Vol. VI] WEAVER— POST-EOCENE OF WESTERN WASHINGTON 31 



in the lower portion of this section is ahnost identical with 

 that at the well-known locality just north of Restoration Point. 

 In other words, there appears to be but one faunal zone rep- 

 resented wnthin the strata exposed between Orchard Point at 

 the base of the section and the north shore of Blakeley Har- 

 bor at the top of the section. 



The most characteristic species of the Acila gettysburgensis 

 zone are Acila gettysburgensis Reagan, Macrocallista vesper- 

 tina (Conrad), Marcia oregoncnsis (Conrad), Modiolus rec- 

 tus Dall, Panope generosa (Gould), Phacoides acutilineatus 

 (Conrad), Spisula albaria (Conrad), Solemya ventricosta 

 Conrad, Tellina oregonensis Conrad, Thracia trapezoidea Con- 

 rad, Thyasira hisecta (Conrad), Crepidula praerupta Conrad, 

 Eudolium petrosum (Conrad), Miopleiona indurata (Conrad), 

 Turcicula zmshingtouiana Dall and Turritclla hlakelcyensis 

 Weaver. Such species as Acila gettysburgensis Reagan, Sole- 

 mya ventricosta Conrad, Eudolium petrosum (Conrad) and 

 Turcicula washingtoniana Dall appear for the first time in 

 this zone. They are always among the most common species 

 met with and are entirely absent from the Turritella porter- 

 ensis and Molopophorus lincolnensis zones. 



ARCA MONTEREYANA ZONE 



The recognition of a fauna characteristic of the Area mon- 

 tereyana zone was first mentioned as occurring in Wahkia- 

 kum County on the Alockaman River about 12 miles north of 

 the town of Cathlamet. The strata are composed of sandstones 

 and shales involved in a shallow synclinal trough. Deposits 

 of sandstones and sandy shales outcropping along the Strait 

 of Juan de Fuca from Pysht westerly to Clallam Bay, also 

 contain a fauna belonging to this faunal zone. Similar faunas 

 representing both deep and shallow water phases occur in the 

 shales and sandstones in the Grays Harbor region. The sedi- 

 ments in which they occur were in part formerly referred to 

 by the writer as the Chehalis formation." 



A complete list of the species occurring within this zone 

 may be referred to in the faunal table on page 35. Among 



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



