122 The Lower Cretaceous Floras of the World 



Cycadella compressa Ward 

 ■ Cycadella concinna Ward 

 Cycadella contracta Ward 

 Cycadella crepidaria Ward 

 Cycadella exogena Ward 

 Cycadella ■ferruginea Ward 

 Cycadella jejuna Ward 

 Cycadella jurassica Ward 

 Cycadella gelida Ward 

 Cycadella gravis Ward 

 Cycadella Knightii Ward 

 Cycadella Knowltoniana Ward 

 Cycadella nodosa Ward 



Cycadella ramentosa Ward - 



Cycadella Reedi Ward 

 Cycadella verrucosa Ward 

 Cycadella Wyoming ensis Ward 



In this connection a single species from this same horizon in Wyoming 

 (Beulah clays) should be mentioned. It is 



Cycadella utopiensis (Ward) Wieland 



Pacific Coast 



On the Pacific coast of North America the Shasta Group has been 

 divided primarily into Knoxville and Horsetown beds. These have been 

 at times called formations, at other times, as in Monograph xlviii of the 

 U. S. Geological Survey, the Shasta is called a formation. Again the 

 series is united vrith the Upper Cretaceous as the Shasta-Chico series, 

 while local formational names have also been used in parts of the area. 

 The history of the study of the floras was fully detailed by Professor 

 Ward in 1906 (lac. cit.). Still more recently Kuowlton^ has con- 

 clusively shown that the Knoxville beds are largely of Upper Jurassic 

 age, the so-called Shasta flora being confined to the extreme upper part 

 of the great thickness of apparently conformable beds which have been 

 referred to the Knoxville. The writer is not concerned with the question 

 of nomenclature in the present connection, and has used the term Shasta 

 throughout the systematic jjart of the work to designate that part of the 

 Knoxville, which is of Lower Cretaceous age, as shown by the contained 



^ Knowlton, Amer. Journ. Sci. (iv), vol. xxx, 1910, pp. 33-64. 



