﻿W. 
  A. 
  Verwiebe 
  — 
  Correlation 
  of 
  the 
  Mississippian 
  ^ 
  etc. 
  301 
  

  

  Art. 
  XXYII. 
  — 
  Correlation 
  of 
  the 
  Mississippian 
  of 
  Ohio 
  and 
  

   Pennsylvania 
  ; 
  by 
  Walter 
  A. 
  Yerwiebe, 
  Ohio 
  State 
  Uni- 
  

   versity, 
  Columbus, 
  Ohio. 
  

  

  Ever 
  since 
  the 
  time 
  when 
  it 
  became 
  possible 
  to 
  discuss 
  geo- 
  

   logic 
  systems 
  in 
  this 
  country 
  in 
  formational 
  detail, 
  the 
  problem 
  

   of 
  the 
  correlation 
  of 
  Devonian 
  and 
  Carboniferous 
  formations 
  

   in 
  northeastern 
  Ohio 
  and 
  northwestern 
  Pennsylvania 
  loomed 
  

   large 
  in 
  geologic 
  literature. 
  It 
  was 
  not 
  a 
  simple 
  matter 
  to 
  

   trace 
  the 
  Devonian 
  formations 
  of 
  New 
  York 
  into 
  northwestern 
  

   Pennsylvania, 
  nor 
  was 
  it 
  an 
  easy 
  task 
  to 
  define 
  the 
  continua- 
  

   tion 
  of 
  the 
  lower 
  Carboniferous 
  formations 
  of 
  eastern 
  Penn- 
  

   sylvania, 
  in 
  western 
  Pennsylvania. 
  Both 
  of 
  these 
  problems, 
  

   however, 
  have 
  been 
  solved 
  to 
  a 
  satisfactory 
  degree. 
  

  

  In 
  the 
  west 
  the 
  excellent 
  work 
  of 
  Orton, 
  Newberry, 
  and 
  

   Prosser 
  soon 
  brought 
  order 
  out 
  of 
  the 
  profusion 
  of 
  shales 
  and 
  

   sandstones 
  which 
  compose 
  the 
  Devonian 
  and 
  lower 
  Carbonifer- 
  

   ous 
  of 
  Ohio. 
  By 
  some 
  strange 
  coincidence, 
  however, 
  the 
  line 
  

   dividing 
  this 
  state 
  from 
  Pennsylvania 
  seemed 
  also 
  to 
  form 
  an 
  

   insuperable 
  barrier 
  between 
  the 
  formations 
  in 
  both. 
  Many 
  of 
  

   our 
  most 
  capable 
  stratigraphers 
  have 
  attempted 
  to 
  correlate 
  

   the 
  Devonian 
  in 
  these 
  two 
  areas, 
  but 
  it 
  must 
  be 
  confessed, 
  

   with 
  unsatisfactory 
  results. 
  

  

  The 
  writer 
  does 
  not 
  presume 
  to 
  think 
  that 
  he 
  has 
  found 
  the 
  

   key 
  to 
  this 
  riddle, 
  but 
  after 
  spending 
  two 
  seasons 
  in 
  the 
  field 
  

   he 
  has 
  reason 
  to 
  hope 
  that 
  some 
  of 
  his 
  findings 
  may 
  contribute 
  

   a 
  little 
  in 
  that 
  direction. 
  The 
  area 
  covered 
  in 
  this 
  survey 
  

   extends 
  approximately 
  from 
  the 
  Cuyahoga 
  Biver 
  in 
  Ohio 
  to 
  

   the 
  Allegheny 
  Piver 
  in 
  Pennsylvania 
  and 
  from 
  Lake 
  Erie 
  

   south 
  to 
  the 
  parallel 
  of 
  41° 
  north 
  latitude. 
  It 
  thus 
  includes 
  

   roughly 
  the 
  northeastern 
  part 
  of 
  Ohio 
  and 
  the 
  northwestern 
  

   part 
  of 
  Pennsylvania. 
  In 
  a 
  former 
  article 
  published 
  in 
  this 
  

   magazine* 
  the 
  correlation 
  of 
  the 
  Berea 
  formation 
  was 
  treated 
  

   in 
  some 
  detail 
  as 
  the 
  basal 
  member 
  of 
  the 
  Mississippian. 
  In 
  

   this 
  article 
  the 
  remaining 
  formations 
  will 
  be 
  taken 
  up. 
  

  

  Formations 
  involved 
  in 
  this 
  discussion. 
  

  

  Sharon 
  conglomerate 
  : 
  This 
  is 
  the 
  basal 
  formation 
  of 
  the 
  

   Pottsville 
  series 
  of 
  the 
  Pennsylvanian 
  system. 
  It 
  was 
  used 
  

   merely 
  as 
  a 
  key 
  horizon 
  and 
  was 
  not 
  studied 
  to 
  any 
  further 
  

   extent 
  in 
  connection 
  with 
  this 
  work. 
  

  

  Mississippian 
  formations 
  of 
  Pennsylvania. 
  

  

  Shenango 
  Shale: 
  This 
  formation 
  was 
  named 
  by 
  I. 
  C. 
  White. 
  

   It 
  is 
  recognizable 
  as 
  a 
  stratigraphic 
  unit 
  only 
  over 
  a 
  limited 
  

   extent 
  of 
  territory 
  since 
  it 
  merges 
  imperceptibly 
  with 
  the 
  

  

  * 
  This 
  Journal, 
  vol. 
  xlii, 
  pp. 
  43 
  to 
  58, 
  July, 
  1916. 
  

  

  