GEOGRAPHIC DISTRIBUTION 



37 



carina, etc., were very widely distributed in the Tertiary, but 

 have now become extinct except in these restricted areas. 



These migrations of the Tertiary account in a large measure 

 for some of the peculiar distributions that are found today. The 

 living fauna of the Caribbean and West Indian region is much 

 more like that of the Australian region than any other. The 

 cold water fauna of the west coast of South America is more 

 like that of northern Europe than it is like that of the 

 islands of the Oceanic groups a comparatively short distance 

 away. 



Distribution of Cold Water Faunas. 



In general the bottom living recent foraminifera may be 

 divided into cold water and warm water faunas. These are 

 shown crudely on the two accompanying maps. The cold water 

 faunas are also found to some extent in the deeper colder waters 

 of the oceans. The Arctic fauna covers the cold waters of the 

 Arctic region and comes southward along both sides of the 

 Atlantic, much farther to the south on the western side. Like- 

 wise, it works southward into the Pacific especially on the 



