﻿10 
  ECONOMICAL 
  GEOLOGY. 
  

  

  ally 
  inferior 
  in 
  quality 
  to 
  that 
  obtained 
  from 
  the 
  Troy 
  shaft, 
  in 
  

   Madison 
  county. 
  A 
  bed 
  of 
  gray 
  limestone, 
  probably 
  the 
  Shoal 
  creek 
  

   rock, 
  was 
  found 
  in 
  this 
  shaft 
  immediately 
  below 
  the 
  surface 
  deposits, 
  

   which 
  were 
  here 
  only 
  about 
  25 
  feet 
  in 
  thickness. 
  

  

  At 
  Trenton 
  the 
  shaft 
  is 
  320 
  feet 
  in 
  depth 
  to 
  the 
  top 
  of 
  the 
  coal. 
  

   No 
  detailed 
  record 
  of 
  this 
  shaft 
  was 
  kept. 
  The 
  coal 
  is 
  live 
  feet 
  in 
  

   thickness, 
  and 
  of 
  excellent 
  quality, 
  and 
  is 
  said 
  to 
  bring 
  from 
  one 
  

   to 
  one 
  and 
  a 
  half 
  cents 
  per 
  bushel 
  more 
  in 
  the 
  St. 
  Louis 
  market 
  

   than 
  the 
  Collinsville 
  and 
  Caseyville 
  coals. 
  The 
  roof 
  shales 
  contain 
  

   Leaia 
  tricwrinata, 
  which 
  I 
  regard 
  as 
  a 
  characteristic 
  fossil 
  of 
  coal 
  

   No. 
  7. 
  

  

  At 
  Troy, 
  in 
  Madison 
  county, 
  the 
  shaft 
  is 
  315 
  feet 
  in 
  depth 
  to 
  the 
  

   top 
  of 
  the 
  coal. 
  The 
  seam 
  here 
  is 
  5i 
  feet 
  thick, 
  and 
  in 
  quality 
  it 
  

   is 
  equal 
  to 
  that 
  obtained 
  from 
  the 
  Trenton 
  shaft. 
  The 
  shale 
  over 
  

   the 
  coal 
  is 
  similar 
  to 
  that 
  at 
  Trenton, 
  and 
  contains 
  the 
  same 
  fossils. 
  

  

  The 
  Nashville 
  shaft, 
  in 
  Washington 
  county, 
  is 
  about 
  414 
  feet 
  in 
  

  

  depth 
  to 
  the 
  top 
  of 
  the 
  coal, 
  and 
  the 
  following 
  detailed 
  record 
  was 
  

  

  made: 
  In 
  

  

  No. 
  l. 
  Surface 
  clay 
  and 
  gravel 
  

  

  No. 
  a. 
  Bine 
  shale 
  • 
  

  

  No. 
  S. 
  Limestone 
  6 
  '' 
  

  

  No. 
  4. 
  Black 
  slate 
  4 
  

  

  No. 
  5. 
  Goal 
  (Jiiddle 
  slaty) 
  

  

  No. 
  6. 
  Clay 
  -halo 
  • 
  

  

  No. 
  7. 
  Sandstone 
  and 
  sandy 
  shale 
  M 
  

  

  No. 
  8. 
  Limestone 
  ° 
  

  

  No. 
  9. 
  Blue 
  shale 
  u 
  

  

  No. 
  l". 
  Pebbly 
  limestone 
  2 
  

  

  No. 
  11. 
  Black 
  slate 
  l 
  6 
  

  

  No. 
  12. 
  Fire-clay 
  

  

  No. 
  18. 
  Clay 
  shale 
  

  

  No. 
  ii. 
  Sandy 
  shale 
  and 
  sandstone 
  

  

  No. 
  IB. 
  I 
  Hue 
  shale 
  >1". 
  It 
  oiii 
  slaty 
  

  

  No. 
  16. 
  Goal 
  ' 
  

  

  No. 
  it. 
  Fire-clay 
  ' 
  

  

  No. 
  18. 
  l.im 
  nglomerate 
  ' 
  

  

  N... 
  19. 
  Sale 
  I 
  y 
  shale 
  

  

  No. 
  BO. 
  Bine 
  clay 
  shale 
  

  

  i. 
  Blank 
  shale 
  * 
  

  

  No. 
  lav 
  ' 
  8 
  

  

  No. 
  28. 
  Bine 
  -hale 
  ■ 
  

  

  lay 
  

  

  No. 
  25. 
  Lime 
  conglomerate 
  

  

  I'll" 
  elay 
  ' 
  

  

  Hard 
  limes! 
  me 
  ' 
  ' 
  "' 
  

  

  No. 
  B. 
  Blank 
  shall 
  

  

  Bine 
  pebbl] 
  shale, 
  . 
  . 
  

  

  " 
  

  

  No.81. 
  Fire-clay 
  l 
  6 
  

  

  