﻿618 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  brick 
  clay 
  has 
  been 
  developed 
  at 
  Cloverport, 
  and 
  in 
  Grayson 
  near 
  

   Millwood, 
  about 
  80 
  miles 
  from 
  Louisville, 
  it 
  being 
  worked 
  at 
  tbis 
  

   point 
  by 
  the 
  Lonisville 
  sewer 
  co. 
  

  

  Potters' 
  clay 
  is 
  found 
  chiefly 
  in 
  the 
  Tertiary 
  beds 
  which 
  are 
  

   found 
  in 
  the 
  Jackson 
  purchase. 
  This 
  region 
  includes 
  the 
  counties 
  

   of 
  Calloway, 
  G-raves, 
  Marshall, 
  Hickman, 
  Fulton, 
  Butler, 
  Edmon- 
  

   son, 
  Grayson, 
  Ohio 
  and 
  Madison. 
  The 
  best 
  developed 
  mi^.c^ 
  is 
  

   that 
  at 
  Pyorsburg, 
  6 
  miles 
  from 
  Mayfield 
  in 
  Graves 
  co. 
  ; 
  the 
  clay 
  

   at 
  this 
  point 
  is 
  over 
  40 
  feet 
  thick, 
  a 
  most 
  excellent 
  grade 
  of 
  ball 
  

   clay. 
  

  

  Glass 
  pot 
  clays 
  are 
  said 
  to 
  exist 
  in 
  Bell, 
  Marshall, 
  McC^acken, 
  

   Carlisle, 
  Hickman, 
  Fulton 
  and 
  Calloway 
  co., 
  but 
  their 
  value 
  has 
  

   not 
  yet 
  been 
  commercially 
  demonstrated. 
  

  

  Louisiana^ 
  

  

  The 
  iclsijs 
  of 
  Louisiana 
  are 
  all 
  Post-tertiary 
  and 
  sedimentary 
  in 
  

   their 
  origin. 
  There 
  are 
  no 
  important 
  residual 
  clays 
  in 
  the 
  state 
  

   except 
  in 
  one 
  very 
  small 
  area. 
  This 
  is 
  in 
  the 
  northeast 
  corner, 
  

   near 
  the 
  Arkansas 
  line. 
  Three 
  distinct 
  types 
  of 
  clay 
  are 
  worked 
  

   in 
  Louisiana, 
  each 
  being 
  characteristic 
  of 
  the 
  section 
  of 
  the 
  state 
  

   in 
  which 
  it 
  is 
  found. 
  The 
  oldest 
  of 
  these 
  geologically 
  is 
  the 
  mot- 
  

   tled 
  gray 
  clay 
  of 
  southeast 
  and 
  southwest 
  Louisiana. 
  These 
  clays 
  

   are 
  of 
  early 
  Columbian 
  age, 
  and 
  constitute 
  the 
  pine 
  flats 
  of 
  the 
  

   coast 
  and 
  the 
  second 
  bottoms 
  of 
  the 
  coastal 
  streams. 
  They 
  have 
  

   been 
  worked 
  for 
  a 
  long 
  time 
  locally 
  for 
  the 
  manufacture 
  of 
  com- 
  

   mon 
  building 
  brick. 
  But 
  only 
  in 
  the 
  last 
  few 
  years 
  have 
  they 
  

   been 
  utilized 
  on 
  a 
  large 
  scale. 
  

  

  The 
  next 
  important 
  group 
  of 
  clays 
  is 
  of 
  a 
  later 
  Columbian 
  age 
  

   and 
  is 
  found 
  above 
  the 
  alluvial 
  valley 
  of 
  the 
  modem 
  Mississippi 
  

   river. 
  They 
  form 
  a 
  continuous 
  bluff 
  overlooking 
  the 
  river 
  from 
  

   the 
  Mississippi 
  state 
  line 
  to 
  Baton 
  Kouge. 
  Thence 
  they 
  bear 
  south- 
  

   eastward 
  to 
  near 
  Lake 
  Maurepas. 
  These 
  clays 
  have 
  been 
  exten- 
  

  

  1 
  Engineering 
  journal. 
  15 
  Oct. 
  1898. 
  See 
  also 
  paper 
  by 
  H. 
  Ries 
  in 
  Isf 
  

   Ann. 
  rep't 
  La. 
  state 
  geologist. 
  

  

  