﻿612 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  The 
  red 
  and 
  purple 
  clays 
  of 
  tlie 
  Tuscaloosa 
  formation 
  would 
  

   probably 
  also 
  make 
  a 
  good 
  vitrified 
  brick. 
  

  

  China 
  clays 
  and 
  stoneware 
  clays. 
  These 
  occur 
  in 
  the 
  counties 
  of 
  

   Randolph, 
  Clay, 
  Cleburne 
  and 
  others, 
  and 
  are 
  sedimentary. 
  

  

  Among 
  the 
  residual 
  deposits 
  of 
  the 
  Cambrian 
  and 
  Sikirian 
  for- 
  

   mations 
  are 
  large 
  beds 
  of 
  white 
  clay, 
  which 
  are 
  sometimes 
  associated 
  

   with 
  limonite 
  beds, 
  as 
  at 
  Rockrun. 
  

  

  The 
  subcarboniferous 
  formation 
  contains 
  some 
  good 
  deposits 
  of 
  

   white 
  burning 
  clay, 
  near 
  Fort 
  Payne, 
  Valleyhead, 
  etc. 
  

  

  In 
  the 
  Cretaceous 
  formation 
  are 
  important 
  beds 
  of 
  clays 
  of 
  vari- 
  

   ous 
  qualities, 
  which 
  outcrop 
  in 
  a 
  belt 
  extending 
  from 
  Columbus, 
  

   Ga., 
  into 
  the 
  northwest 
  corner 
  of 
  the 
  state. 
  

  

  Fire 
  clays 
  occur 
  and 
  are 
  mined 
  at 
  Woodstock, 
  Bibbville^ 
  Oxford, 
  

  

  etc. 
  

  

  ArJcansas 
  

  

  In 
  the 
  Mesozoic 
  regions 
  of 
  Arkansas 
  are 
  found 
  a 
  great 
  variety 
  

   of 
  clays. 
  Those 
  occurring 
  within 
  the 
  Tertiary 
  region 
  have 
  been 
  

   used 
  for 
  the 
  manufacture 
  of 
  pottery, 
  but 
  the 
  Cretaceous 
  clays 
  have 
  

   not 
  yet 
  been 
  employed 
  for 
  this 
  purpose. 
  Kaolin 
  is 
  said 
  to 
  occur 
  

   in 
  Pike, 
  Pulaski, 
  Saline, 
  and 
  Ouachita 
  co., 
  but 
  the 
  beds 
  are 
  seldom 
  

   over 
  2 
  feet 
  in 
  thickness. 
  (ArA*. 
  geol. 
  sur. 
  1888. 
  5: 
  11) 
  

  

  The 
  deposits 
  of 
  Pulaski 
  co. 
  are 
  the 
  only 
  ones 
  of 
  those 
  above 
  men- 
  

   tioned 
  that 
  are 
  true 
  kaolins, 
  the 
  others 
  being 
  white 
  burning 
  sedi- 
  

   mentary 
  clays. 
  Good 
  brick 
  clays 
  are 
  found 
  in 
  all 
  second 
  bottom 
  

   streams, 
  and 
  bricks 
  are 
  made 
  at 
  Little 
  Rock, 
  Texarkana, 
  Arkadel- 
  

   phia, 
  etc. 
  Paving 
  bricks 
  are 
  made 
  at 
  Fort 
  Smith. 
  

  

  Colorado^ 
  

  

  The 
  clay-bearing 
  formation 
  of 
  Colorado 
  may 
  be 
  roughly 
  divided 
  

   into 
  the 
  following 
  three 
  groups: 
  

  

  1 
  Loess, 
  and 
  alluvial 
  deposits 
  

  

  2 
  Jura-Trias, 
  and 
  Cretaceous 
  

  

  3 
  Tertiary 
  clays 
  

  

  1 
  H. 
  Ries. 
  T. 
  A. 
  I. 
  M. 
  E. 
  1897, 
  p. 
  330. 
  

  

  