﻿REPORT 
  OF 
  THE 
  DIRECTOR 
  9 
  

  

  1 
  b 
  Crystalline 
  rocks 
  

  

  i 
  Altered 
  sediments 
  

   ii 
  Chemical 
  precipitates 
  

  

  2 
  Massive 
  Rocks 
  

  

  2 
  a 
  Acid 
  series 
  

  

  (quartz 
  and 
  orthoclase 
  prominent) 
  

   2 
  b 
  Intermediate 
  seriesi 
  

   2 
  c 
  Basic 
  series 
  ; 
  

  

  (quartz 
  and 
  orthoclase 
  usually 
  absent. 
  Magnesia- 
  

   iron 
  silicates 
  and 
  basic 
  feldspars 
  predominant) 
  

  

  3 
  Schistose 
  rocks 
  

  

  (metamorphic 
  rocks) 
  

  

  B 
  Rock 
  characteristics 
  

  

  1 
  Characteristics 
  of 
  stratified 
  rocks 
  

  

  I 
  a 
  Lamination 
  ' 
  

   I 
  b 
  Jointing 
  

  

  I 
  c 
  Preservation 
  of 
  foot-prints, 
  mud 
  cracks, 
  etc., 
  in 
  

   strata 
  

  

  1 
  d 
  Fossils 
  

  

  i 
  Animal 
  life 
  

   formati9n 
  ) 
  

  

  ) 
  of 
  fossils 
  

   preservation 
  ) 
  

  

  ii 
  Vegetable 
  life 
  

   formation 
  ) 
  

  

  ) 
  of 
  fossils 
  

   preservation 
  ) 
  

   2 
  e 
  Coloring 
  

  

  2 
  Characteristics 
  of 
  crystalline 
  rocks 
  

  

  2 
  a 
  Micro-crystalline 
  structure 
  

   2 
  b 
  Macro-crystalHne 
  structure 
  

   2 
  c 
  Banded 
  structure 
  

  

  2 
  d 
  Amygdaloidal 
  structure 
  

  

  