950 



HISTORICAL GEOLOGY., 



Evidence from Mammalian migration between North America and Europe 

 or Asia. — Another argument for the elevation of the land of the higher 

 latitudes, and particularly tlie polar, has been drawn from the fact that the 

 migration of Plants and Mammals took place between the two continents in 



1549. 



Bath3'metric map of the Arctic seas, reduced from the chart of the U. S. Topographic Department. 



the Quaternary. The migrating species include the Reindeer, Moose, Elk, 

 Polar Bear, G-rizzly Bear (the Brown Bear, Ursus Arctos of Europe, being 

 regarded as identical with the Grizzly), Beaver, and probably other Mammals. 

 There were also even migrating Unios, one species, Margaritana margaritifera, 



