﻿];30 
  POOTE 
  : 
  GEOLOGY 
  OP 
  MADRAS. 
  

  

  Very 
  fine 
  and 
  large 
  blocks 
  of 
  hornblendic 
  gneiss 
  14 
  to 
  16 
  feet 
  long, 
  

   are 
  procurable 
  in 
  the 
  quarries 
  about 
  two 
  and 
  a 
  half 
  miles 
  east- 
  north-east 
  

   of 
  Wallajabad, 
  while 
  the 
  compact 
  sandstones 
  of 
  the 
  Rajmahal 
  beds 
  near 
  

   Conjeveram, 
  and 
  further 
  north 
  between 
  Sirgulpilly 
  and 
  Nagloperam, 
  and 
  

   also 
  close 
  to 
  Sattavedu 
  offer 
  a 
  very 
  easily 
  dressed 
  and 
  moderately 
  durable 
  

   building 
  stone. 
  

  

  Laterite 
  for 
  building 
  and 
  road-making 
  purposes 
  is 
  largely 
  quarried 
  

   at 
  the 
  Red 
  Hills, 
  Palaveram, 
  and 
  the 
  Trivellore 
  Railway 
  Station, 
  besides 
  

   other 
  places, 
  but 
  many 
  more 
  localities 
  where 
  it 
  abounds 
  are 
  quite 
  

   untouched. 
  

  

  Avadi 
  and 
  Tinanoor 
  Railway 
  Stations, 
  Panjur, 
  and 
  Tremunglum 
  

   and 
  Candoor, 
  Sripermatoor, 
  and 
  Cunam 
  on 
  the 
  new 
  Wallajabad-Tri- 
  

   vellore 
  road, 
  also 
  have 
  laterite 
  pits 
  and 
  quarries. 
  The 
  Nellore 
  road 
  

   north 
  of 
  the 
  Narnaveram 
  river 
  is 
  supplied 
  with 
  laterite 
  from 
  the 
  high 
  

   ground 
  near 
  Ingawarpolliam 
  laterite 
  plateau. 
  

  

  For 
  ceramic 
  purposes, 
  the 
  clay 
  and 
  shale 
  beds 
  of 
  the 
  Rajmahal 
  

   series 
  offer 
  an 
  inexhaustible 
  supply 
  of 
  very 
  fine 
  material, 
  more 
  especially 
  

   the 
  purer 
  beds 
  near 
  Sripermatoor 
  and 
  in 
  the 
  Attrampakkam 
  nullah 
  

   valley. 
  A 
  small 
  quantity 
  is, 
  or 
  was 
  till 
  lately, 
  obtained 
  by 
  the 
  Madras 
  

   School 
  of 
  Arts 
  from 
  the 
  beds 
  exposed 
  in 
  the 
  section 
  at 
  Coopum, 
  near 
  

   Perurnalput. 
  

  

  The 
  natives 
  appear 
  entirely 
  to 
  ignore 
  these 
  fine 
  clays, 
  for 
  they 
  are 
  

   too 
  good 
  to 
  be 
  of 
  use 
  for 
  the 
  common 
  red-ware 
  of 
  which 
  the 
  chatties 
  and 
  

   *cooking 
  pots 
  of 
  the 
  common 
  people 
  consist. 
  

  

  Small 
  quantities 
  of 
  gypsum 
  in 
  the 
  form 
  of 
  selenite 
  in 
  crystals 
  

   has 
  also 
  been 
  at 
  times 
  obtained 
  for 
  the 
  use 
  of 
  the 
  School 
  of 
  Arts 
  in 
  

   Madras. 
  It 
  is 
  found 
  in 
  some 
  of 
  the 
  clayey 
  estuarine 
  beds 
  north 
  of 
  

   Madras. 
  

  

  R. 
  BRUCE 
  FOOTE, 
  f.g.s., 
  

   October 
  1871. 
  Geological 
  Survey 
  of 
  India. 
  

  

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