
  ag- 
  

   gregated) 
  mass 
  of 
  ferruginous 
  sandstone 
  of 
  dark-brown 
  color 
  and 
  very 
  

   fine 
  texture 
  yielded 
  a 
  great 
  number 
  of 
  vegetable 
  impressions 
  ; 
  indeed 
  

   the 
  freshly 
  broken 
  surfaces 
  between 
  the 
  central 
  laminse 
  especially 
  were 
  

   altogether 
  covered 
  with 
  impressions 
  of 
  leaves, 
  &c. 
  These 
  impressions, 
  

   many 
  of 
  which 
  were 
  very 
  well 
  preserved, 
  represent 
  a 
  considerable 
  number 
  

   of 
  typical 
  Rajmahal 
  plants, 
  as 
  Palaozamia, 
  Sp/ienopteris 
  ? 
  In 
  the 
  

   underlying 
  clayey 
  stratum, 
  only 
  a 
  few 
  inches 
  of 
  which 
  was 
  exposed, 
  a 
  

   few 
  fossils 
  were 
  also 
  found, 
  namely, 
  part 
  of 
  a 
  frond 
  of 
  a 
  Palaozamia, 
  

   part 
  of 
  a 
  coniferous 
  leaf, 
  a 
  leaf 
  of 
  doubtful 
  character, 
  numerous 
  im- 
  

   pressions 
  of 
  stalks 
  of 
  no 
  special 
  character, 
  and, 
  lastly, 
  the 
  cast 
  of 
  one 
  

   valve 
  of 
  a 
  conchiferous 
  mollusc. 
  

  

  The 
  lateritic 
  gravel 
  which 
  forms 
  a 
  small, 
  but 
  well 
  marked 
  scarp 
  

   immediately 
  north 
  of 
  Little 
  Conjeveram, 
  contains 
  much 
  washed-up 
  

   material 
  derived 
  from 
  the 
  Rajmahal 
  beds. 
  Rounded 
  fragments 
  of 
  the 
  

   tesselated 
  ironstone 
  concretions, 
  which 
  occasionally 
  contain 
  characteristic 
  

   vegetable 
  remains, 
  are 
  by 
  no 
  means 
  uncommon 
  among 
  the 
  lateritic 
  

   gravel. 
  

  

  West-south-west 
  of 
  Great 
  Conjeveram 
  at 
  a 
  spot 
  about 
  f 
  of 
  a 
  mile 
  

  

  east 
  of 
  the 
  village 
  of 
  Vizier, 
  buff, 
  friable, 
  shaley 
  

   Vizier 
  section. 
  

  

  sandstones 
  are 
  exposed 
  in 
  the 
  sides 
  of 
  a 
  well 
  under 
  

   a 
  gritty 
  bed 
  of 
  the 
  Conjeveram 
  gravels 
  8 
  or 
  10 
  feet 
  thick. 
  This 
  well 
  

   was 
  unfortunately 
  inaccessible, 
  the 
  usual 
  flight 
  of 
  steps 
  being 
  absent, 
  

   ( 
  1^0 
  ) 
  

  

  