﻿360 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  In 
  this 
  latter 
  belt 
  they 
  are 
  often 
  metamorphosed 
  or 
  folded, 
  

   but 
  along 
  the 
  lake 
  shore, 
  specially 
  along 
  the 
  margin 
  of 
  the 
  

   Adirondack 
  island 
  of 
  crystalline 
  rocks, 
  the 
  beds 
  are 
  little 
  dis- 
  

   turbed 
  and 
  sometimes 
  highly 
  fossilif 
  erous. 
  The 
  Birdseye 
  rarely 
  

   exceeds 
  six 
  feet 
  in 
  thickness. 
  It 
  is 
  a 
  pure 
  dove 
  colored 
  to 
  dark 
  

   gray 
  limestone 
  with 
  conchoidal 
  fracture 
  and 
  often 
  containing 
  

   veins 
  of 
  quartz 
  or 
  calcite. 
  

  

  The 
  Black 
  river 
  limestone 
  also 
  occurs 
  in 
  the 
  Champlain 
  valley 
  

   and 
  is 
  locally 
  known 
  as 
  Isle 
  Lamotte 
  marble. 
  It 
  has 
  a 
  varying 
  

   thickness 
  from 
  35 
  feet 
  on 
  Larrabee's 
  point 
  to 
  75 
  feet 
  on 
  Crown 
  

   point 
  and 
  20 
  feet 
  at 
  Plattsburg. 
  The 
  stone 
  is 
  usually 
  heavy 
  

   bedded, 
  tough, 
  compact 
  and 
  black. 
  

  

  The 
  Trenton 
  proper 
  is 
  well 
  exposed 
  at 
  Crown 
  Point, 
  N. 
  Y. 
  

   where 
  it 
  has 
  a 
  thickness 
  of 
  150 
  feet. 
  It 
  is 
  usually 
  thin 
  bedded 
  

   and 
  shaly 
  but 
  contains 
  several 
  beds 
  of 
  purer 
  limestone. 
  

  

  Beginning 
  at 
  a 
  point 
  about 
  one 
  half 
  mile 
  south 
  of 
  Smiths 
  

   Basin 
  in 
  Washington 
  co. 
  the 
  Trenton 
  limestone 
  extends 
  north- 
  

   ward 
  passing 
  east 
  of 
  North 
  Granville, 
  east 
  of 
  Whitehall 
  which 
  

   lies 
  on 
  the 
  western 
  edge 
  of 
  the 
  belt, 
  then 
  northward 
  in 
  a 
  belt 
  

   from 
  one 
  mile 
  to 
  half 
  a 
  mile 
  wide, 
  past 
  Benson 
  Landing 
  and 
  

   northward 
  into 
  Vermont. 
  The 
  town 
  of 
  Vergennes 
  lies 
  on 
  the 
  

   eastern 
  border 
  of 
  the 
  belt. 
  Another 
  strip 
  of 
  this 
  same 
  rock 
  is 
  

   found 
  farther 
  south 
  in 
  Washington 
  co. 
  extending 
  from 
  a 
  point 
  

   half 
  a 
  mile 
  north 
  of 
  Easton 
  Corners, 
  up 
  to 
  and 
  for 
  half 
  a 
  

   mile 
  north 
  of 
  Argyle. 
  Throughout 
  its 
  extent 
  the 
  rocks 
  of 
  these 
  

   two 
  more 
  or 
  less 
  continuous 
  belts 
  have 
  been 
  highly 
  disturbed 
  by 
  

   dynamic 
  forces. 
  They 
  are 
  much 
  folded 
  and 
  crushed, 
  and 
  at 
  times 
  

   assume 
  a 
  very 
  slaty 
  structure. 
  The 
  limestone 
  is 
  generally 
  fine 
  

   grained 
  and 
  of 
  a 
  black 
  color, 
  is 
  traversed 
  by 
  numerous 
  veins 
  of 
  

   white 
  calcite 
  and 
  is 
  frequently 
  of 
  high 
  purity. 
  It 
  is 
  mined 
  at 
  

   Smiths 
  Basin 
  and 
  also 
  west 
  of 
  Fairhaven 
  near 
  the 
  Vermont 
  line. 
  

  

  At 
  both 
  of 
  these 
  localities 
  the 
  stone 
  has 
  been 
  quarried 
  for 
  lime 
  

   making 
  and 
  flux. 
  

  

  In 
  the 
  Mohawk 
  valley 
  only 
  the 
  Birdseye 
  and 
  Trenton 
  members 
  

   are 
  present. 
  

  

  