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  Crosby 
  — 
  Geology 
  of 
  Newport 
  Neck 
  and 
  Conanicut 
  Is. 
  

  

  From 
  the 
  north 
  end 
  of 
  the 
  ledge 
  southward 
  the 
  slate 
  is 
  rather 
  

   unusually 
  but 
  uniformly 
  shaly 
  for 
  about 
  twenty 
  feet, 
  and 
  then 
  

   we 
  pass 
  with 
  absolute 
  abruptness 
  to 
  the 
  most 
  typical 
  tough, 
  

   massive, 
  and 
  seemingly 
  unstratih'ed 
  hornstone, 
  which 
  forms 
  all 
  

  

  41° 
  SO' 
  

  

  SCALE 
  or 
  FEE 
  

  

  Fig. 
  2. 
  — 
  Map 
  of 
  a 
  part 
  of 
  Conanicut 
  Island, 
  by 
  L. 
  V. 
  Pirsson. 
  

  

  the 
  remainder 
  of 
  an 
  extensive 
  outcrop. 
  The 
  abruptness 
  of 
  

   this 
  passage 
  from 
  the 
  less 
  to 
  the 
  more 
  metamorphic 
  slate 
  sug- 
  

   gests 
  a 
  small 
  fault. 
  This 
  outcrop 
  is 
  about 
  one 
  thousand 
  feet 
  

   from 
  the 
  nearest 
  exposure 
  of 
  granite, 
  and 
  nearly 
  two 
  thousand 
  

   feet 
  from 
  the 
  main 
  body 
  of 
  granite 
  ; 
  and 
  it 
  certainly 
  seems 
  

   improbable 
  that 
  the 
  metamorphic 
  influence 
  of 
  the 
  granite, 
  

  

  