﻿620 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  Massachusetts^ 
  

  

  The 
  clays 
  are 
  mostly 
  Quaternary, 
  suitable 
  for 
  brick 
  manufac- 
  

   ture, 
  and 
  are 
  extensively 
  dug 
  around 
  Boston 
  for 
  brickmaking. 
  

   Kaolin 
  is 
  mined 
  at 
  Blandford, 
  and 
  in 
  the 
  western 
  part 
  of 
  the 
  state 
  

   buff 
  burning 
  clays 
  occur 
  which 
  are 
  adapted 
  to 
  the 
  manufacture 
  of 
  

   buff 
  brick 
  and 
  terra 
  cotta: 
  

  

  Refractory 
  wares 
  and 
  art 
  pottery 
  are 
  made 
  near 
  Boston 
  from 
  

   clays 
  mined 
  in 
  other 
  states. 
  

  

  Michigan^ 
  

  

  The 
  clay-working 
  industry 
  of 
  Michigan 
  has 
  not 
  been 
  developed 
  

   to 
  any 
  extent 
  except 
  in 
  the 
  line 
  of 
  common 
  brick 
  manufacture. 
  

   Much 
  of 
  the 
  state 
  is 
  covered 
  with 
  glacial 
  drift; 
  local 
  beds 
  of 
  clay 
  

   are 
  found 
  in 
  connection 
  with 
  this. 
  In 
  this 
  glacial 
  formation 
  the 
  

   lowest 
  ia 
  the 
  blue 
  gravely 
  clay 
  from 
  7 
  to 
  12 
  feet 
  thick, 
  which 
  is 
  

   utilized 
  at 
  Springswell, 
  near 
  Detroit, 
  also 
  in 
  Ottawa, 
  Allegan 
  and 
  

   Barry 
  co. 
  The 
  products 
  of 
  this 
  clay 
  are 
  red, 
  sand-molded, 
  

   white, 
  machine-pressed, 
  red, 
  machine-pressed, 
  and 
  sewer 
  bricks. 
  

   The 
  clays 
  of 
  the 
  extreme 
  northern 
  part 
  of 
  the 
  lower 
  peninsula 
  of 
  

   Michigan 
  have 
  too 
  much 
  lime 
  to 
  be 
  of 
  any 
  great 
  commercial 
  value, 
  

   but 
  are 
  used 
  locally 
  to 
  some 
  extent. 
  

  

  At 
  Coldwater 
  all 
  the 
  clays 
  are 
  used 
  for 
  cement 
  manufacture. 
  

   Ship 
  clay 
  is 
  found 
  at 
  Rockland 
  and 
  Luther. 
  

  

  The 
  shales 
  associated 
  with 
  the 
  coal 
  seams 
  are 
  suitable 
  in 
  many 
  

   cases 
  for 
  making 
  paving 
  brick 
  or 
  stoneware, 
  and 
  some 
  may 
  be 
  semi- 
  

   refractory. 
  

  

  Mississippi 
  

  

  The 
  Eocene 
  and 
  Miocene 
  are 
  the 
  most 
  important 
  clay-producing 
  

   horizons 
  in 
  this 
  state 
  but 
  beds 
  of 
  good 
  quality 
  also 
  occur 
  in 
  the 
  

   Carboniferous 
  and 
  Cretaceous. 
  The 
  clays 
  have 
  been 
  but 
  little 
  used 
  

   except 
  for 
  the 
  manufacture 
  of 
  common 
  brick 
  and 
  the 
  lower 
  grades 
  

   of 
  pottery. 
  (Geology 
  of 
  Mississippi. 
  1860) 
  

  

  1 
  C. 
  L. 
  Whittle. 
  " 
  Clay 
  industry 
  of 
  Massachusetts." 
  Min. 
  Ind. 
  7: 
  125. 
  

   » 
  E. 
  and 
  M. 
  J. 
  29 
  Aug. 
  1898. 
  Also 
  paper 
  on 
  Michigan 
  shales 
  by 
  H. 
  Ries 
  in 
  

   Michigan 
  miner 
  for 
  1899. 
  

  

  