﻿Mississippian 
  of 
  Ohio 
  and 
  Pennsylvania. 
  

  

  307 
  

  

  equivalent 
  of 
  the 
  Berea, 
  then 
  it 
  must 
  also 
  lie 
  stratigraphically 
  

   beneath 
  the 
  Bedford. 
  Thus 
  we 
  should 
  have 
  a 
  formation 
  carry- 
  

   ing 
  fossils 
  which 
  show 
  a 
  distinct 
  affinity 
  with 
  Carboniferous 
  

   species 
  below 
  another, 
  the 
  fauna 
  of 
  which 
  is 
  distinctively 
  

   Devonian. 
  To 
  escape 
  from 
  the 
  enigma 
  three 
  possibilities 
  sug- 
  

   gest 
  themselves 
  ; 
  either 
  the 
  Bedford 
  must 
  be 
  considered 
  as 
  

   Carboniferous 
  in 
  age 
  or 
  the 
  ' 
  Corry 
  ' 
  as 
  Devonian, 
  or, 
  the 
  fauna 
  

   of 
  one 
  or 
  the 
  other 
  is 
  not 
  sufficiently 
  conclusive. 
  

  

  /6 
  

  

  3/ 
  

  

  7f 
  

  

  %(, 
  

  

  Fig. 
  4. 
  

  

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  Boi 
  

  

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  Fig. 
  4. 
  Sections 
  showing 
  the 
  Cuyahoga 
  formation. 
  

  

  Mississippian 
  formations 
  of 
  Ohio. 
  

  

  JRoyalton 
  formation 
  : 
  — 
  This 
  formation 
  was 
  named 
  by 
  Dr. 
  

   Pross'er 
  from 
  Boyalton 
  township 
  in 
  Cuyahoga 
  County, 
  Ohio.* 
  

   It 
  consists 
  largely 
  of 
  shales 
  both 
  arenaceous 
  and 
  argillaceous, 
  

   which 
  are 
  generally 
  bluish 
  or 
  bluish-gray 
  in 
  color. 
  Inter- 
  

   bedded 
  are 
  thin, 
  impure 
  sandstones 
  many 
  of 
  which 
  are 
  full 
  of 
  

   Spirophyton 
  markings. 
  It 
  includes 
  the 
  Sharpsville 
  and 
  Mead- 
  

   ville 
  formations 
  of 
  Pennsylvania 
  and 
  is 
  equivalent 
  to 
  the 
  

   upper 
  part 
  of 
  the 
  Cuyahoga 
  of 
  central 
  Ohio. 
  Also 
  it 
  is 
  quite 
  

   probable 
  that 
  it 
  iucludes 
  the 
  Shenango 
  of 
  Pennsylvania 
  and 
  

   the 
  Logan 
  of 
  central 
  Ohio. 
  However, 
  since 
  the 
  unconformity 
  

   between 
  the 
  Mississippian 
  and 
  Pennsylvanian 
  has 
  cut 
  down 
  

   lower 
  in 
  northern 
  Ohio 
  than 
  in 
  central 
  Ohio, 
  it 
  is 
  only 
  in 
  

   favored 
  .spots 
  that 
  we 
  may 
  expect 
  to 
  find 
  the 
  Poyalton 
  thick 
  

   enough 
  to 
  include 
  the 
  stratigraphic 
  horizon 
  of 
  the 
  Logan. 
  

  

  * 
  Geol. 
  Sur. 
  Ohio, 
  Bull. 
  15, 
  p. 
  493, 
  1912. 
  

  

  