﻿CRYSTALLINE 
  ROCKS 
  OF 
  THE 
  WESTERN 
  ADIRONDACK 
  REGION 
  475 
  

  

  present 
  paper 
  only 
  new 
  localities 
  and 
  old 
  ones 
  that 
  have 
  been 
  

   reexamined 
  need 
  be 
  considered. 
  

  

  The 
  apparent 
  inclusions 
  of 
  pyroxene 
  gneiss 
  of 
  the 
  limestone 
  

   series 
  in 
  the 
  syenite, 
  occurring 
  about 
  a 
  mile 
  southeast 
  of 
  Harris- 
  

   ville 
  (pi. 
  4 
  and 
  5) 
  were 
  examined 
  again 
  with 
  great 
  care, 
  and 
  

   the 
  immediate 
  vicinity 
  was 
  gone 
  over 
  thoroughly. 
  The 
  pheno- 
  

   mena 
  are 
  even 
  more 
  striking 
  than 
  at 
  the 
  first 
  examination 
  and 
  it 
  

   seems 
  impossible 
  to 
  explain 
  them 
  as 
  anything 
  but 
  true 
  inclusions 
  

   in 
  an 
  igneous 
  rock. 
  The 
  pyroxene 
  gneiss 
  is 
  in 
  irregular, 
  angular 
  

   fragments 
  from 
  a 
  few 
  inches 
  up 
  to 
  several 
  rods 
  in 
  diameter, 
  and 
  

   is 
  scattered 
  through 
  the 
  syenite 
  (here 
  unusually 
  massive) 
  in 
  the 
  

   most 
  irregular 
  manner. 
  The 
  pronounced 
  banding 
  of 
  the 
  pyroxene 
  

   gneiss 
  is 
  variously 
  oriented 
  in 
  the 
  different 
  blocks, 
  and 
  is 
  entirely 
  

   independent 
  of 
  the 
  prevailing 
  northeast 
  trend 
  of 
  foliation 
  which 
  

   'the 
  gneisses 
  have 
  when 
  in 
  place. 
  But 
  where 
  a 
  gneiss 
  fragment 
  

   is 
  long 
  and 
  narrow 
  its 
  longest 
  diameter 
  tends 
  to 
  assume 
  parallel- 
  

   ism 
  with 
  the 
  prevailing 
  strike. 
  Narrow 
  spaces 
  between 
  adjacent 
  

   inclusions 
  are 
  filled 
  by 
  the 
  syenite 
  which 
  also 
  sends 
  tongues 
  into 
  

   the 
  pyroxene 
  gneiss, 
  implying 
  a 
  high 
  degree 
  of 
  plasticity 
  in 
  the 
  

   syenite 
  while 
  the 
  pyroxene 
  gneiss 
  was 
  entirely 
  solid. 
  How 
  this 
  

   could 
  occur 
  except 
  as 
  the 
  syenite 
  was 
  in 
  the 
  molten 
  state 
  it 
  is 
  

   difficult 
  to 
  see. 
  As 
  if 
  to 
  give 
  added 
  meaning 
  to 
  these 
  phenomena, 
  

   the 
  syenite 
  close 
  to 
  the 
  inclusions 
  sometimes 
  shows 
  a 
  slight 
  band- 
  

   ing 
  parallel 
  to 
  the 
  adjacent 
  side 
  of 
  the 
  inclusion, 
  only 
  to 
  be 
  ex- 
  

   plained 
  as 
  ajow 
  structure. 
  

  

  These 
  facts 
  are 
  restated 
  here 
  because 
  they 
  afford 
  the 
  strongest 
  

   single 
  piece 
  of 
  evidence 
  as 
  to 
  the 
  origin 
  of 
  the 
  syenite, 
  and 
  would 
  

   be 
  of 
  the 
  utmost 
  value 
  even 
  were 
  they 
  not 
  supported 
  by 
  numer- 
  

   ous 
  other 
  data 
  leading 
  to 
  the 
  same 
  conclusion. 
  

  

  To 
  find 
  in 
  their 
  normal 
  position 
  rocks 
  closely 
  resembling 
  the 
  

   included 
  pyroxene 
  gneiss 
  it 
  is 
  only 
  necessary 
  to 
  go 
  about 
  half 
  a 
  

   mile 
  to 
  the 
  northward 
  where 
  rocks 
  of 
  this 
  character 
  are 
  abun- 
  

   dantly 
  shown 
  associated 
  with 
  the 
  limestones. 
  From 
  this 
  it 
  is 
  

   evident 
  that 
  the 
  inclusions 
  show 
  not 
  only 
  that 
  the 
  syenite 
  gneiss 
  

   is 
  igneous 
  but 
  also 
  that 
  it 
  is 
  younger 
  than 
  and 
  intrusive 
  in 
  the 
  

   limestone 
  series. 
  

  

  