﻿46 
  ECONOMICAL 
  GEOLOGY. 
  

  

  I 
  refer 
  No. 
  16 
  in 
  this 
  shaft 
  to 
  the 
  horizon 
  of 
  coal 
  No. 
  7, 
  mainly 
  

   from 
  its 
  stratigraphical 
  position, 
  but 
  it 
  is 
  not 
  impossible 
  that 
  it 
  

   may 
  represent 
  No. 
  6 
  instead. 
  No 
  fossels 
  ware 
  found 
  in 
  connection 
  

   with 
  it. 
  at 
  tbe 
  only 
  outcrop 
  of 
  the 
  seam 
  I 
  was 
  enabled 
  to 
  examine, 
  

   and 
  hence 
  its 
  stratigraphical 
  position 
  is 
  the 
  only 
  evidence 
  that 
  was 
  

   available 
  for 
  its 
  identification. 
  The 
  outcrop 
  of 
  this 
  coal 
  was 
  found 
  

   in 
  a 
  deep 
  ravine, 
  just 
  below 
  the 
  uplift 
  at 
  Split 
  Rock, 
  where 
  an 
  

   opening 
  had 
  been 
  made 
  to 
  procure 
  the 
  potter's 
  clay, 
  which 
  forms 
  a 
  

   heavy 
  bed 
  immediately 
  below 
  the 
  coal. 
  

  

  Two 
  miles 
  and 
  a 
  half 
  north 
  of 
  La 
  Salle, 
  one 
  of 
  the 
  deepest 
  shafts 
  

   in 
  the 
  county 
  has 
  been 
  sunk 
  by 
  the 
  Caledonia 
  Coal 
  Company, 
  and 
  

   the 
  following 
  details 
  of 
  it 
  were 
  kindly 
  furnished 
  by 
  the 
  pit 
  boss, 
  Mr. 
  

   John 
  P. 
  Duncan 
  : 
  

  

  Ft 
  In. 
  

   No. 
  1. 
  Drift 
  clay 
  and 
  gravel 
  i:t 
  

  

  No. 
  2. 
  Green 
  and 
  purple 
  shales, 
  with 
  thin 
  bauds 
  of 
  impure 
  limestone 
  and 
  a 
  

  

  thin 
  coal 
  seam 
  60 
  

  

  No. 
  3. 
  Limestone, 
  in 
  two 
  beds 
  27 
  

  

  No. 
  4. 
  Blue, 
  green 
  and 
  gray 
  shales 
  ji;, 
  

  

  No. 
  5. 
  Black 
  slate 
  g 
  

  

  No. 
  6. 
  CoaINo.7(?) 
  4 
  

  

  No. 
  7. 
  Fire 
  and 
  potter's 
  clay 
  1,; 
  

  

  No. 
  8. 
  Clay 
  shale 
  14 
  

  

  No. 
  9. 
  OoalNo.6 
  3 
  ,-, 
  

  

  No. 
  10. 
  Fire-elay 
  - 
  

  

  No. 
  11. 
  Sandstone 
  5 
  

  

  No. 
  12, 
  Clay 
  shall' 
  54 
  

  

  No. 
  13. 
  Brown 
  shale 
  90 
  

  

  No. 
  14. 
  Black 
  slate 
  

  

  No. 
  16. 
  Sandstone 
  U 
  

  

  No. 
  16. 
  Blaok 
  slate 
  ■_> 
  

  

  No. 
  17. 
  Clay 
  shale 
  14 
  

  

  No. 
  18. 
  Coal 
  No. 
  2 
  ;< 
  1( 
  , 
  

  

  Total 
  depth 
  55a 
  4 
  

  

  The 
  lower 
  seam 
  is 
  the 
  one 
  worked 
  at 
  the 
  present 
  time, 
  in 
  this 
  

   shaft, 
  and 
  it 
  is 
  said 
  to 
  lie 
  underlaid 
  here 
  by 
  a 
  lied 
  of 
  excellent 
  lire 
  

   clay, 
  from 
  12 
  to 
  14 
  feet 
  in 
  thickness. 
  The 
  coal 
  which 
  it 
  affords 
  is 
  

   superior 
  in 
  quality 
  to 
  that 
  from 
  either 
  of 
  the 
  upper 
  srams. 
  

  

  The 
  beds 
  above 
  the 
  main 
  limestones. 
  No. 
  :; 
  of 
  the 
  Caledonia 
  

   shaft, 
  were 
  found 
  well 
  exposed, 
  in 
  the 
  big 
  cut 
  on 
  the 
  Illinois 
  Cen- 
  

   tral 
  railroad 
  north 
  of 
  the 
  zinc 
  works, 
  and 
  tin' 
  following 
  is 
  a 
  detailed 
  

  

  section 
  of 
  them 
  .as 
  they 
  appeared 
  ther< 
  

  

  1. 
  Qreen 
  ami 
  uh-gray 
  ''lav 
  shi 
  4 
  

  

  So. 
  '-'. 
  N'"ln'. 
  

  

  No. 
  [gfe 
  

  

  I. 
  impure 
  '■) 
  lati 
  

  

  Sed 
  ood 
  ffreen 
  ahal 
  in 
  

  

  No. 
  8, 
  (ip-i'ii. 
  -haly 
  .'lay 
  .. 
  ... 
  g 
  

  

  