﻿Rocks, 
  in 
  Littleton, 
  New 
  Hampshire. 
  

  

  245 
  

  

  stone 
  is 
  in 
  thin, 
  long 
  lenses 
  between 
  thin 
  calcareous 
  shale 
  

   layers. 
  The 
  limestone 
  has 
  been 
  dissolved 
  down 
  several 
  inches 
  

   below 
  the 
  level 
  of 
  the 
  shale 
  (fig. 
  6). 
  

  

  The 
  sills 
  of 
  Fitch 
  Hill 
  soon 
  disappear 
  and 
  can 
  be 
  traced 
  no 
  

   farther. 
  

  

  The 
  banded 
  argillite 
  of 
  Locs. 
  8 
  and 
  9 
  cannot 
  be 
  definitely 
  

   followed. 
  A 
  similar 
  rock 
  outcrops 
  at 
  17 
  and 
  18, 
  and 
  also 
  at 
  

   Locs. 
  25, 
  28, 
  29, 
  30, 
  31, 
  etc. 
  Locs. 
  14 
  and 
  15 
  are 
  dark 
  gray 
  

   slate. 
  Locs. 
  19 
  and 
  20 
  are 
  coarse 
  conglomerate, 
  traced 
  200 
  or 
  

   300 
  yards 
  along 
  the 
  strike, 
  but 
  no 
  farther. 
  

  

  Fig. 
  6. 
  

  

  Fig. 
  6. 
  Differential 
  weathering. 
  The 
  limestone 
  layers 
  have 
  been 
  dis- 
  

   solved 
  out, 
  leaving 
  the 
  argillaceous 
  layers 
  projecting 
  as 
  ridges. 
  Photo 
  by 
  

   Mr. 
  R. 
  W. 
  Sayles. 
  

  

  The 
  banded 
  argillites 
  of 
  Locs. 
  25 
  and 
  28 
  are 
  easily 
  followed 
  

   southwestward 
  in 
  a 
  belt 
  which 
  runs, 
  parallel 
  to 
  the 
  strikes, 
  

   along 
  the 
  crest 
  of 
  Bald 
  Hill, 
  to 
  the 
  east 
  'of 
  Young's 
  Fond, 
  and 
  

   over 
  the 
  hill 
  in 
  the 
  southwest 
  portion 
  of 
  the 
  map. 
  In 
  the 
  

   northeastern 
  localities 
  this 
  rock 
  is 
  like 
  that 
  in 
  the 
  Fitch 
  Hill 
  

   section, 
  although 
  perhaps 
  a 
  little 
  coarser. 
  It 
  is 
  similar, 
  too, 
  at 
  

   Locs. 
  34-39. 
  At 
  41, 
  and 
  to 
  a 
  more 
  marked 
  degree 
  at 
  44 
  and 
  

   45, 
  it 
  is 
  finer 
  ; 
  and 
  southwestward 
  beyond 
  the 
  border 
  of 
  the 
  

   map 
  it 
  becomes 
  very 
  fine. 
  Accompanying 
  this 
  change 
  of 
  

   texture 
  is 
  also 
  an 
  increase 
  in 
  metamorphism. 
  The 
  more 
  north- 
  

   ern 
  specimens 
  are 
  hard, 
  but 
  are 
  scarcely 
  sheared. 
  Southwest- 
  

   ward 
  the 
  content 
  of 
  secondary 
  mica 
  increases 
  until, 
  in 
  the 
  

   southwest, 
  just 
  off 
  the 
  map, 
  the 
  rock 
  is 
  a 
  fine 
  sericite 
  schist 
  or 
  

   phyllite. 
  The 
  entire 
  Blueberry 
  Mt. 
  series 
  of 
  sediments 
  dis- 
  

  

  