﻿LIMESTONES 
  OF 
  NEW 
  YORK 
  AND 
  THEIR 
  ECONOMIC 
  VALUE 
  361 
  

  

  The 
  Birdseye 
  member 
  is 
  in 
  greater 
  part 
  a 
  fine 
  grained, 
  dove 
  

   colored 
  stone, 
  and 
  weathers 
  light 
  gray, 
  and 
  the 
  beds 
  are 
  gen- 
  

   erally 
  moderately 
  heavy. 
  The 
  exposures 
  are 
  common 
  in 
  the 
  Mo- 
  

   hawk 
  valley 
  and 
  have 
  been 
  quarried 
  at 
  a 
  number 
  of 
  localities. 
  

   Underlying 
  this 
  rock 
  is 
  the 
  Calciferous 
  sandstone. 
  

  

  According 
  to 
  Darton 
  a 
  the 
  formation 
  reaches 
  its 
  maximum 
  

   thickness 
  at 
  Fort 
  Plain 
  where 
  it 
  is 
  about 
  nine 
  feet 
  thick. 
  It 
  

   then 
  decreases 
  westward 
  to 
  seven 
  feet 
  near 
  St 
  Johnsville. 
  It 
  is 
  

   five 
  feet 
  on 
  East 
  Canada 
  creek, 
  four 
  feet 
  around 
  Littlefalls 
  and 
  

   to 
  the 
  southeastward, 
  and 
  five 
  to 
  six 
  feet 
  on 
  West 
  Canada 
  creek 
  

   about 
  Middleville, 
  Newport 
  and 
  Cold 
  creek. 
  

  

  At 
  Ingham 
  Mills 
  the 
  rock 
  is 
  well 
  exposed 
  in 
  Butler 
  s 
  lime 
  

   quarry. 
  At 
  this 
  point 
  nearly 
  15 
  feet 
  of 
  a 
  good 
  grade 
  of 
  stone 
  is 
  

   exposed. 
  At 
  Canajoharie 
  the 
  Trenton 
  member 
  of 
  the 
  group 
  ap- 
  

   pears. 
  Excellent 
  exposures 
  occur 
  near 
  Amsterdam 
  and 
  at 
  Glens 
  

   Falls. 
  At 
  this 
  latter 
  locality 
  the 
  quarries 
  are 
  of 
  special 
  impor- 
  

   tance. 
  The 
  Trenton 
  limestone 
  member 
  is 
  found 
  extending 
  east- 
  

   ward 
  from 
  Oneida 
  cp. 
  to 
  Glens 
  Falls. 
  At 
  times 
  the 
  rock 
  is 
  

   massive 
  as 
  at 
  Tribeshill, 
  at 
  others 
  it 
  is 
  somewhat 
  shaly. 
  The 
  

   thickness 
  in 
  the 
  quarries 
  at 
  Tribeshill 
  is 
  12 
  to 
  14 
  feet 
  of 
  massive 
  

   stone. 
  Other 
  exposures 
  also 
  occur 
  in 
  the 
  quarries 
  about 
  Am- 
  

   sterdam 
  and 
  again 
  in 
  quarries 
  two 
  miles 
  northwest 
  of 
  Hoffmans 
  

   where 
  about 
  20 
  feet 
  of 
  a 
  soft, 
  highly 
  fossiliferous 
  limestone 
  is 
  

   exposed. 
  

  

  A 
  belt 
  of 
  Trenton 
  occurs 
  west 
  of 
  Saratoga 
  and 
  is 
  well 
  exposed 
  

   at 
  Howland's 
  mill 
  three 
  miles 
  due 
  west 
  — 
  southwest 
  from 
  Sara- 
  

   toga 
  Springs. 
  The 
  section 
  here 
  shows 
  20 
  feet 
  of 
  limestone. 
  

  

  At 
  Glens 
  Falls 
  the 
  Trenton 
  limestone 
  is 
  well 
  exposed 
  on 
  both 
  

   banks 
  of 
  the 
  Hudson, 
  and 
  is 
  of 
  much 
  importance, 
  being 
  used 
  for 
  

   building 
  stone 
  lime 
  and 
  portland 
  cement. 
  

  

  Darton 
  gives 
  the 
  following 
  section 
  of 
  it: 
  

  

  Thin-bedded 
  black 
  limestones 
  in 
  beds 
  3 
  to 
  8 
  in 
  10 
  feet 
  

  

  Black 
  marble 
  10 
  to 
  14 
  in. 
  beds 
  3 
  

  

  Black 
  marble 
  1 
  or 
  2 
  in. 
  beds 
  13 
  

  

  a 
  13th 
  an. 
  rep't 
  N. 
  Y. 
  state 
  geol. 
  1893, 
  p. 
  422, 
  

  

  