﻿GEOLOGY. 
  273 
  

  

  in 
  the 
  Noxubee 
  Creek, 
  near 
  Macon, 
  renders 
  it 
  probable 
  

   that 
  there 
  is 
  a 
  formation 
  in 
  that 
  section 
  equivalent 
  to 
  

   the 
  Maestricht 
  beds, 
  separating 
  the 
  cretaceous 
  and 
  ter- 
  

   tiary 
  series, 
  this 
  reptile 
  belonging 
  to 
  the 
  former 
  group, 
  

   and 
  being 
  characteristic 
  of 
  the 
  beds 
  spoken 
  of 
  

  

  Further 
  investigations, 
  which 
  have 
  as 
  yet 
  been 
  prose- 
  

   cuted 
  only 
  to 
  a 
  limited 
  extent 
  in 
  that 
  quarter, 
  will 
  pro- 
  

   bably 
  reveal 
  some 
  of 
  the 
  characteristic 
  shells 
  usually 
  

   associated 
  with 
  these 
  remains, 
  and 
  which 
  are 
  common 
  

   neither 
  to 
  the 
  cretaceous 
  nor 
  to 
  the 
  tertiary. 
  

  

  Some 
  joints 
  of 
  the 
  vertebra 
  of 
  the 
  Mesosaurus, 
  from 
  

   the 
  lime 
  rock 
  excavated 
  from 
  the 
  cisterns 
  spoken 
  of, 
  are 
  

   plated 
  or 
  embossed 
  with 
  pyrites, 
  and 
  plates 
  of 
  the 
  shells 
  

   of 
  Chelonia 
  are 
  found 
  associated 
  with 
  them 
  in 
  a 
  similar 
  

   condition. 
  

  

  Following 
  up 
  these 
  organic 
  remains 
  in 
  the 
  order 
  of 
  

   succession, 
  those 
  of 
  the 
  Eocene 
  period 
  next 
  present 
  them- 
  

   selves, 
  and 
  at 
  no 
  point 
  yet 
  explored 
  more 
  conspicuously 
  

   than 
  at 
  Vicksburg. 
  

  

  Mr. 
  Conrad, 
  who 
  has 
  perhaps 
  bestowed 
  more 
  attention 
  

   upon 
  the 
  tertiary 
  fossils 
  of 
  the 
  United 
  States 
  than 
  most 
  

   of 
  our 
  geologists, 
  visited 
  that 
  locality 
  some 
  years 
  since, 
  

   and 
  devoted 
  several 
  weeks 
  to 
  researches 
  among, 
  these 
  re- 
  

   mains, 
  and 
  published 
  a 
  descriptive 
  catalogue 
  of 
  them 
  in 
  

   1848, 
  in 
  the 
  first 
  volume 
  of 
  the 
  second 
  series 
  of 
  the 
  

   Journal 
  of 
  the 
  Academy 
  of 
  Natural 
  Sciences, 
  Philadelphia. 
  

   He 
  enumerates 
  about 
  one 
  hundred 
  and 
  fifty 
  species, 
  

   many 
  of 
  which 
  he 
  found 
  to 
  be 
  new 
  and 
  undescribed, 
  and 
  

   most 
  of 
  which 
  he 
  has 
  accurately 
  figured. 
  

  

  Since 
  his 
  visit, 
  these 
  beds 
  have 
  been 
  traced 
  along 
  the 
  

   base 
  of 
  the 
  bluff" 
  range 
  above 
  Vicksburg, 
  as 
  high 
  as 
  St. 
  

   Peter's, 
  or 
  Hayne's 
  Bluff", 
  on 
  the 
  Yazoo, 
  which 
  has 
  resulted 
  

   in 
  the 
  discovery 
  of 
  a 
  few 
  others, 
  not 
  included 
  in 
  his 
  

   catalogue. 
  

   18 
  

  

  