﻿GEOLOGY. 
  219 
  

  

  tion. 
  I 
  learned, 
  however, 
  from 
  Mr. 
  Tucker, 
  who 
  lives 
  

   in 
  the 
  neighborhood, 
  that 
  there 
  is 
  another 
  similar 
  group 
  

   on 
  another 
  stream 
  in 
  the 
  same 
  vicinity. 
  

  

  About 
  a 
  mile 
  east 
  of 
  Ripley, 
  in 
  the 
  same 
  county, 
  I 
  was 
  

   shown 
  a 
  small 
  bed 
  of 
  calcareous 
  sandstone 
  containing 
  a 
  

   variety 
  of 
  shells, 
  among 
  them 
  the 
  turretella 
  and 
  cere- 
  

   thium, 
  the 
  latter 
  of 
  a 
  large 
  size, 
  the 
  cavities 
  of 
  the 
  shells 
  

   being 
  frequently 
  filled 
  with 
  a 
  drusy 
  spar. 
  It 
  is 
  rather 
  

   cellular, 
  occasioned 
  by 
  the 
  decomposition 
  of 
  the 
  fossils, 
  

   and 
  contains 
  some 
  minute 
  shark's 
  teeth. 
  It 
  is 
  probably 
  

   the 
  rock 
  spoken 
  of 
  by 
  some 
  as 
  a 
  species 
  of 
  the 
  millstone 
  

   grit. 
  

  

  FERRUGINOUS 
  SANDSTONE— 
  IRON. 
  

  

  The 
  most 
  generally 
  distributed 
  form 
  of 
  silicious 
  rocks 
  

   is 
  the 
  iron 
  sandstone 
  in 
  its 
  various 
  conditions. 
  

  

  From 
  the 
  thin 
  plates 
  or 
  sheets 
  resembling 
  pot 
  metal, 
  

   to 
  the 
  coarser 
  and 
  more 
  massive 
  forms, 
  it 
  is 
  met 
  with 
  in 
  

   most 
  parts 
  of 
  the 
  State. 
  

  

  In 
  several 
  of 
  the 
  counties 
  where 
  this 
  rock 
  is 
  conve- 
  

   nient 
  and 
  abundant, 
  and 
  in 
  blocks 
  of 
  sufficient 
  dim.en- 
  

   sions, 
  it 
  has 
  been 
  used 
  for 
  the 
  base 
  or 
  foundation 
  of 
  the 
  

   court-houses 
  and 
  other 
  public 
  buildings, 
  and 
  occasionally 
  

   chimneys 
  have 
  been 
  constructed 
  of 
  it. 
  

  

  On 
  some 
  of 
  the 
  head 
  branches 
  of 
  Coles 
  Creek, 
  in 
  

   Adams 
  Count}^, 
  it 
  is 
  seen 
  in 
  considerable 
  quantities. 
  

  

  In 
  Pike 
  County, 
  it 
  is 
  found 
  a 
  short 
  distance 
  below 
  

   Holmesville, 
  forming 
  a 
  bluff 
  bank 
  on 
  Bogue 
  Chitto, 
  

   piled 
  up 
  to 
  the 
  height 
  of 
  ten 
  or 
  twelve 
  feet. 
  

  

  In 
  Leake 
  County, 
  the 
  road 
  leading 
  to 
  Columbus 
  crosses 
  

   a 
  considerable 
  ridge, 
  on 
  which 
  it 
  abounds, 
  as 
  it 
  does 
  also 
  

   near 
  De 
  Kalb, 
  in 
  Kemper 
  County. 
  

  

  