Introduction. xxiii 



SOtJTH AMEIIICA. 



Kurtz (1902) directed attention to the existence of a Flora of 

 tlie age of the " Dakota Group '' in Argentina. The Neocomian 

 flora has also received attention from Neumann (1907). 



ARCTIC EEGIOjSTS. 



The Cretaceous Ploras of the Arctic are so well known 

 through Heer's classical wort (see ' Mora Fossilis Arctica,' 

 various parts in bibliogfaphj') that it will be necessary merely 

 to mention his papers. The Kome, Atane, and Patoob Beds of 

 Greenland are the best known, and are most important from a 

 geological point of view on account of the proof they afford of 

 the great changes of climate which must have occurred in that 

 region. They have j'ielded a large number of plant-impressions, 

 principally Gymnosperms and Angiosperms, with a few 

 characteristic Ferns, Unfortunately, however, petrified Speci" 

 mens are not available, although som-ething call be done with 

 many of the cuticles, and the material on the whole is well 

 preserved. Nathorst has continned and amplified Heer's work, 

 his large collections of impressions testifying to the richness of 

 the deposits ; and his description of a Cenomanian plant from 

 Greenland (1907) forms a valuable contribution to the literature 

 of the Cycadophyta. 



