﻿48 
  ECONOMICAL 
  GEOLOGY. 
  

  

  on 
  Sugar 
  Creek, 
  in 
  Sangamon 
  county, 
  used 
  in 
  the 
  construction 
  of 
  

   the 
  Old 
  State 
  House 
  at 
  Springfield. 
  

  

  The 
  most 
  characteristic 
  fossils 
  of 
  this 
  limestone 
  are 
  Productiu 
  

   Nebrascensis, 
  P. 
  Prattcnianus, 
  P.punctatus, 
  Spirifer 
  camcratus, 
  Athyris 
  

   8iibtUita, 
  Pinna 
  per-acuta, 
  crinoidal 
  joints, 
  and, 
  rarely, 
  the 
  hody 
  of 
  a 
  

   Eupachycrinus 
  or 
  Poteriocrimis. 
  A 
  few 
  fish 
  teeth 
  and 
  spines 
  have 
  

   also 
  heen 
  obtained 
  from 
  this 
  limestone. 
  

  

  The 
  lower 
  division 
  of 
  the 
  limestone 
  No. 
  3 
  of 
  the 
  foregoing 
  section, 
  

   which 
  may 
  he 
  regarded 
  as 
  a 
  distinct 
  hed, 
  is 
  quite 
  argillaceous 
  and 
  

   of 
  but 
  little 
  value 
  as 
  a 
  building 
  stone. 
  It 
  is 
  unevenly 
  bedded, 
  and 
  

   the 
  layers 
  are 
  separated 
  by 
  shaly 
  partings, 
  that 
  are, 
  at 
  some 
  points, 
  

   completely 
  filled 
  with 
  fossil 
  shells. 
  The 
  fossils 
  of 
  this 
  limestone 
  are 
  

   Athyris 
  subtilita, 
  Terebratula 
  bovidens, 
  Spirifer 
  cameratus, 
  S. 
  lincatus, 
  

   Productus 
  longisp'uuis, 
  Spiriferina 
  Kentuckensw, 
  Platyostoma 
  Peorit 
  

   numerous 
  corals 
  not 
  yet 
  determined, 
  and 
  casts 
  of 
  Pleurotomaria, 
  

   Bellerophon 
  and 
  Nautilus 
  of 
  several 
  species. 
  

  

  I 
  have 
  been 
  inclined 
  to 
  regard 
  this 
  limestone 
  as 
  the 
  equivalent 
  of 
  

   that 
  at 
  Carlinville, 
  which 
  it 
  resembles, 
  both 
  in 
  its 
  lithological 
  char- 
  

   acters 
  and 
  in 
  the 
  specific 
  character 
  of 
  its 
  embedded 
  fossils. 
  If 
  so, 
  

   it 
  represents 
  the 
  horizon 
  of 
  No. 
  ( 
  .» 
  coal, 
  and 
  is 
  the 
  dividing 
  line 
  be- 
  

   tween 
  the 
  upper 
  and 
  lower 
  Coal 
  Measures. 
  It 
  is 
  rather 
  more 
  argil- 
  

   laceous 
  here 
  than 
  in 
  Macoupin 
  county, 
  but 
  otherwise 
  it 
  bears 
  a 
  close 
  

   resemblance 
  to 
  that 
  rock, 
  and 
  its 
  position 
  is 
  about 
  where 
  that 
  lime- 
  

   stone, 
  if 
  present 
  here, 
  should 
  be 
  found. 
  

  

  On 
  the 
  south 
  side 
  of 
  the 
  Illinois 
  river 
  there 
  are 
  two 
  or 
  three 
  ooal 
  

   shafts 
  in 
  operation, 
  only 
  one 
  of 
  which 
  had 
  any 
  reeord 
  of 
  the 
  beds 
  

   passed 
  through. 
  The 
  Oglesby 
  shaft 
  furnished 
  me 
  the 
  following 
  

   section 
  : 
  

  

  Ft. 
  In. 
  

   No, 
  1. 
  Drift 
  elay 
  mul 
  uravcl 
  

  

  No. 
  -. 
  Limestone, 
  In 
  two 
  beda 
  ii". 
  

  

  No. 
  3. 
  Shale 
  ; 
  

  

  No. 
  I. 
  ("ill 
  {i 
  2 
  

  

  No. 
  6. 
  Hhulo 
  ; 
  

  

  No. 
  6. 
  Hard 
  red 
  rook 
  4 
  I 
  

  

  N... 
  r. 
  Bhale 
  I 
  : 
  

  

  No. 
  8. 
  BanpBtone 
  4 
  n 
  

  

  No. 
  '.>. 
  Bed 
  shale 
  U 
  II 
  

  

  i". 
  Gray 
  shale 
  I 
  I 
  

  

  No. 
  11. 
  Limestone 
  

  

  u. 
  Bhale 
  It 
  >■ 
  

  

  i 
  ;. 
  Bard 
  rook 
  I 
  6 
  

  

  No 
  it. 
  Bhale 
  

  

  ' 
  14 
  li 
  

  

  :-> 
  

  

  17. 
  Black 
  slate 
  tl 
  : 
  

  

  ia 
  Ooal 
  No.71 
  

  

  