

CONTENTS. i 



Part III. Tiik Chf.tai kois fi.oua -('(Hiliriui'il. Pig"- 



Flora of thr OldiT I'nloiiiac I'ormatioii - ('oMtiiiucd. 



Recent collcclioiis of fossil plants from the Ol.lcr I'otoniai- of Virginia and Maryland— (onl'd. 

 Roporl on varions collerlions of fossil |)lanls from tlu- Older Potomac, etc.— Continued. 

 Ijocalilics ill the District .)t (;olmid>ia- Continued. 



Fossil plants from the new reservoir -^l" 



Fossil plants from Terra Cotta -^l" 



Fossil plants from Ivy City '^'^ 



Fo.ssil plants from Langdoii ■'''^ 



General remarks '^"'^ 



Fossil plants froTu the Queens Chapel road •''-' 



Localities in Maryland 



Fossil plants from Hosiers Bliilf 



Fo.ssil plants from Kiverdale 



Fossil plants from near Bern'yn « ^^^ 



Fossil plants from the Bewley estate ^^ 



Fossil plants from Mnirkirk 0^4 



Fossil plants from Contee '•'' 



Fossil plants from Arlington ■"'■" 



Age of the Arlington heds -^-^^ 



Fossil plants from Hanover °^'^ 



Fossil plants from the Howard Brown estate 544 



Fossil plants from Reynolds's ore pit •''44 



Fossil plants from German's iron mine •'45 



Fossil plants from Hobbs's iron mine '^'^ 



Fossil plants from Tiptop •''"'■5 



Fossil plants from Vinegar Hill •''4' 



Fossil plants from Soper Hall •~'^^ 



Fossil plants from Lansdowne •'■'''' 



Fossil plants from Federal Hill ^^^ 



Age of the Federal Hillbeds •'i<56 



Fossil plants from Union tunnel •'^''0 



Fossil plants from Springfield •''"^ 



Fossil plants from Stemmers Run . •"'"! 



Fossil plants from Broad Creek ■'''2 



Fossil plants from Plum Creek -WS 



Fossil plants from Muddy Creek ■" 2 



Fossil plants from Locust or Poplar Point -"S 



Fossil plants from Grays Hill •'•"•^ 



General remarks and conclusions -"4 



Correlation of the Potomac formation in Virginia and Maryland -^^O 



Table of distribution of Potomac plants 582-589 



Analysis of the table ^^ 



Columnar .section of the Potomac formation •"'■'' •'■''^ 



Index ^^ 



