﻿D. 
  D. 
  Condit 
  — 
  Deep 
  Wells 
  at 
  Findlay, 
  Ohio. 
  125 
  

  

  Geologic 
  section 
  of 
  wells 
  at 
  Findlay, 
  Ohio. 
  

  

  Depth 
  Thick- 
  

  

  in 
  feet 
  ness 
  

  

  Glacial 
  drift 
  0-87 
  87 
  

  

  Silurian 
  : 
  

  

  Niagaran 
  strata 
  : 
  

  

  (c) 
  Limestone, 
  dark 
  gray, 
  slightly 
  dolo- 
  

  

  mitic, 
  dense 
  textured 
  87-134 
  47 
  

  

  (b) 
  Limestone, 
  gray, 
  crystalline, 
  slightly 
  

  

  dolomitic 
  134-195 
  61 
  

  

  («) 
  Limestone, 
  dark, 
  minutely 
  crystalline 
  195-245 
  50 
  

  

  Strata 
  of 
  Medina 
  or 
  Clinton 
  age 
  : 
  

  

  (b) 
  Shale, 
  calcareous 
  _ 
  245-255 
  10 
  

  

  (a) 
  Limestone, 
  pinkish, 
  brownish, 
  and 
  

   gray 
  ; 
  minutely 
  granular 
  texture 
  

  

  (probably 
  Ohio 
  " 
  Clinton 
  ") 
  _ 
  255-343 
  88 
  

  

  Ordovician 
  : 
  

  

  Cincinnatian 
  series 
  : 
  

  

  Strata 
  probably 
  equivalent 
  to 
  Richmond 
  

   and 
  lower 
  Medina 
  : 
  

  

  (b) 
  Shale, 
  grayish 
  343-399 
  56 
  

  

  (a) 
  Shale, 
  red.-. 
  399-433 
  34 
  

  

  Strata 
  of 
  Maysville, 
  Eden, 
  and 
  Utica 
  age 
  : 
  

  

  (b) 
  Shale, 
  a 
  gray 
  to 
  dark 
  gray, 
  unusually 
  

   pure 
  clay 
  shale. 
  Some 
  parts 
  resem- 
  

   ble 
  flint 
  clay. 
  Grit 
  is 
  almost 
  want- 
  

   ing. 
  Scattered 
  particles 
  of 
  marcasite 
  

   present. 
  A 
  slight 
  flow 
  of 
  gas 
  report- 
  

   ed 
  at 
  770 
  feet 
  in 
  Norris 
  well. 
  No 
  

   fossils 
  were 
  seen, 
  (Maysville 
  and 
  

  

  upper 
  Eden.) 
  433-965 
  532 
  

  

  (a) 
  Shale, 
  dark 
  brown, 
  calcareous, 
  very 
  

   fossiliferous. 
  A 
  species 
  of 
  Dalma- 
  

   nella 
  was 
  the 
  only 
  form 
  recognized. 
  

   The 
  age 
  of 
  the 
  beds 
  is 
  probably 
  Utica 
  

  

  and 
  in 
  part 
  Eden 
  965-1165 
  200 
  

  

  Mohawkian 
  series 
  : 
  

  

  (c) 
  Limestone 
  (Trenton? 
  or 
  Galena?), 
  

  

  highly 
  dolomitic, 
  brownish 
  gray, 
  

   granular 
  texture, 
  having 
  numerous 
  

   cavities 
  lined 
  with 
  crystals 
  of 
  dolo- 
  

   mite 
  and 
  marcasite. 
  In 
  the 
  Grubb 
  

   well 
  there 
  was 
  a 
  show 
  of 
  oil 
  23 
  and 
  

   46 
  feet 
  below 
  top 
  and 
  salt 
  water 
  at 
  

   40 
  feet 
  which 
  rose 
  200 
  feet. 
  This 
  is 
  

   the 
  " 
  Trenton 
  oil 
  rock" 
  of 
  northwest- 
  

   ern 
  Ohio 
  1165-1233 
  68 
  

  

  (b) 
  Limestone, 
  slightly 
  dolomitic, 
  vary- 
  • 
  

  

  ing 
  from 
  dark 
  gray 
  to 
  nearly 
  black, 
  

   dense 
  textured. 
  Some 
  shaly 
  beds. 
  

   Fossils 
  are 
  plentiful, 
  and 
  indicate 
  

   Black 
  River 
  age 
  _ 
  1233-1325 
  92 
  

  

  