﻿190 
  F. 
  H. 
  Knowlton 
  — 
  A 
  Dicotyledonous 
  Flora 
  

  

  which, 
  as 
  already 
  stated, 
  is 
  about 
  15 
  feet 
  below 
  the 
  

   upper 
  limit 
  of 
  the 
  formation. 
  A 
  fuller 
  discussion 
  of 
  this 
  

   type 
  section 
  of 
  the 
  Morrison, 
  and 
  a 
  recommendation 
  for 
  

   redefinition, 
  will 
  be 
  found 
  in 
  the 
  paper 
  by 
  Mr. 
  Lee 
  which 
  

   accompanies 
  this 
  paper. 
  

  

  The 
  material 
  studied 
  consists 
  of 
  about 
  20 
  pieces 
  of 
  

   matrix 
  and 
  has 
  afforded 
  the 
  following 
  forms 
  : 
  

  

  Salix 
  sp., 
  cf. 
  Salix 
  protecefolia 
  Lesquereux. 
  

  

  ? 
  Ficus 
  daphnogenoides 
  (Heer) 
  Berry. 
  

  

  Ficus 
  magnolia 
  folia 
  Lesquereux. 
  

  

  Cf. 
  Eucalyptus 
  dakotensis 
  Lesquereux. 
  

  

  Phyllites 
  sp. 
  

  

  Phyllites 
  sp. 
  

  

  This 
  small 
  flora 
  is 
  thus 
  seen 
  to 
  comprise 
  six 
  distinct 
  

   forms, 
  of 
  which 
  one 
  species 
  is 
  positively, 
  and 
  three 
  are 
  

   provisionally 
  identified. 
  

  

  Ficus 
  magnolicefolia, 
  the 
  form 
  positively 
  determined, 
  

   was 
  first 
  described 
  from 
  the 
  supposed 
  Dakota 
  at 
  Morri- 
  

   son, 
  Colorado, 
  and 
  was 
  later 
  reported 
  by 
  Lesquereux 
  as 
  

   present 
  in 
  the 
  Dakota 
  sandstone 
  of 
  Kansas. 
  

  

  Ficus 
  daphnogenoides 
  was 
  established 
  on 
  material 
  from 
  

   the 
  Dakota 
  sandstone 
  of 
  Nebraska, 
  and 
  has 
  since 
  been 
  

   found 
  in 
  the 
  Woodbine 
  formation 
  at 
  Arthur's 
  Bluff, 
  

   Texas, 
  the 
  Cheyenne 
  formation 
  at 
  Chatman 
  Creek, 
  

   Kansas, 
  the 
  Magothy 
  formation 
  of 
  New 
  Jersey, 
  Dela- 
  

   ware, 
  Maryland, 
  and 
  elsewhere, 
  the 
  Raritan 
  formation 
  

   of 
  New 
  Jersey, 
  the 
  Bladen 
  formation 
  of 
  North 
  Carolina, 
  

   and 
  the 
  Tuscaloosa 
  formation 
  of 
  Alabama. 
  

  

  Eucalyptus 
  dakotensis 
  has 
  the 
  Dakota 
  sandstone 
  of 
  

   Kansas 
  as 
  the 
  type 
  and 
  only 
  previously 
  known 
  locality. 
  

   It 
  may 
  be 
  only 
  a 
  very 
  narrow 
  leaf 
  of 
  Salix 
  protecefolia. 
  

  

  The 
  leaves 
  described 
  by 
  Lesquereux 
  under 
  the 
  name 
  

   of 
  Salix 
  protecefolia 
  came 
  originally 
  from 
  the 
  Dakota 
  

   sandstone 
  of 
  Nebraska, 
  and 
  were 
  subsequently 
  found 
  at 
  

   many 
  localities 
  in 
  the 
  Dakota 
  of 
  Kansas, 
  and 
  are 
  present 
  

   in 
  the 
  supposed 
  " 
  Dakota' 
  ' 
  of 
  Colorado. 
  

  

  The 
  above 
  comparisons 
  show 
  very 
  clearly 
  that 
  the 
  

   affinity 
  of 
  this 
  Morrison 
  flora 
  is 
  undoubtedly 
  with 
  the 
  

   flora 
  of 
  Dakota 
  sandstone, 
  or 
  perhaps 
  it 
  would 
  be 
  better 
  

   to 
  say, 
  with 
  the 
  plant-bearing 
  beds 
  possibly 
  in 
  the 
  upper 
  

   part 
  of 
  the 
  Lower 
  Cretaceous, 
  or 
  the 
  lower 
  part 
  of 
  the 
  

   Upper 
  Cretaceous 
  which 
  the 
  term 
  Dakota 
  is 
  now 
  made 
  

   to 
  cover. 
  It 
  is 
  perhaps 
  safe 
  to 
  say 
  that 
  without 
  the 
  

   knowledge 
  that 
  this 
  flora 
  came 
  from 
  beds 
  hitherto 
  re- 
  

  

  