﻿Rocks* 
  in 
  Littleton, 
  JSew 
  Hampshii^e. 
  

  

  241 
  

  

  these 
  conclusions 
  depends 
  on 
  certain 
  characters 
  of 
  the 
  overly- 
  

   ing 
  (to 
  the 
  south) 
  Blueberry 
  Mt. 
  sediments, 
  which 
  we 
  shall 
  

   describe 
  below. 
  

  

  Since 
  the 
  northern 
  contact 
  of 
  the 
  Fitch 
  Hill 
  granite 
  gneiss 
  

   is 
  intrusive 
  in 
  its 
  nature 
  and 
  the 
  southern 
  contact 
  is 
  an 
  uncon- 
  

   formity, 
  (1) 
  the 
  original 
  differentiation 
  must 
  have 
  been 
  one 
  of 
  

   increasing 
  basicity 
  toward 
  the 
  margin 
  (northward), 
  and 
  (2) 
  the 
  

   age 
  of 
  this 
  granite 
  gneiss 
  must 
  be 
  intermediate 
  between 
  that 
  

  

  Fig. 
  5. 
  

  

  Fig. 
  5. 
  Fossil 
  concentric 
  weathering. 
  The 
  rock 
  in 
  the 
  right 
  foreground 
  

   is 
  the 
  Fitch 
  Hill 
  granite 
  gneiss. 
  It 
  is 
  partly 
  surrounded 
  by 
  layers 
  of 
  the 
  

   disintegrated 
  gneiss, 
  which 
  have 
  been 
  reconso 
  Undated 
  since 
  the 
  time 
  when 
  the 
  

   weathering 
  was 
  in 
  process. 
  The 
  hammer 
  stands 
  on 
  arkose 
  which 
  was 
  

   formed 
  from 
  the 
  completely 
  disintegrated 
  products 
  of 
  the 
  gneiss. 
  Photo 
  by 
  

   F. 
  H. 
  L. 
  

  

  of 
  the 
  Lyman 
  schists 
  and 
  that 
  of 
  the 
  Niagaran 
  sediments 
  on 
  

   the 
  south. 
  

  

  The 
  Blueberry 
  Mountain 
  Series 
  on 
  Fitch 
  Hill. 
  — 
  Blueberry 
  

   Mt. 
  is 
  regarded 
  as 
  a 
  synclinal 
  ridge.* 
  The 
  base 
  of 
  the 
  

  

  * 
  Hitchcock 
  : 
  Geology 
  of 
  Littleton, 
  p. 
  15. 
  

  

  