﻿GEOLOGY 
  OF 
  SARATOGA 
  SPRINGS 
  AND 
  VICINITY 
  

  

  25 
  

  

  The 
  norm 
  of 
  the 
  rock 
  of 
  analysis 
  1 
  is 
  as 
  follows 
  : 
  

  

  Class 
  1, 
  persalane 
  

  

  >■ 
  94.34 
  Order 
  4, 
  britannare 
  

   Rang 
  2, 
  toscanase 
  

  

  Orthoclase 
  

  

  22.24" 
  

  

  Albite 
  

  

  36.15 
  

  

  Anorthite 
  

  

  6-95 
  

  

  Quartz 
  

  

  28.80 
  

  

  Corundum 
  

  

  0.20^ 
  

  

  Hypersthene 
  

  

  2.60^ 
  

  

  Magnetite 
  

  

  1 
  .62 
  

  

  Ilmenite 
  

  

  0.76 
  

  

  Apatite 
  

  

  0.17, 
  

  

  Subrang 
  4, 
  lassenose 
  

   K,Q: 
  Na 
  2 
  :: 
  3:5.2 
  

  

  The 
  northwestern 
  New 
  York 
  granites 
  belong 
  in 
  subrang 
  3, 
  tosca- 
  

   nose, 
  while 
  the 
  Ontarian 
  rock 
  is 
  a 
  distinct 
  lassenose. 
  The 
  Sara- 
  

   toga 
  rock 
  is 
  on 
  the 
  border 
  between 
  the 
  two 
  subrangs 
  as 
  the 
  alkali 
  

   ratio 
  shows. 
  

  

  The 
  rock 
  differs 
  considerably 
  in 
  appearance 
  from 
  the 
  usual 
  

   Laurentian 
  granite 
  of 
  Canada 
  and 
  northern 
  New 
  York, 
  the 
  chief 
  

   differences 
  being 
  the 
  white 
  color 
  and 
  the 
  content 
  of 
  pink 
  garnet. 
  

   In 
  the 
  Thousand 
  Islands 
  region 
  we 
  have 
  shown 
  that 
  the 
  red 
  Lau- 
  

   rentian 
  granites 
  have 
  their 
  red 
  feldspars 
  bleached 
  to 
  white 
  in 
  the 
  

   vicinity 
  of 
  Grenville 
  limestones. 
  1 
  We 
  have 
  seen 
  similar 
  bleached 
  

   granites 
  in 
  Ontario 
  in 
  like 
  situation. 
  About 
  Saratoga 
  the 
  granite 
  

   masses 
  are 
  small 
  and 
  suggest 
  that 
  erosion 
  here 
  is 
  just 
  beginning 
  to 
  

   uncover 
  a 
  granite 
  bathylith 
  and 
  has 
  reached 
  only 
  a 
  few 
  of 
  the 
  

   higher 
  protuberances, 
  full 
  of 
  included 
  rock 
  masses. 
  This 
  might 
  

   suggest 
  that 
  the 
  granite 
  would 
  run 
  into 
  red 
  rock 
  in 
  depth, 
  but 
  the 
  

   matter 
  is 
  not 
  urged 
  since 
  the 
  chief 
  inclosing 
  rocks 
  are 
  schists 
  which 
  

   are 
  poor 
  in 
  lime. 
  

  

  •Because 
  it 
  gives 
  rise 
  to 
  pegmatites 
  and 
  has 
  the 
  composition 
  of 
  a 
  

   granite, 
  this 
  rock 
  is 
  regarded 
  as 
  igneous. 
  It 
  is 
  further 
  regarded 
  

   as 
  Laurentian. 
  for 
  two 
  reasons: 
  first, 
  because 
  it 
  is 
  distinctly 
  older 
  

   than 
  the 
  syenite 
  which 
  cuts 
  it 
  intrusively 
  just 
  as 
  it 
  cuts 
  the 
  Gren- 
  

   ville 
  ; 
  and 
  second, 
  because 
  it 
  also 
  shows 
  its 
  great 
  age 
  by 
  the 
  intricate 
  

   manner 
  in 
  which 
  it 
  is 
  involved 
  with 
  the 
  Grenville 
  and 
  has 
  been 
  

   metamorphosed 
  in 
  common 
  with 
  it. 
  In 
  the 
  latter 
  respect 
  it 
  fur- 
  

   nishes 
  a 
  strong 
  contrast 
  with 
  the 
  Laurentian 
  granites 
  of 
  north- 
  

   western 
  New 
  York, 
  whose 
  relations 
  with 
  the 
  Grenville 
  are 
  much 
  

   less 
  involved 
  and 
  more 
  obvious. 
  This 
  contrast 
  is 
  to 
  be 
  attributed 
  

   to 
  the 
  fact 
  that 
  the 
  Precambric 
  rocks 
  of 
  the 
  Adirondacks 
  show 
  a 
  

  

  1 
  N. 
  Y. 
  State 
  Mus. 
  Bui. 
  145, 
  p. 
  46-7, 
  177-180. 
  

  

  