﻿194 
  F. 
  H. 
  Knowlton 
  — 
  A 
  Dicotyledonous 
  Flora. 
  

  

  and 
  makes 
  it 
  all 
  basal 
  Upper 
  Cretaceous. 
  Further, 
  

   Lee's 
  interpretation 
  of 
  the 
  physiographic 
  history 
  of 
  

   the 
  region, 
  indicating 
  a 
  relatively 
  short 
  time 
  interval 
  

   between 
  the 
  type 
  Morrison 
  and 
  the 
  sandstone 
  formerly 
  

   called 
  lower 
  Dakota, 
  and 
  making 
  the 
  main 
  stratigraphic 
  

   break 
  at 
  the 
  base 
  of 
  the 
  Saurian 
  conglomerate 
  the 
  line 
  

   of 
  separation 
  between 
  Lower 
  Cretaceous 
  and 
  Upper 
  Cre- 
  

   taceous, 
  undoubtedly 
  finds 
  support 
  in 
  this 
  flora. 
  

  

  