﻿572 
  NEW 
  YORK 
  STxlTE 
  MUSEUM 
  

  

  GEOLOGIC 
  DISTKIBUTION 
  

  

  C'lajs 
  or 
  shales 
  occur 
  in 
  every 
  geologic 
  formation 
  even 
  in 
  the 
  

   archean. 
  It 
  can 
  be 
  said 
  in 
  general 
  that 
  all 
  those 
  which 
  are 
  older 
  

   than 
  the 
  Cretaceous 
  are 
  shale, 
  while 
  those 
  of 
  Cretaceous 
  and 
  Ter- 
  

   tiary 
  age 
  are 
  sometimes 
  soft 
  plastic 
  clays, 
  as 
  those 
  of 
  New 
  Jersey 
  

   * 
  and 
  Long 
  Island, 
  or 
  at 
  times 
  shales, 
  as 
  exampled 
  by 
  the 
  fire 
  clays 
  of 
  

   Colorado. 
  

  

  The 
  Quaternary 
  deposits 
  of 
  clay 
  are 
  all 
  unconsolidated, 
  so 
  far 
  

   as 
  known, 
  no 
  shales 
  occurring 
  in 
  this 
  formation. 
  

  

  The 
  geologic 
  age 
  of 
  a 
  claj 
  or 
  shale 
  is 
  no 
  indication 
  of 
  its 
  com- 
  

   mercial 
  value, 
  except 
  at 
  most 
  for 
  the 
  comparison 
  of 
  two 
  deposits 
  

   in 
  closely 
  adjoining 
  areas, 
  but 
  even 
  here 
  it 
  is 
  not 
  safe 
  to 
  rely 
  on 
  

   such 
  a 
  guide. 
  

  

  Those 
  deposits 
  which 
  are 
  of 
  marine 
  origin 
  are 
  commonly 
  much 
  

   more 
  extensive 
  than 
  those 
  formed 
  in 
  inland 
  waters. 
  

  

  Occurrence 
  of 
  clay 
  in 
  New 
  York 
  state 
  

  

  Deposits 
  of 
  clay 
  or 
  shale 
  are 
  to 
  be 
  found 
  in 
  nearly 
  every 
  county 
  

   of 
  the 
  state. 
  They 
  are 
  divisible 
  into 
  the 
  following 
  classes. 
  

  

  1 
  Residual 
  clays 
  Soft 
  plastic 
  clays 
  

  

  2 
  Sedimentary 
  clays 
  Shales 
  or 
  consolidated 
  clayti 
  

  

  1 
  Residual 
  clays. 
  Deposits 
  of 
  this 
  type 
  are 
  rare 
  in 
  glaciated 
  

   regions; 
  still 
  several 
  small 
  kaolin 
  veins 
  have 
  been 
  found 
  to 
  the 
  

   east 
  and 
  southeast 
  of 
  Sharon 
  Station 
  on 
  the 
  New 
  York 
  & 
  Harlem 
  

   railroad, 
  but 
  it 
  is 
  doubtful 
  if 
  they 
  will 
  ever 
  become 
  of 
  commercial 
  

   importance. 
  They 
  are 
  also 
  found 
  in 
  the 
  adjoining 
  portion 
  of 
  Con- 
  

   necticut, 
  one 
  being 
  worked 
  4 
  miles 
  east 
  of 
  Sharon. 
  Residual 
  

   clays 
  also 
  occur 
  in 
  association 
  with 
  the 
  limonite 
  deposits 
  at 
  

   Amenia, 
  and 
  in 
  the 
  vicinity 
  of 
  JSTew 
  York 
  city 
  the 
  dolomitic 
  lime- 
  

   stones 
  hate 
  by 
  their 
  decomposition 
  sometimes 
  given 
  rise 
  to 
  clays 
  

   of 
  a 
  residual 
  nature. 
  

  

  