﻿542 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  which 
  has 
  been 
  so 
  often 
  referred 
  to, 
  was 
  gathered. 
  It 
  contains 
  

   however, 
  abundant 
  quartz, 
  and 
  is 
  an 
  acidic 
  member 
  of 
  this 
  series. 
  

   The 
  same 
  type 
  of 
  rock 
  is 
  found 
  to 
  the 
  east, 
  extending 
  into 
  

   Bolton. 
  Somewhere 
  about 
  no. 
  132 
  a 
  fault 
  breccia 
  was 
  met 
  which 
  

   has 
  innumerable 
  angular 
  fragments 
  of 
  gneiss, 
  mixed 
  up 
  in 
  a 
  

   black 
  groundmass 
  or 
  paste 
  of 
  chloritic 
  decomposition 
  products. 
  

   The 
  remaining 
  gneisses 
  of 
  the 
  township 
  are 
  quartz, 
  granitic 
  -in 
  

   their 
  mineralogy, 
  i. 
  e., 
  they 
  contain 
  quartz, 
  orthoclase, 
  biotite, 
  

   plagioclase, 
  and 
  sometimes 
  hornblende. 
  They 
  are 
  often 
  thickly 
  

   seamed 
  with 
  pegmatite 
  dikes, 
  specially 
  in 
  the 
  neighborhood 
  of 
  

   the 
  crystalline 
  limestones. 
  The 
  western 
  shores 
  of 
  Brant 
  lake, 
  

   near 
  the 
  outlet, 
  are 
  illustrations, 
  though 
  at 
  this 
  point 
  no 
  lime- 
  

   stones 
  have 
  been 
  found. 
  

  

  Series 
  2. 
  The 
  limestones 
  appear 
  in 
  six 
  different 
  areas 
  which 
  

   will 
  be 
  at 
  once 
  apparent 
  from 
  the 
  map. 
  They 
  are 
  of 
  the 
  usual 
  

   variety, 
  coarsely 
  crystalline, 
  white 
  marble, 
  thickly 
  set 
  with 
  

   pyroxene 
  crystals, 
  and 
  often 
  provided 
  with 
  graphite 
  and 
  with 
  

   pegmatite 
  streaks. 
  They 
  appear 
  to 
  be 
  interfoliated 
  with 
  the 
  

   gneisses, 
  but 
  we 
  have 
  not 
  been 
  able 
  to 
  discover 
  evidence 
  of 
  other 
  

   sedimentaries 
  with 
  them. 
  The 
  gneisses 
  do 
  however 
  often 
  as- 
  

   sume 
  schistose 
  structures 
  near 
  them, 
  more 
  often 
  than 
  elsewhere. 
  

  

  Series 
  3. 
  In 
  the 
  southern 
  part 
  of 
  the 
  township, 
  gabbros 
  are 
  

   quite 
  abundant, 
  eight 
  exposures 
  having 
  been 
  found 
  in 
  all. 
  They 
  

   are 
  of 
  the 
  usual 
  variety, 
  and 
  are 
  not 
  infrequently 
  squeezed 
  to 
  

   hornblende 
  schist. 
  At 
  specimen 
  139, 
  about 
  a 
  mile 
  east 
  of 
  Burnt 
  

   pond, 
  a 
  gabbro 
  dike 
  has 
  been 
  shattered 
  by 
  faulting 
  and 
  pressure 
  

   and 
  into 
  the 
  cracks 
  granulated 
  gneiss 
  like 
  the 
  country 
  rock 
  has 
  

   been 
  squeezed 
  so 
  as 
  to 
  form 
  a 
  matrix 
  in 
  which 
  the 
  masses 
  of 
  

   gabbro 
  are 
  set. 
  The 
  gabbro 
  has 
  resisted 
  granulation 
  much 
  

   better 
  than 
  the 
  gneiss, 
  and 
  has 
  broken 
  into 
  angular 
  fragments 
  

   several 
  inches 
  across, 
  while 
  the 
  gneiss 
  has 
  granulated 
  and 
  

   flowed. 
  

  

  Series 
  4. 
  The 
  township 
  contains 
  no 
  paleozoio 
  strata. 
  Bould- 
  

   ers 
  of 
  Potsdam 
  sandstone 
  occur 
  in 
  the 
  drift. 
  

  

  Series 
  5. 
  No 
  trap 
  dikes 
  were 
  observed. 
  

  

  Series 
  6. 
  Glacial 
  drift 
  is 
  frequent 
  and 
  widespread. 
  Striations 
  

   or 
  scratches 
  have 
  been 
  observed 
  in 
  three 
  instances. 
  One 
  south 
  

  

  