﻿LaSALLE 
  COUNTY. 
  45 
  

  

  ing 
  a 
  larger 
  investment 
  of 
  capital 
  to 
  reach 
  it, 
  it 
  has 
  generally 
  been 
  

   neglected 
  where 
  the 
  upper 
  seams 
  were 
  developed. 
  In 
  McDonough 
  

   county, 
  where 
  its 
  average 
  thickness 
  scarcely 
  exceeds 
  two 
  feet, 
  it 
  

   has 
  furnished 
  the 
  main 
  supply 
  of 
  coal 
  for 
  the 
  city 
  of 
  Quincy, 
  in- 
  

   cluding 
  the 
  river 
  trade 
  at 
  that 
  point 
  for 
  the 
  past 
  twenty-five 
  years, 
  

   and 
  will 
  no 
  doubt 
  continue 
  to 
  do 
  so 
  for 
  at 
  least 
  another 
  decade. 
  

  

  The 
  aggregate 
  thickness 
  of 
  the 
  Coal 
  Measures 
  on 
  the 
  east 
  side 
  of 
  

   the 
  axis, 
  heretofore 
  mentioned, 
  probably 
  does 
  not 
  much 
  exceed 
  200 
  

   feet, 
  and 
  the 
  distance 
  between 
  coals 
  No. 
  2 
  and 
  7 
  is 
  about 
  80 
  feet, 
  

   while 
  on 
  the 
  west 
  side 
  the 
  distance 
  between 
  these 
  coals 
  is 
  about 
  

   200 
  feet, 
  and 
  the 
  entire 
  thickness 
  of 
  the 
  Coal 
  Measures 
  may 
  be 
  es- 
  

   timated 
  at 
  over 
  600 
  feet. 
  This 
  variation 
  in 
  the 
  thickness 
  of 
  this 
  

   formation 
  is 
  probably 
  in 
  part 
  due 
  to 
  the 
  rapid 
  thinning 
  out 
  of 
  the 
  

   beds 
  towards 
  the 
  eastern 
  border 
  of 
  the 
  coal 
  field, 
  and 
  in 
  part 
  to 
  

   erosion 
  which 
  has 
  carried 
  away 
  on 
  the 
  eastern 
  side 
  nearly 
  all 
  the 
  

   strata 
  above 
  the 
  horizon 
  of 
  No. 
  7 
  coal. 
  

  

  The 
  details 
  of 
  the 
  following 
  section 
  of 
  the 
  Union 
  Coal 
  company's 
  

   shaft, 
  at 
  LaSalle, 
  was 
  furnished 
  by 
  Mr. 
  Chas. 
  J. 
  Devlin, 
  the 
  acting 
  

   Secretary 
  of 
  the 
  company. 
  This 
  shaft 
  is 
  located 
  in 
  the 
  south 
  part 
  

   of 
  the 
  city, 
  and 
  commences 
  below 
  the 
  main 
  limestones 
  that 
  outcrop 
  

   along 
  the 
  river 
  bluffs 
  from 
  LaSalle 
  to 
  Peru. 
  

  

  Ft. 
  In. 
  

  

  No. 
  1. 
  Clayshale 
  11 
  

  

  No. 
  2. 
  Brown 
  shale 
  11 
  

  

  No. 
  3. 
  Coal 
  1 
  

  

  No. 
  4. 
  Brownshale 
  20 
  

  

  No. 
  5. 
  Hard 
  limestone 
  3 
  

  

  No. 
  6. 
  Shale 
  10 
  

  

  No. 
  7. 
  Bock 
  1 
  

  

  No. 
  8. 
  Shale 
  12 
  

  

  No. 
  9. 
  Fire-clay 
  6 
  

  

  No. 
  10. 
  Bock 
  3 
  

  

  No. 
  11. 
  Fire-clay 
  12 
  

  

  No. 
  12. 
  Pebbly 
  clay 
  4 
  6 
  

  

  No. 
  13. 
  Clayshale 
  10 
  6 
  

  

  No. 
  14. 
  Blackslate 
  10 
  

  

  No. 
  15. 
  Clay 
  shale 
  or 
  fire-clay 
  15 
  

  

  No. 
  16. 
  Coal,No.7(?) 
  4 
  

  

  No. 
  17. 
  Fire-clay 
  and 
  clay 
  shale 
  24 
  

  

  No. 
  18. 
  Sandstone 
  2 
  

  

  No. 
  19. 
  Black 
  shale 
  13 
  

  

  No. 
  20. 
  Coal, 
  No. 
  5 
  5 
  

  

  No. 
  21. 
  Clayshale 
  60 
  

  

  No. 
  22. 
  Limestone 
  5 
  

  

  No. 
  23. 
  Shale, 
  with 
  some 
  limestone 
  71 
  

  

  No. 
  24. 
  Dove 
  colored 
  shale 
  12 
  

  

  No. 
  25. 
  Coal,No.2 
  4 
  

  

  Total 
  depth 
  330 
  

  

  