﻿H. 
  S. 
  Williams 
  — 
  Southern 
  Devonian 
  formations. 
  395 
  

  

  Chart 
  showing 
  the 
  approximate 
  position 
  of 
  the 
  Devonian 
  intercontinental 
  sea. 
  

   The 
  strong 
  lines 
  with 
  fringes 
  represent 
  the 
  edges 
  of 
  undoubted 
  land 
  masses 
  of 
  

   Silurian 
  time 
  ; 
  the 
  dotted 
  lines 
  probable 
  extension 
  of 
  these 
  shores 
  during 
  Devon- 
  

   ian 
  time 
  ; 
  heavy 
  line 
  about 
  C 
  = 
  oscillating 
  shore 
  lines 
  of 
  which 
  the 
  exact 
  mar- 
  

   gin 
  is 
  unknown; 
  L, 
  Laurentia 
  land; 
  A, 
  Appalachia 
  land; 
  R, 
  Rocky 
  Mountain 
  

   lands 
  or 
  islands; 
  W, 
  Wisconsin 
  peninsula; 
  C, 
  Cincinnati 
  plateau; 
  M, 
  Missouri 
  

   island; 
  K, 
  probable 
  edge 
  of 
  a 
  land-mass 
  over 
  Arkansas 
  and 
  Indian 
  territory; 
  T, 
  

   a 
  piece 
  of 
  shore-line 
  in 
  Texas, 
  the 
  extension 
  of 
  which 
  is 
  unknown. 
  

  

  