﻿CRYSTALLINE 
  ROCKS 
  OF 
  THE 
  WESTERN 
  ADIRONDACK 
  REGION 
  477 
  

  

  This 
  fact 
  becomes 
  apparent 
  on 
  going 
  a 
  few 
  rods 
  farther 
  west 
  

   where 
  the 
  fine 
  grained 
  gneiss 
  like 
  that 
  at 
  the 
  station 
  is 
  present 
  

   in 
  some 
  quantity. 
  The 
  gneiss 
  is 
  distinctly 
  banded 
  and 
  foliated, 
  

   and 
  these 
  structures 
  are 
  cut 
  squarely 
  across 
  for 
  a 
  distance 
  of 
  

   40 
  feet 
  by 
  the 
  syenite, 
  which 
  partially 
  surrounds 
  an 
  area 
  of 
  

   several 
  square 
  yards 
  of 
  gneiss. 
  Still 
  farther 
  west 
  the 
  syenite 
  

  

  c 
  

  

  \ 
  

  

  A 
  

  

  

  

  

  7777777777^1 
  

  

  Fig. 
  2 
  Contact 
  of 
  syenite 
  with 
  gneiss 
  of 
  limestone 
  series, 
  a 
  Plan, 
  & 
  section 
  along 
  line 
  

   A-B, 
  c 
  section 
  along 
  line 
  C-D. 
  Length 
  of 
  sections 
  about 
  3 
  rods. 
  

  

  sends 
  numerous 
  lenses 
  into 
  the 
  fine 
  grained 
  gneiss, 
  and 
  con- 
  

   tains 
  many 
  included 
  fragments 
  of 
  the 
  latter 
  rock 
  varying 
  

   widely 
  in 
  size 
  and 
  shape. 
  Some 
  of 
  these 
  inclusions 
  are 
  clearly 
  

   defined 
  with 
  sharp 
  boundaries 
  but 
  others 
  are 
  somewhat 
  blended 
  

   with 
  the 
  surrounding 
  syenite 
  as 
  though 
  they 
  had 
  undergone 
  a 
  

   partial 
  melting. 
  One 
  inclusion 
  is 
  a 
  mass 
  of 
  green 
  amphibole 
  and 
  

   pyroxene 
  quite 
  unlike 
  the 
  gray 
  gneiss 
  and 
  probably 
  a 
  highly 
  

   metamorphosed 
  fragment 
  of 
  the 
  limestone. 
  

  

  A 
  diagrammatic 
  section 
  of 
  this 
  locality 
  is 
  shown 
  in 
  fig. 
  3. 
  The 
  

   intrusion 
  of 
  the 
  syenite 
  into 
  the 
  gneiss 
  in 
  the 
  form 
  of 
  narrow 
  

   lenses 
  with 
  their 
  long 
  axes 
  parallel 
  to 
  the 
  foliation 
  is 
  in 
  accord- 
  

   ance 
  with 
  a 
  very 
  general 
  rule 
  in 
  this 
  region, 
  to 
  which, 
  reference 
  

   is 
  made 
  in 
  a 
  former 
  report. 
  Lenses 
  and 
  sheets 
  are 
  of 
  frequent 
  

   occurrence, 
  and 
  the 
  latter 
  in 
  particular 
  often 
  closely 
  simulate 
  

   interbedded 
  layers. 
  

  

  <j 
  

  

  ////// 
  // 
  7»sKsw^$s^^ 
  

  

  Fig. 
  3 
  Contact 
  of 
  syenite 
  and 
  gneiss 
  of 
  limestone 
  series. 
  Tongues 
  of 
  syenite 
  in 
  gneiss 
  and 
  

   inclusions 
  of 
  gneiss 
  in 
  syenite. 
  Length 
  of 
  section 
  about 
  12 
  rods. 
  

  

  About 
  a 
  mile 
  west 
  of 
  the 
  station 
  and 
  just 
  beyond 
  the 
  road 
  to 
  

   Lake 
  Bonaparte 
  the 
  syenite 
  projects 
  out 
  into 
  the 
  valley 
  about 
  an 
  

  

  