GEOGRAPHICAL DEVELOPMENT OF THE AMERICAS
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![](http://upload.wikimedia.org/wikipedia/commons/thumb/2/2b/A_History_of_Land_Mammals_in_the_Western_Hemisphere_Fig._48.jpg/450px-A_History_of_Land_Mammals_in_the_Western_Hemisphere_Fig._48.jpg)
Fig. 48.—Map of North America during the Eocene epoch. The present limits of the continent are shown in outline; white areas = land; horizontal lines = sea; dotted areas = non-marine deposits; black circles with white dots = active volcanoes.
(After Schuchert)