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  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  Eesidual 
  clays. 
  These 
  occur 
  in 
  the 
  western 
  half 
  of 
  the 
  state 
  

   west 
  of 
  the 
  line 
  passing 
  through 
  Weldon, 
  Raleigh 
  and 
  Rocking- 
  

   ham. 
  They 
  form 
  an 
  almost 
  universal 
  mantle 
  and 
  vary 
  in 
  thick- 
  

   ness 
  from 
  8 
  to 
  20 
  feet. 
  These 
  impure 
  residual 
  clays 
  are 
  gen- 
  

   erally 
  sandy 
  and 
  very 
  porous, 
  but 
  with 
  proper 
  machinery 
  and 
  

   treatment 
  they 
  yield 
  a 
  good 
  grade 
  of 
  brick. 
  

  

  The 
  residual 
  fire 
  clays 
  found 
  at 
  Pomona 
  and 
  Grover 
  are 
  coarse- 
  

   grained 
  clays 
  with 
  much 
  intermixed 
  quartz 
  and 
  mica. 
  

  

  The 
  kaolins 
  are 
  of 
  special 
  importance 
  and 
  of 
  eixcellent 
  quality^ 
  

   the 
  most 
  important 
  being 
  at 
  Webster, 
  and 
  west 
  of 
  Sylva. 
  

  

  Sedimentary 
  clays. 
  The 
  coastal 
  plain 
  deposits 
  of 
  I^orth 
  Caro- 
  

   lina 
  furnish 
  the 
  most 
  extensive 
  beds 
  of 
  clay 
  to 
  be 
  found 
  within 
  

   the 
  state. 
  They 
  have 
  been 
  classed 
  as 
  belonging 
  to 
  Cretaceous, 
  

   Eocene 
  and 
  Pleistocene 
  formations. 
  The 
  Potomac 
  clays 
  of 
  the 
  

   Cretaceous 
  are 
  exposed 
  at 
  Prospect 
  Hall 
  on 
  the 
  Cape 
  Fear 
  river, 
  

   and 
  the 
  Eocene 
  beds 
  are 
  well 
  shown 
  in 
  railroad 
  cuts 
  at 
  Spoutsprings 
  

   Eayetteville. 
  

  

  Many 
  clays 
  suitable 
  for 
  the 
  manufacture 
  of 
  brick 
  and 
  of 
  pot- 
  

   tery 
  are 
  found 
  underlying 
  the 
  river 
  terraces 
  farther 
  inland, 
  as 
  

   along 
  the 
  Catawba, 
  Yadkin, 
  and 
  the 
  Clark 
  rivers. 
  Other 
  sedi- 
  

   mentary 
  clays 
  are 
  well 
  developed 
  around 
  Wilson, 
  Goldsboro, 
  and 
  

   Eayetteville. 
  

  

  North 
  Dakota 
  

  

  The 
  clays 
  of 
  E'orth 
  Dakota 
  are 
  of 
  Cretaceous, 
  Tertiary, 
  and 
  Post- 
  

   tertiary 
  age, 
  and 
  abound 
  in 
  many 
  sections 
  of 
  the 
  state. 
  AYliile 
  they 
  

   are 
  suitable 
  for 
  a 
  variety 
  of 
  purposes, 
  they 
  have 
  thus 
  far 
  been 
  but 
  

   little 
  worked. 
  (Beport 
  of 
  commissioner 
  of 
  labor 
  and 
  agriculture, 
  

  

  1891-92) 
  

  

  Ohio^ 
  

  

  The 
  principal 
  centers 
  of 
  development 
  of 
  clays 
  are 
  in 
  most 
  in- 
  

   stances 
  the 
  same 
  as 
  those 
  which 
  furnish 
  the 
  coal. 
  The 
  Subcar- 
  

   boniferous 
  contains 
  valuable 
  deposits 
  of 
  flint 
  clay, 
  which 
  is 
  mined 
  

  

  1 
  Ohio 
  geol. 
  sur. 
  v. 
  7, 
  pt 
  1. 
  E. 
  Orton 
  jr. 
  Clays 
  and 
  clay-working 
  industries 
  

   of 
  Ohio. 
  

  

  