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  C. 
  CALLAWAY 
  ON 
  THE 
  TOKKIDON 
  SANDSTONE. 
  

  

  that 
  some 
  3000 
  or 
  4000 
  feet 
  of 
  Torridon 
  Sandstone 
  and 
  quartzite 
  

   had 
  completely 
  thinned 
  out 
  in 
  a 
  very 
  short 
  distance 
  (less 
  than 
  three 
  

   miles), 
  or 
  that 
  the 
  newer 
  gneiss, 
  which 
  overlies 
  the 
  limestone, 
  is, 
  as 
  

   the 
  Survey 
  stated, 
  Lower 
  Silurian. 
  

  

  Dr. 
  Callaway 
  said 
  that 
  when 
  Dr. 
  Heddle 
  was 
  present 
  he 
  would 
  

   be 
  glad 
  to 
  discuss 
  the 
  question. 
  He 
  did 
  not 
  feel 
  able 
  to 
  express 
  an 
  

   opinion 
  as 
  to 
  the 
  age 
  of 
  the 
  newer 
  gneiss. 
  The 
  section 
  described 
  by 
  

   him 
  at 
  Assynt 
  was 
  identical 
  with 
  that 
  described 
  by 
  Sir 
  E. 
  Mur- 
  

   chison. 
  There 
  might 
  or 
  might 
  not 
  be 
  unconformity 
  about 
  Loch 
  

   Maree 
  ; 
  all 
  he 
  said 
  was 
  that 
  in 
  the 
  more 
  northern 
  districts 
  there 
  was 
  

   none. 
  He 
  was 
  prepared 
  to 
  admit 
  that 
  the 
  Torridon 
  Sandstone 
  had 
  

   thinned 
  out 
  with 
  great 
  rapidity. 
  This 
  was 
  well 
  seen 
  north-east 
  of 
  

   Queenaig, 
  where 
  the 
  sandstone, 
  less 
  than 
  50 
  yards 
  thick, 
  passed 
  

   unconformably 
  under 
  the 
  quartzite. 
  

  

  