﻿128 
  D. 
  D. 
  Gondii— 
  Beep 
  'Wells 
  at 
  Findlay, 
  Ohio. 
  

  

  Thickness 
  

   in 
  feet 
  Depth 
  

  

  White, 
  saccharoidal 
  sandstone 
  (St. 
  Peter) 
  175 
  2825-3000 
  

  

  White, 
  dolomitic 
  limestone. 
  Fragments 
  of 
  igne- 
  

   ous 
  rock 
  at 
  base 
  320 
  3000-3320 
  

  

  The 
  following 
  section 
  is 
  regarded 
  by 
  Dr. 
  Bassler 
  as 
  repre- 
  

   sentative 
  of 
  the 
  region 
  near 
  Cincinnati. 
  It 
  was 
  taken 
  from 
  a 
  

   well 
  drilled 
  at 
  Oxford, 
  described 
  by 
  Joseph 
  F. 
  James 
  in 
  volume 
  

   x 
  of 
  the 
  Journal 
  of 
  the 
  Cincinnati 
  Society 
  of 
  Natural 
  History. 
  

   The 
  correlations 
  are 
  inserted 
  in 
  brackets 
  by 
  Bassler 
  in 
  the 
  

   article 
  cited, 
  and 
  the 
  original 
  classification 
  of 
  James 
  is 
  omitted. 
  

  

  Geologic 
  section 
  of 
  well 
  at 
  Oxford, 
  Ohio* 
  

  

  Thickness 
  

   in 
  feet 
  

  

  Blue 
  limestone 
  and 
  shale 
  [Richmond 
  and 
  Maysville] 
  360 
  

  

  Blue 
  shale 
  [May 
  sville 
  and 
  Eden] 
  _._ 
  380 
  

  

  Dark 
  limestone 
  [Trenton] 
  50 
  

  

  White 
  limestone 
  with 
  magnesia 
  [Lowville 
  and 
  

  

  Stones 
  River] 
  _ 
  495 
  

  

  White, 
  arenaceous 
  limestone 
  [St. 
  Peter] 
  40 
  

  

  It 
  is 
  pointed 
  out 
  by 
  Dr. 
  Bassler 
  that 
  the 
  Maysville 
  and 
  

   Richmond 
  do 
  not 
  vary 
  greatly 
  in 
  thickness 
  across 
  the 
  Cincin- 
  

   nati 
  arch, 
  but 
  that 
  the 
  great 
  variation 
  in 
  thickness 
  of 
  the 
  Cin- 
  

   cinnatian 
  series 
  is 
  probably 
  due 
  to 
  an 
  increasing 
  thickness 
  of 
  

   Utica 
  shale 
  away 
  from 
  the 
  apex 
  of 
  the 
  axis. 
  He 
  also 
  says 
  :f 
  

  

  " 
  The 
  same 
  eastward 
  increase 
  in 
  thickness 
  for 
  the 
  Trenton 
  

   rocks 
  may 
  be 
  stated 
  with 
  less 
  doubt. 
  At 
  Cincinnati 
  the 
  lower 
  50 
  

   feet 
  of 
  the 
  Trenton 
  are 
  exposed 
  with 
  the 
  thin 
  Utica 
  shale 
  resting 
  

   upon 
  its 
  eroded 
  surface. 
  Proceeding 
  southeast 
  along 
  the 
  Ohio 
  

   River, 
  this 
  thickness 
  increases 
  to 
  over 
  100 
  feet, 
  in 
  a 
  distance 
  of 
  

   30 
  miles, 
  by 
  the 
  addition 
  of 
  higher 
  beds 
  of 
  the 
  formation. 
  The 
  

   occurrence 
  of 
  125 
  feet 
  of 
  Trenton 
  strata 
  at 
  Waverly 
  80 
  miles 
  

   east, 
  is, 
  therefore, 
  in 
  line 
  with 
  the 
  idea 
  that 
  the 
  Trenton 
  and 
  the 
  

   Utica 
  are 
  alike 
  in 
  having 
  a 
  minimum 
  thickness 
  along 
  the 
  Cincin- 
  

   nati 
  axis." 
  

  

  The 
  thickness 
  of 
  the 
  lower 
  formations 
  of 
  the 
  Cincinnatian 
  

   series 
  at 
  Findlay 
  and 
  other 
  localities 
  in 
  northwestern 
  Ohio, 
  is 
  

   shown 
  by 
  well 
  records 
  to 
  range 
  from 
  700 
  to 
  1000 
  feet, 
  being 
  

   732 
  feet 
  at 
  Findlay, 
  and 
  over 
  950 
  feet 
  at 
  Carey 
  in 
  Wyandot 
  

   County. 
  Records 
  in 
  Van 
  Wert, 
  Allen, 
  Hancock, 
  Wyandot, 
  

   and 
  Wood 
  counties, 
  all 
  show 
  a 
  bluish 
  gray 
  shale 
  in 
  the 
  upper 
  

   portion 
  and 
  beneath 
  this 
  a 
  calcareous, 
  brown, 
  fossiliferous 
  shale 
  

   which 
  everywhere 
  varies 
  only 
  a 
  little 
  from 
  300 
  feet 
  in 
  thick- 
  

   ness. 
  It 
  seems 
  probable 
  that 
  this 
  brown 
  shale 
  is 
  the 
  equiva- 
  

   lent 
  of 
  the 
  Utica 
  and 
  at 
  least 
  a 
  portion 
  of 
  the 
  Eden 
  shale 
  of 
  

   the 
  Cincinnati 
  region. 
  

  

  * 
  This 
  Jour., 
  4th 
  ser., 
  vol. 
  xxxi, 
  p. 
  22. 
  f 
  Op. 
  cit., 
  p. 
  23. 
  

  

  