OF THE WEST COAST 



30.^ 



liiicoliieiisis zone is due, in 1arue part, to differences in the temperature 

 of the waters in which the faunas lived. The former fauna undoubtedly 

 existed under more temperate conditions than did the latter. This is 

 sliown by the fact that a num!)er of the species in the Agasoma acumi- 

 natum beds show very close affinities with certain species which are now 

 jiving oif the coast of Vancouver Island, Washington, and Oregon. The 

 fauna of the ^Molopophorus lincolnensis zone is more tropical in character, 

 containing a fairly large number of species which are closely related to 



Figure 3. — Outline of Oligocene Sea in Washington 



Tejon (Upper Eocene) species, and if we should look for their recent 

 affinities we would expect to find them in the tropical and subtropical 

 waters off the coasts of Lower California, Central and South America. 



The latest of the Oligocene faunas in Oregon, Washington, and Van- 

 couver Island is that from the Acila gettysburgensis zone. The beds in 

 which the Acila gettysburgeiisis fauna is found are several thousand feet 

 in thickness. On Vancouver Island and in tlie vicinity of Eestoration 

 Point, near Port Blakeley, heavy conglomerates are found which sepa- 



