﻿MEMOIRS 
  

  

  OP 
  THE 
  

  

  GEOLOGICAL 
  SURVEY 
  OF 
  INDIA 
  

  

  On 
  the 
  Geology 
  of 
  parts 
  of 
  the 
  Madras 
  and 
  North 
  Arcot 
  Districts 
  lying 
  

   north 
  of 
  the 
  Tatar 
  River, 
  and 
  included 
  in 
  Sheet 
  78 
  of 
  the 
  Indian 
  

   Atlas, 
  by 
  R. 
  Bruce 
  Foote, 
  F. 
  G-. 
  S., 
  Geological 
  Survey 
  of 
  India. 
  

  

  CONTENTS. 
  

  

  Chap. 
  

  

  I. 
  

  

  II. 
  

  

  III. 
  

  

  IV. 
  

  

  V. 
  

  

  VI. 
  

  

  VII. 
  

  

  General 
  sketch 
  of 
  area. 
  

   Previous 
  observers. 
  

   Sub-aerial 
  formations 
  — 
  

  

  a. 
  Blown 
  sands. 
  

  

  b. 
  Soils. 
  

  

  Alluvial 
  formations 
  — 
  

  

  a. 
  Marine 
  and 
  estuarine 
  

  

  alluvia. 
  

  

  b. 
  Fluvial 
  alluvia. 
  

   Lateritic 
  formations 
  — 
  

  

  a. 
  Laterite, 
  conglomerates, 
  

  

  gravels 
  and 
  sands. 
  

  

  b. 
  Conjeveram 
  gravels. 
  

  

  c. 
  On 
  the 
  occurrence 
  of 
  

  

  stone 
  implements. 
  

   Tertiary 
  rocks 
  ; 
  Cuddalore 
  

  

  sandstones. 
  

   Cretaceous 
  rocks. 
  

  

  Chap. 
  VIII. 
  Jurassic 
  rocks; 
  Rajmahal 
  

   series. 
  

  

  a. 
  Sattavedu 
  area. 
  

  

  b. 
  Alicoor 
  area, 
  

   e, 
  Pyanoor 
  area. 
  

  

  d. 
  Sripermatoor 
  area. 
  

  

  1, 
  — 
  Northern 
  part 
  of 
  area. 
  

   2. 
  — 
  Southern 
  „ 
  „ 
  

  

  3. 
  — 
  Outliers 
  of 
  the 
  Sriper- 
  

   matoor 
  area. 
  

   „ 
  IX. 
  Sub-metamorphic 
  rocks; 
  Ka- 
  

  

  dapa 
  series. 
  

   „ 
  X. 
  Metamorphic 
  rocks; 
  gneissic 
  

  

  series 
  — 
  

  

  a. 
  Granitic 
  rocks 
  intrusive 
  

  

  in 
  gneissic 
  series. 
  

  

  b. 
  Trappean 
  rocks 
  intrusive 
  

  

  in 
  gneissic 
  series. 
  

   „ 
  XI. 
  Economic 
  geology. 
  

  

  Chapter 
  I. 
  — 
  General 
  sketch 
  op 
  the 
  area. 
  

  

  The 
  shape 
  of 
  the 
  area 
  here 
  described 
  is 
  rather 
  irregular, 
  its 
  

  

  boundaries 
  being, 
  to 
  the 
  south, 
  the 
  Palar 
  river 
  ; 
  on 
  the 
  east, 
  the 
  sea 
  ; 
  

  

  on 
  the 
  north, 
  a 
  line 
  commencing 
  at 
  the 
  sea 
  ten 
  miles 
  northward 
  of 
  

  

  Pulicat, 
  crossing 
  the 
  lagoon 
  diagonally 
  to 
  Meddpolliam, 
  and 
  continued 
  

  

  ( 
  1 
  ) 
  

   Mem. 
  Geol. 
  Surv. 
  of 
  India, 
  Vol. 
  X, 
  Art. 
  1. 
  

  

  