﻿124 
  D. 
  D. 
  Condlt 
  — 
  Deep 
  Wells 
  at 
  Findlay, 
  Ohio. 
  

  

  well 
  record, 
  with 
  depths 
  adjusted 
  so 
  as 
  to 
  coincide 
  with 
  those 
  

   in 
  the 
  Norris 
  well. 
  This 
  seems 
  permissible, 
  for 
  the 
  distance 
  

   between 
  the 
  two 
  wells 
  is 
  only 
  a 
  few 
  miles. 
  The 
  question 
  as 
  to 
  

   the 
  age 
  and 
  relations 
  of 
  the 
  various 
  beds 
  was 
  discussed 
  with 
  

   Dr. 
  E. 
  O. 
  Ulrich, 
  of 
  the 
  U. 
  S. 
  Geological 
  Survey, 
  and 
  the 
  cor- 
  

   relations 
  used 
  in 
  the 
  section 
  are 
  those 
  suggested 
  by 
  him, 
  adapted 
  

   to 
  the 
  nomenclature 
  and 
  classification 
  in 
  current 
  use 
  by 
  the 
  

   TJ. 
  S. 
  Geological 
  Survey. 
  

  

  Limestone 
  of 
  Niagaran 
  age 
  forms 
  the 
  surface 
  in 
  the 
  vicinity 
  

   of 
  Findlay. 
  This 
  is 
  generally 
  covered 
  with 
  10 
  to 
  100 
  feet 
  of 
  

   glacial 
  drift. 
  In 
  the 
  Grubb 
  well 
  this 
  limestone 
  was 
  found 
  311 
  

   feet 
  thick. 
  The 
  underlying 
  strata 
  in 
  descending 
  order 
  are 
  

   shale 
  and 
  brownish 
  gray 
  limestone 
  of 
  either 
  Clinton 
  or 
  upper 
  

   Medina 
  (Ohio 
  "Clinton") 
  age; 
  then 
  gray 
  and 
  red 
  shale, 
  prob- 
  

   ably 
  to 
  be 
  correlated 
  with 
  the 
  lower 
  Medina 
  on 
  the 
  one 
  hand 
  

   and 
  the 
  Richmond 
  on 
  the 
  other, 
  underlain 
  in 
  turn 
  by 
  gray 
  and 
  

   brown 
  shales 
  with 
  a 
  thickness 
  of 
  732 
  feet, 
  representing 
  the 
  

   lower 
  formations 
  of 
  the 
  Cincinnatian 
  series. 
  The 
  top 
  of 
  the 
  

   oil-bearing 
  limestone, 
  generally 
  known 
  as 
  Trenton, 
  was 
  struck 
  

   at 
  1165 
  feet 
  and 
  the 
  drill 
  continued 
  in 
  limestone 
  and 
  shaly 
  

   beds, 
  probably 
  of 
  Black 
  River, 
  Lowville, 
  and 
  Stones 
  River 
  age, 
  

   to 
  a 
  depth 
  of 
  1894 
  feet, 
  giving 
  a 
  thickness 
  of 
  729 
  feet 
  for 
  these 
  

   strata. 
  Then 
  comes 
  406 
  feet 
  of 
  white, 
  granular 
  quartzose 
  lime- 
  

   stone 
  and 
  sandstone, 
  all 
  of 
  which 
  probably 
  represents 
  St. 
  Peter 
  

   sandstone. 
  At 
  1135 
  feet 
  below 
  the 
  top 
  of 
  the 
  "Trenton 
  " 
  is 
  a 
  

   dark, 
  glauconitic, 
  dolomitic 
  limestone 
  60 
  feet 
  thick 
  that 
  is 
  re- 
  

   ferred 
  to 
  the 
  Upper 
  Cambrian. 
  Beneath 
  this 
  is 
  garnetiferous, 
  ark- 
  

   osic 
  sandstone, 
  which 
  was 
  penetrated 
  only 
  .10 
  feet 
  in 
  the 
  Grubb 
  

   well. 
  Its 
  thickness, 
  as 
  shown 
  by 
  the 
  Norris 
  record, 
  is 
  395 
  feet. 
  

   All 
  of 
  it 
  is 
  probably 
  Upper 
  Cambrian. 
  At 
  the 
  base 
  of 
  the 
  

   sandstone 
  is 
  15 
  feet 
  of 
  red, 
  green, 
  and 
  gray 
  clay, 
  which 
  rests 
  

   upon 
  granite. 
  Drilling 
  was 
  discontinued 
  after 
  the 
  granite 
  had 
  

   been 
  penetrated 
  to 
  a 
  depth 
  of 
  210 
  feet.* 
  

  

  * 
  The 
  "Trenton" 
  limestone 
  was 
  found 
  at 
  a 
  depth 
  of 
  1165 
  feet 
  in 
  the 
  

   Norris 
  well, 
  and 
  the 
  base 
  of 
  the 
  garnetiferous 
  sandstone 
  (bottom 
  of 
  the 
  

   Grubb 
  well) 
  at 
  2755 
  feet. 
  As 
  has 
  already 
  been 
  stated, 
  no 
  samples 
  were 
  

   saved 
  in 
  this 
  portion 
  of 
  the 
  well, 
  but 
  the 
  drillers 
  report 
  a 
  uniform, 
  gray 
  

   grit 
  throughout 
  the 
  interval. 
  The 
  belief 
  that 
  the 
  lower 
  395 
  feet 
  of 
  the 
  sec- 
  

   tion 
  is 
  entirely 
  sandstone 
  is 
  corroborated 
  by 
  the 
  mineralogical 
  examination 
  

   of 
  samples 
  collected 
  from 
  the 
  sand 
  cone 
  back 
  of 
  the 
  derrick 
  where 
  the 
  pump- 
  

   ings 
  were 
  dumped. 
  A 
  cut 
  was 
  made 
  through 
  this 
  cone 
  and 
  thus 
  a 
  condensed 
  

   section 
  showing 
  the 
  principal 
  beds 
  in 
  inverted 
  order 
  was 
  obtained. 
  Imme- 
  

   diately 
  underneath 
  the 
  granite 
  drillings 
  were 
  the 
  thin 
  films 
  of 
  gray, 
  green 
  

   and 
  red 
  clay, 
  mentioned 
  ; 
  then 
  came 
  several 
  inches 
  of 
  rusty 
  gray 
  sand 
  which 
  

   corresponds 
  to 
  the 
  thick 
  Upper 
  Cambrian 
  sandstone. 
  The 
  greater 
  part 
  of 
  

   this 
  was 
  clean 
  and 
  contained 
  a 
  few 
  accessory 
  minerals. 
  A 
  little 
  deeper 
  in 
  

   the 
  sand 
  cone 
  was 
  a 
  dark 
  band 
  which 
  represented 
  the 
  dark 
  Upper 
  Cambrian 
  

   dolomite. 
  

  

  