80 University of Washington Publications in Geology [Vol. I 



(3) The oldest fauna recognized within the Chehalis Valley basin occurs in 

 the lowermost beds on Porter Creek and at Oakville. The fauna is subtropical in 

 character and composed of shallow water to shore genera. 



(4) The Lincoln Creek beds are correlative with the middle portion of the 

 Porter beds and contain a subtropical fauna. 



(5) The uppermost portion of the Turritella porterensis Zone is correlative 

 with the lower portion of the Acila gettysburgensis Zone of the Puget Sound Oligo- 

 cene embayment. It represents a more temperate climate than that of the middle 

 or lower Oligocene. 



(6) The Greece ranch fauna is a shallow water representative of the lower 

 portion of the Molopophorous lincolnensis Zone. 



(7) The fauna of the middle and upper portions of the Acila gettysburgensis. 

 Zone is not represented in the Chehalis Valley embayment of southwestern Wash- 

 ington. Presumably this embayment was being drained during the upper Oligocene. 



