﻿Western 
  Pennsylvania. 
  

  

  205 
  

  

  Mahoning 
  or 
  the 
  Shenango 
  that 
  reveal 
  a 
  rock 
  surface 
  so 
  low 
  as 
  

   that 
  near 
  the 
  junction 
  of 
  these 
  streams, 
  as 
  may 
  be 
  seen 
  from 
  

   the 
  following 
  table 
  which 
  represents 
  the 
  deepest 
  borings 
  of 
  

   which 
  I 
  have 
  knowledge. 
  

  

  Table 
  showing 
  principal 
  borings 
  along 
  the 
  Mahoning- 
  Grand 
  

   River 
  route. 
  

  

  Location. 
  Distance. 
  Altitude. 
  Drift. 
  Rock 
  floor. 
  Authority. 
  

  

  Lawrence 
  Junct., 
  Pa. 
  miles. 
  760 
  feet. 
  150 
  feet. 
  610 
  feet. 
  White. 
  

  

  Edenburg. 
  Pa. 
  4"6 
  

  

  State 
  Line, 
  0. 
  and 
  Pa. 
  9 
  

  

  Lowellville, 
  O. 
  .10-3 
  

  

  Haselton, 
  near 
  Toungstown.. 
  15-6 
  

  

  Mies, 
  O. 
  26 
  

  

  Near 
  Soulhington, 
  0. 
  40 
  

  

  Mesopotamia, 
  0. 
  .47 
  

  

  Near 
  Rome 
  57*5 
  

  

  * 
  Given 
  in 
  letter 
  to 
  the 
  writer. 
  

  

  730 
  ' 
  

  

  200? 
  " 
  

  

  580? 
  ' 
  

  

  I 
  Lt 
  

  

  810 
  « 
  

  

  80 
  

  

  730 
  ' 
  

  

  1 
  Newberrj 
  

  

  826 
  ' 
  

  

  ? 
  " 
  

  

  \ 
  9 
  ' 
  

  

  

  831 
  ' 
  

  

  90 
  " 
  

  

  741 
  ' 
  

  

  ' 
  Foshay 
  * 
  

  

  854 
  ' 
  

  

  190 
  " 
  

  

  674 
  < 
  

  

  l 
  u 
  * 
  

  

  870 
  ' 
  

  

  222 
  + 
  " 
  

  

  648-' 
  

  

  ' 
  Leverett. 
  

  

  850 
  ' 
  

  

  208?" 
  

  

  642? 
  « 
  

  

  ' 
  " 
  

  

  820 
  ' 
  

  

  170 
  + 
  " 
  

  

  650—' 
  

  

  ' 
  | 
  " 
  

  

  The 
  thickness 
  of 
  drift 
  at 
  Edenburg 
  is 
  a 
  disputed 
  question, 
  

   some 
  citizens 
  maintaining 
  that 
  the 
  greatest 
  amount 
  penetrated 
  

   was 
  140 
  feet 
  where 
  the 
  level 
  of 
  the 
  well-mouth 
  was 
  12-20 
  feet 
  

   above 
  the 
  river, 
  while 
  others 
  hold 
  the 
  opinion 
  that 
  the 
  drift 
  

   extends 
  about 
  200 
  feet 
  below 
  the 
  river. 
  The 
  borings 
  were 
  

   made 
  nearly 
  thirty 
  years 
  ago, 
  and 
  no 
  records 
  are 
  known 
  to 
  have 
  

   been 
  preserved, 
  consequently 
  much 
  allowance 
  should 
  be 
  made 
  

   for 
  inaccuracies. 
  It 
  may 
  be 
  necessary 
  to 
  add 
  75 
  feet 
  to 
  denote 
  

   the 
  true 
  altitude 
  of 
  the 
  rock 
  floor 
  at 
  this 
  point. 
  However, 
  as 
  

   there 
  is 
  a 
  possibility 
  that 
  the 
  rock 
  floor 
  is 
  as 
  low 
  as 
  indicated 
  I 
  

   leave 
  it 
  as 
  given 
  by 
  Prof. 
  White 
  and 
  Mr. 
  Foshay. 
  

  

  The 
  borings 
  at 
  Niles, 
  Ohio 
  (No. 
  11, 
  on 
  map), 
  are 
  cited 
  by 
  

   Mr. 
  Foshay 
  as 
  fixing 
  the 
  position 
  of 
  the 
  old 
  channel 
  at 
  that 
  

   point, 
  if 
  northward 
  differential 
  uplift 
  be 
  taken 
  into 
  account. 
  

   The 
  amount 
  of 
  differential 
  uplift 
  required 
  if 
  the 
  rock 
  floor 
  is 
  

   but 
  580 
  feet 
  A. 
  T. 
  at 
  Edenburg, 
  is 
  7f 
  feet 
  per 
  mile, 
  allowing 
  

   the 
  stream 
  no 
  fall 
  between 
  Edenburg 
  (No. 
  14), 
  and 
  Niles 
  ; 
  

   and 
  9-f 
  feet 
  allowing 
  the 
  stream 
  a 
  fall 
  of 
  one 
  foot 
  per 
  mile, 
  

   Niles 
  being 
  1 
  2 
  miles 
  farther 
  north 
  than 
  Edenburg 
  and 
  about 
  

   22 
  miles 
  distant 
  by 
  the 
  stream, 
  while 
  the 
  valley 
  floor 
  there 
  is 
  

   94 
  feet 
  higher 
  than 
  at 
  Edenburg. 
  If 
  we 
  are 
  allowed 
  to 
  assume 
  

   an 
  uplift 
  of 
  9-f 
  feet 
  per 
  mile, 
  or 
  'even 
  of 
  7f 
  feet, 
  nearly 
  every 
  

   large 
  stream 
  tributary 
  to 
  the 
  Ohio 
  from 
  the 
  State 
  of 
  Ohio, 
  as 
  

   well 
  as 
  the 
  lower 
  Allegheny 
  and 
  the 
  Monongahela, 
  could 
  be 
  

   carried 
  into 
  the 
  Lake 
  Erie 
  basin, 
  and 
  we 
  could 
  if 
  we 
  saw 
  fit 
  

   attach 
  to 
  the 
  Lake 
  Erie 
  basin 
  all 
  the 
  southern 
  tributaries 
  of 
  

   the 
  Ohio 
  from 
  West 
  Yirginia 
  and 
  eastern 
  Kentucky. 
  

  

  