OF UPPER EOCENE CLIMATES. 



11 



in Baffin Bay, and 15 degrees farther North in western Spitzbergen, 

 and there is a corresponding northward swing over the ocean between 

 Spitzbergen and Nova Zembla. 



When the times of widest extension of equable and mild climates 

 in the past are considered — the most conspicuous of which, in post- 



FiG. I. Sketch map of the middle Eocene showing location of the " Arctic 



floras " of the upper Eocene. 



Paleozoic times, are those of the Jurassic, Cretaceous, and later 

 Eocene — they all appear to bear a definite relationship to periods of 

 sea extension and reduction of land areas. To give objectivity to 

 this statement I have prepared a map, on a North Polar projection, 



