﻿818 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  and 
  south 
  of 
  the 
  pit. 
  The 
  one 
  objection 
  to 
  the 
  deposit 
  is 
  that 
  the 
  

   clay 
  is 
  overlain 
  by 
  about 
  20 
  feet 
  of 
  yellow 
  gravel 
  and 
  drift, 
  which 
  

   has 
  caused 
  much 
  trouble 
  at 
  times 
  by 
  caving. 
  It 
  would 
  seem 
  that 
  

   underground 
  workings 
  could 
  be 
  established, 
  which 
  would 
  be 
  more 
  

   permanent. 
  A 
  number 
  of 
  pits 
  have 
  been 
  sunk 
  in 
  the 
  clay, 
  many 
  

   30 
  feet 
  in 
  depth, 
  the 
  usual 
  diameter 
  being 
  10 
  feet. 
  This 
  clay 
  has 
  

   been 
  used 
  for 
  a 
  variety 
  of 
  products, 
  such 
  as 
  architectural 
  terra 
  

   cotta, 
  common 
  stoneware, 
  chemical 
  stoneware 
  and 
  clay 
  pipes. 
  

  

  The 
  clay, 
  which 
  was 
  of 
  a 
  dark 
  gray 
  color, 
  was 
  very 
  plastic 
  and 
  

   •often 
  quite 
  smooth. 
  At 
  the 
  time 
  the 
  samples 
  for 
  physical 
  work 
  

   were 
  collected 
  the 
  bank 
  had 
  caved 
  in 
  and 
  no 
  specimens 
  were 
  ob- 
  

   tainable, 
  but 
  the 
  following 
  is 
  an 
  analysis 
  of 
  it 
  made 
  by 
  Dr 
  H. 
  C. 
  

   ^owen 
  on 
  a 
  sample 
  collected 
  some 
  years 
  ago. 
  

  

  Silica 
  76.50 
  

  

  Alumina 
  15 
  . 
  17 
  

  

  Ferrous 
  oxid 
  , 
  1.34 
  

  

  Lime 
  .59 
  

  

  Magnesia 
  .11 
  

  

  :Soda 
  81 
  

  

  Potash 
  127 
  

  

  Phosphoric 
  acid 
  .07 
  

  

  Moisture 
  .12 
  

  

  Water 
  (combined) 
  4.27 
  

  

  Glencove. 
  Carpenter 
  Bros, 
  have 
  a 
  bed 
  of 
  stoneware 
  clay, 
  fire 
  

   -sand 
  and 
  kaolin 
  on 
  the 
  east 
  side 
  of 
  Hempstead 
  harbor. 
  The 
  

   clay 
  is 
  of 
  a 
  white 
  and 
  pink 
  color, 
  the 
  layers 
  being 
  4 
  inches 
  to 
  1 
  

   foot 
  thick, 
  interstratified 
  with 
  layers 
  of 
  quartz 
  pebbles. 
  ]N^earer 
  the 
  

   shore 
  this 
  dips 
  under 
  a 
  bed 
  of 
  the 
  clay 
  free 
  from 
  pebbles. 
  Asso- 
  

   ciated 
  with 
  the 
  clay 
  is 
  a 
  deposit 
  of 
  kaolin 
  and 
  fire 
  sand. 
  The 
  clay 
  

   burns 
  a 
  cream 
  color. 
  The 
  quartz 
  pebbles, 
  which 
  contain 
  small 
  

   cracks, 
  crumble 
  easily 
  and 
  seem 
  to 
  have 
  been 
  subjected 
  to 
  the 
  action 
  

   of 
  some 
  alkaline 
  solution.-^ 
  When 
  ground 
  they 
  can 
  be 
  used 
  for 
  the 
  

   £nest 
  grades 
  of 
  pottery 
  and 
  stoneware. 
  The 
  fire 
  sand 
  and 
  kaolin 
  

   are 
  screened 
  and 
  sold 
  according 
  to 
  grade. 
  

   'F. 
  J. 
  H. 
  Merrill. 
  "Geology 
  of 
  Long 
  Island" 
  Ana. 
  N. 
  Y. 
  acud. 
  sci. 
  1^84. 
  

  

  