PALEOGEOGRAPHIC MAPS OF NORTH AMERICA 505 
The region of the West Indies was the seat of an embayment of 
the Atlantic, beneath which was deposited the widespread Oligocene 
limestone, characterized by the fauna of a warm oceanic current. 
This fauna spread north along the southeastern coast of the 
United States. 
I am indebted to Dr. Wm. H. Dall and Dr. Ralph Arnold for dis- 
cussion of the distribution of marine faunas and their relation to 
inferred currents. 
