Geol.— Vol. II.] AXDERSON—STRATIGRAPHIC STUDY I9I 



of the Kern River Beds on the southeastern border of the 

 San Joaquin Valley. 



7. The most complete and typical development of the 

 San Pablo strata is not found in the locality from which it 

 takes its name, but along the northeastern flanks of the Mount 

 Diablo Range, as in western Fresno County, where the series 

 attains more than four times the thickness stated in its original 

 description. 



8. The Etchegoin series is capable of being subdivided, 

 at least locally, into two or more separate members, each of 

 which has a greater stratigraphic thickness than was origin- 

 ally given for the entire body of similar beds occurring on 

 San Pablo Bay, which are altogether embraced in the lower 

 division, the Etchegoin Sands. 



9. The uppermost stratigraphic unit of the Mount Diablo 

 Range is one of fresh-water origin, and is perhaps equivalent 

 to the Orindan Formation of the Berkeley Hills, as described 

 bv Dr. Lawson. 



10. The Neocene faunas of California are far from being 

 completely known ; thev offer a rich field for study, and it is 

 believed that such study would yield results of great value to 

 students of stratigraphic geology. 



Descriptions of Species. 



Amons: the manv fossils collected in the Mount Diablo 

 Range and the California interior during the field-study 

 represented in the foregoing paper, many new species have 

 been discovered, some of which are here described. 



While undescribed forms have been obtained from both 

 Cretaceous and Tertiary strata, the latter only are illustrated 

 in the following pages. The list of new forms from each of 

 the Tertiarv horizons might be considerably extended b}^ the 

 use of fragmentary and imperfect materials, but the descrip- 

 tion of such material is not only unsatisfactory but results in 

 much harm to paleontologic science. 



]Many of the California Tertiary invertebrates were origin- 

 ally described in literature that has become inaccessible, and 



