Vol. VI] WEAVER— POST-EOCENE OF WESTERN WASHINGTON 21 



tain a thickness of 15,000 feet and have been folded into an- 

 ticHnes and syncHnes. Upon the basis of faimal evidence he 

 states that the fossils of the formation indicate that the basal 

 portion of the series is Oligocene in age, while the upper part 

 is certainly Miocene. Since the separation of the two members 

 will necessarily have to be made on paleontological grounds 

 and will require a more detailed study of the material in hand 

 than time has yet permitted, the term "Oligocene-Miocene 

 series" will be used temporarily to designate the age of the 

 beds. Arnold applied the term to this formation and recog- 

 nized five faunal zones within it. 



Further mention is made concerning the occurrence of Oli- 

 gocene and Miocene fossils at Restoration and Beans points, 

 just west of Seattle, by Dr. Ralph Arnold* and Dr. W H. 

 Dall.^ 



A paper published in 1908 by A. B. Reagan^ and entitled 

 "Some Notes on the Olympic Peninsula," describes the Ter- 

 tiary rocks occurring in certain localities along the north and 

 west sides of the Olympic Peninsula. Several new species of 

 mollusks are described and figured. 



In 1911, the writer, in a preliminary paper on the Ter- 

 tiary of western Washington, described in a general way the 

 distribution of the Miocene formations within the state. The 

 following subdivisions were made : Lincoln formation of Oli- 

 gocene age ; Blakeley, Wahkiakum and Chehalis formations of 

 Lower Miocene age, and the Montesano of Upper Miocene. 

 Since the appearance of that paper, more detailed field work 

 has been done by the writer. As a result, a large portion of 

 the Chehalis formation is now included within the Wahkia- 

 kum and Montesano formations, and another division inter- 

 mediate between the Lincoln and Blakeley is introduced, 

 namely, the Porter.'' The area along the western border of the 

 Olympics represented upon the map accompanying the report 

 as undifferentiated Lower Miocene, is of probable Jurassic 

 age and is now referred to as the Hoh formation. 



♦Arnold, Ralph, Professional Paper No. 47, U. S. G. S., "The Tertiary and Ouat- 

 ernary Pectens of California," Washington, 1905. 



'Dall, W. H., Professional Paper No. 59, U. S. G. S., "The Miocene of Astoria 

 and Coos P.ay, Oregon, Washington, 1906. 



"Reagan, A. B., "Some Notes on the Olympic Peninsula," Kansas Acad. Sci 

 Geological Papers, pp. 131-238, 1908. 



'Weaver, C. E., "A Preliminary Report on the Tertiary Palaeontology of Western 

 Washington, Bulletin No. 13, Washington Geological Survey, 1911. 



