﻿GEOLOGY 
  OF 
  THE 
  PORT 
  LEYDEN 
  QUADRANGLE 
  5/ 
  

  

  a 
  more 
  massive 
  stone. 
  The 
  most 
  extensive 
  quarries 
  are 
  between 
  

   the 
  mouth 
  of 
  Sugar 
  river 
  and 
  Denley 
  station. 
  

  

  Other 
  good 
  building 
  stone 
  is 
  found 
  in 
  the 
  Trenton 
  Hmestone, 
  

   especially 
  the 
  upper 
  portion. 
  This 
  rock 
  is 
  gray, 
  coarse 
  grained, 
  

   crystalline, 
  and 
  pretty 
  pure 
  and 
  may 
  be 
  quarried 
  in 
  layers 
  from 
  a 
  

   few 
  inches 
  to 
  a 
  foot 
  thick. 
  The 
  stone 
  is 
  much 
  used 
  locally 
  and 
  

   was 
  formerly 
  burnt 
  in 
  great 
  quantities 
  for 
  the 
  production 
  of 
  lime. 
  

   The 
  chief 
  quarries 
  are 
  at 
  Talcottville, 
  Turin 
  and 
  Alartinsburg. 
  The 
  

   sandstones 
  of 
  the 
  upper 
  Lorraine 
  are 
  strewn 
  over 
  the 
  highlands 
  on 
  

   the 
  west 
  and 
  are 
  of 
  considerable 
  local 
  use. 
  

  

  Of 
  the 
  Precambric 
  rocks, 
  the 
  syenite 
  is 
  an 
  excellent 
  building 
  

   material. 
  It 
  is 
  a 
  very 
  hard, 
  greenish 
  to 
  reddish, 
  rather 
  granitic 
  

   syenite 
  which 
  takes 
  a 
  high 
  polish. 
  The 
  expense 
  of 
  quarrying 
  and 
  

   transportation 
  have 
  almost 
  entirely 
  prevented 
  its 
  exploitation. 
  A 
  

   quarry 
  from 
  which 
  syenite 
  of 
  fine 
  quality 
  has 
  been 
  taken 
  is 
  located 
  

   about 
  a 
  mile 
  east 
  of 
  Denley 
  station. 
  

  

  Road 
  materials 
  

  

  Most 
  of 
  the 
  Precambric 
  rocks, 
  but 
  especially 
  the 
  syenite, 
  because 
  

   of 
  its 
  great 
  durability, 
  when 
  crushed 
  would 
  yield 
  excellent 
  road 
  

   materials. 
  IMost 
  of 
  the 
  stone 
  now 
  used 
  for 
  road 
  work 
  comes 
  from 
  

   the 
  Lowville 
  and 
  upper 
  Trenton 
  limestones 
  because 
  this 
  stone 
  i-^^ 
  

   cheaply 
  quarried 
  and 
  crushed 
  and 
  is 
  fairly 
  durable. 
  

  

  Sand 
  and 
  gravel 
  

  

  As 
  above 
  explained 
  much 
  of 
  the 
  country 
  east 
  of 
  the 
  river 
  is 
  

   deeply 
  covered 
  with 
  sand 
  and 
  gravel, 
  often 
  of 
  good 
  quality 
  for 
  ail 
  

   sorts 
  of 
  uses. 
  The 
  increasing 
  demand 
  for 
  such 
  materials 
  will, 
  in 
  

   the 
  future, 
  doubtless 
  cause 
  the 
  exploitation 
  of 
  these 
  immense 
  

   deposits. 
  

  

  Iron 
  ore 
  

  

  In 
  the 
  above 
  descriptions 
  of 
  the 
  Precambric 
  rocks, 
  magnetite, 
  in 
  

   small 
  grains, 
  is 
  seen 
  to 
  be 
  very 
  commonly 
  present. 
  Many 
  times 
  

   patches 
  of 
  magnetite 
  i 
  or 
  2 
  inches 
  across 
  have 
  bQcn 
  observed 
  in 
  

   the 
  mixed 
  gneisses 
  and 
  in 
  the 
  more 
  acid 
  phases 
  of 
  the 
  syenite 
  and 
  

   they 
  have 
  every 
  appearance 
  of 
  being 
  segregation 
  masses. 
  An 
  ore 
  

   body 
  several 
  feet 
  across 
  has 
  been 
  found 
  on 
  the 
  Murtaugh 
  farm 
  2 
  

   miles 
  east 
  of 
  Glcnfield. 
  It 
  is 
  magnetite 
  mixed 
  with 
  much 
  pyrite 
  

   and 
  is 
  closely 
  associated 
  with 
  pegmatitic 
  material 
  in 
  the 
  granitic 
  

   syenite. 
  The 
  pegmatite 
  and 
  ore 
  seem 
  to 
  grade 
  into 
  the 
  country 
  

   rock 
  and 
  probably 
  represent 
  a 
  segregation 
  mass. 
  

  

  