Cenozoic Floras Around the Northern Pacific 8i 



Profound changes in physical conditions around the northern 

 basin of the Pacific in late geologic time, as shown by the lithol- 

 ogy, structure, and areal extent of Cenozoic rocks, have altered 

 the vegetation of this region, especially with respect to its distri- 

 bution. It seems clear that a consideration of the paleontologic 

 record, as well as of the living plants, forms the basis for any 

 complete understanding of modern vegetation. 



