Gress: Fossil Plants of the Dakota. 281 



Newberry, in the " Flora of the Amboy Clays," U. S. Geological Sur- 

 vey, Monograph XXVI, 1895, p. 33, says: " We may fairly infer that 

 the collection of plants from the New Jersey clays, the Dakota Group, 

 the Patoot and Atane beds of Greenland, the Aachen series of Ger- 

 many, and the plant-bearing Cretaceous rocks of Bohemia fairly 

 represent the vegetation of the world during the middle and later 

 portions of the Cretaceous age." 



The location of the Dakota Formation in the Cretaceous series and 

 its correlation with other formations can probably be best shown by 

 the following tables and outlines. 



The Cretaceous of Continental Europe is shown in the following 

 outline (see " Traite de Geologie " by Lapparent, Vol. Ill, 1906) : 



Upper Cretaceous, 

 Danian. 

 Senonian. 

 Turonian. 

 Cenomanian. 



Lower Cretaceous. 

 Albian. 

 Aptian. 

 Barremian. 

 Neocomian. 



Table No. i (see p. 283) is compiled from the various tables given 

 by C. A. White, U. S. Geological Survey, Bulletin 82, 1891. At the 

 top of each column is given the number corresponding to the section 

 given in the following explanation : 



I. Meek and Hayden's Upper Missouri River Section. 

 II. General Section of the Upper Cretaceous for the Great Inte- 

 rior Area by Elridge. 



III. The New Jersey Section, Cook and Rodgers. 



IV. Smith and Johnson's Alabama Section, 

 V, Hilgard's Mississippi Section. 



VI. The East Texas Section. 

 VII. The West Texas Section. 

 VIII. The North Mexican Section. 



