﻿LAURENTIAN 
  LIMESTONES 
  OF 
  NORTH 
  AMERICA. 
  

  

  69 
  

  

  northern 
  New 
  York, 
  are 
  to 
  be 
  added 
  those 
  of 
  the 
  Highlands 
  of 
  

   the 
  Hudson, 
  and 
  their 
  extension 
  in 
  Orange 
  county, 
  New 
  York, 
  and 
  

   in 
  Sussex 
  county, 
  New 
  Jersey. 
  The 
  observations 
  of 
  Prof. 
  J. 
  Hall 
  

   and 
  Sir 
  William 
  Logan 
  upon 
  these 
  rocks 
  in 
  the 
  Highlands, 
  have 
  

   confirmed 
  the 
  views 
  of 
  those 
  who 
  had 
  previously 
  asserted 
  them 
  to 
  

   be 
  older 
  than 
  the 
  Lower 
  Silurian 
  series, 
  and 
  shown 
  that 
  they 
  are 
  

   doubtless 
  of 
  Laurentian 
  age. 
  This 
  more 
  southern 
  area 
  is 
  much 
  

   better 
  known 
  and 
  explored 
  than 
  the 
  comparatively 
  wild 
  and 
  uncul- 
  

   tivated 
  Laurentian 
  region 
  of 
  Canada, 
  yet 
  with 
  the 
  exception 
  of 
  the 
  

   remarkable 
  zinciferous 
  minerals, 
  franklioite, 
  red 
  zinc 
  ore, 
  wille- 
  

   mite 
  and 
  dysluite, 
  which 
  are 
  confined 
  to 
  a 
  small 
  section 
  in 
  New 
  

   Jersey, 
  nearly 
  all 
  the 
  mineral 
  species 
  of 
  these 
  limestones 
  found 
  in 
  

   the 
  United 
  States 
  have 
  already 
  been 
  recognized 
  in 
  Canada. 
  

   Minerals 
  of 
  the 
  Laurentian 
  Limestones 
  of 
  North 
  America. 
  

  

  Calcite. 
  

   Dolomite. 
  

   Fluor-spar. 
  

   Heavy-spar. 
  

   Apatite. 
  

   Serpentine. 
  

   Chrysolite. 
  

   Chondrocyte. 
  

   Tephroite. 
  

   Wi 
  lie 
  mite. 
  

   Wollastonite. 
  

   Hornblende. 
  

   Pyroxene. 
  

   Babingtonite. 
  

   Pyrallolite, 
  

   Talc. 
  

  

  Gieseckite. 
  

   Loganite. 
  

   Scapolite. 
  

   Orthoclase. 
  

   Oligoclase. 
  

   Phlogopite. 
  

   Margarite. 
  

   Clintonite. 
  

   Tourmaline. 
  

   Garnet. 
  

   Idocrase. 
  

   [Senate 
  No. 
  92.] 
  

  

  Epidote. 
  

   Allanite. 
  

   Zircon. 
  

   Spinel. 
  

   Volknerlte. 
  

   Coranclum, 
  

   Quartz- 
  

   es 
  p 
  he 
  ne, 
  

   Warwiekite- 
  

   Jlmenite. 
  

   Hutile. 
  

   Magnetite. 
  

   Hematite. 
  

   Franklinite. 
  

   Zineifce. 
  

   Cubic 
  pyrites. 
  

   Magnetic 
  pyrites. 
  

   Copper 
  pyrites. 
  

   Mispickle. 
  

   Fahlerz. 
  

   Bismuthine. 
  

   Blende. 
  

  

  Antimony 
  glance. 
  

   Molybdenite. 
  

   Gold. 
  

   Graphite. 
  

   Anthracite. 
  

  

  