﻿Q 
  

  

  IS 
  W. 
  A. 
  Tericiebe 
  — 
  Correlation 
  of 
  the 
  ^Mississippi 
  an* 
  etc. 
  

  

  of 
  Titusville 
  and 
  leading 
  into 
  Hammond 
  Run 
  below. 
  It 
  also 
  

   shows 
  the 
  character 
  of 
  the 
  upper 
  Meadville 
  in 
  excellent 
  

   fashion. 
  But 
  for 
  the 
  presence 
  of 
  the 
  upper 
  limestone 
  it 
  might 
  

   well 
  be 
  mistaken 
  for 
  the 
  Shenango 
  sandstone. 
  

  

  29a. 
  Markley 
  Quarry 
  Section. 
  

  

  Thickness 
  

   No. 
  Feet. 
  

  

  10. 
  Shenango 
  Shale. 
  Shale, 
  bluish 
  grey, 
  somewhat 
  argilla- 
  

   ceous 
  _ 
  2 
  

  

  9. 
  Sandstone, 
  brownish 
  l£ 
  

  

  5. 
  Shale, 
  sandy 
  . 
  _ 
  1 
  + 
  

  

  7. 
  Sandstone, 
  coarse, 
  ferruginous, 
  whitish 
  grey 
  § 
  

  

  6. 
  Shale, 
  blue, 
  clayey 
  _. 
  __ 
  _ 
  of 
  

  

  5. 
  Shenango 
  Sandstone. 
  Sandstone, 
  somewhat 
  flaggy, 
  

  

  more 
  massive 
  toward 
  the 
  top, 
  whitish 
  grey, 
  mica- 
  

   ceous 
  26 
  

  

  4. 
  Same, 
  single 
  layer 
  9^ 
  

  

  3. 
  Covered 
  146 
  

  

  2. 
  Corry. 
  Sandstone, 
  white 
  quartz 
  rock 
  weathering 
  to 
  

  

  buff, 
  massive, 
  layers 
  irregular 
  4 
  

  

  1. 
  Miceville. 
  Shale, 
  bluish 
  grey, 
  partly 
  argillaceous 
  with 
  

  

  interbedded 
  sandstones 
  to 
  R. 
  R. 
  level 
  38 
  

  

  Just 
  south 
  of 
  Titnsville, 
  Pa., 
  is 
  the 
  abandoned 
  quarry 
  of 
  

   O. 
  W. 
  Markley. 
  It 
  was 
  worked 
  for 
  the 
  sandstone 
  of 
  the 
  

   Shenango 
  formation. 
  The 
  section 
  then 
  continues 
  down 
  to 
  the 
  

   Pennsylvania 
  railroad 
  tracks 
  nearby. 
  The 
  importance 
  of 
  

   this 
  section 
  is 
  that 
  it 
  shows 
  in 
  great 
  detail 
  the 
  character 
  of 
  the 
  

   Shenango 
  shale 
  and 
  underhung 
  sandstone. 
  A 
  studv 
  of 
  it 
  will 
  

   show 
  that 
  the 
  term 
  Shenango 
  Shale 
  is 
  a 
  misnomer, 
  since 
  it 
  

   consists 
  largely 
  of 
  sandstone 
  and 
  that 
  the 
  term 
  Shenango 
  

   should 
  cover 
  both 
  phases 
  in 
  other 
  parts 
  of 
  the 
  district 
  as 
  well 
  

   as 
  this. 
  

  

  List 
  of 
  Sections 
  used 
  in 
  Figures 
  1-5. 
  

  

  The 
  following 
  sections 
  are 
  taken 
  from 
  Bull. 
  15 
  of 
  the 
  Geol. 
  

   Survey 
  of 
  Ohio 
  : 
  No. 
  16, 
  page 
  72; 
  No. 
  31, 
  p. 
  143; 
  38, 
  p. 
  158; 
  

   47, 
  p."l94; 
  74, 
  p. 
  316; 
  79, 
  p. 
  336; 
  82, 
  p. 
  353; 
  86, 
  p. 
  363; 
  89, 
  p. 
  

   380; 
  90, 
  p. 
  382; 
  92, 
  p. 
  399; 
  107, 
  p. 
  489. 
  

  

  The 
  following 
  were 
  published 
  in 
  vol. 
  xliii 
  of 
  this 
  Journal, 
  July, 
  

   1916: 
  No. 
  13a 
  on 
  page 
  56; 
  21a, 
  p. 
  56; 
  22a, 
  p. 
  57. 
  

  

  The 
  following 
  may 
  be 
  found 
  in 
  vol. 
  Q4, 
  Second 
  Pa. 
  Geol. 
  Sur- 
  

   vey, 
  1881: 
  6ic, 
  p. 
  194; 
  Sic, 
  p. 
  182; 
  llic, 
  p. 
  139; 
  12w, 
  p. 
  173. 
  

  

  No. 
  2B 
  was 
  taken 
  from 
  the 
  general 
  section 
  published 
  on 
  page 
  

   193 
  of 
  the 
  Report 
  of 
  the 
  Top. 
  and 
  Geol. 
  Surv. 
  Comm. 
  of 
  Pa. 
  for 
  

   1906-1908. 
  

  

  The 
  following 
  will 
  be 
  found 
  published 
  in 
  this 
  article: 
  la, 
  

   p. 
  312; 
  3a, 
  p. 
  313; 
  6a, 
  p. 
  314; 
  18a, 
  p. 
  314; 
  24a, 
  p. 
  316; 
  25a, 
  

   p. 
  316; 
  29a, 
  above. 
  

  

  