268 University of California Publications in Geology [Vol. 7 



It is not probable that the peculiarities of this fauna are due 

 to climate, as the fauna of the type Tejon is also tropical or sub- 

 tropical. The great variety of genera, and the great abundance 

 of forms at most localities of the Tejon indicate life conditions 

 such as are generally found in tropical or subtropical seas. 



The widespread geographic distribution of certain species char- 

 acteristic of the Tejon is especially noteworthy. Cardita plani- 

 costa is nearly world-wide, Meretrix hornii, Tapes conradiana, 

 Dentalium stramineum, Perissolax blaltei, and many others 

 range from Washington to San Diego at least. C. E. Weaver's 

 collections from the Eocene of AA T ashington, the California Acad- 

 emy of Sciences' collection made by Martin in Oregon, and the 

 Tejon collections show a great number of species common to all 

 three localities and the writer infers from this that unusually 

 uniform conditions of climate prevailed along the coast. 



When the fauna from the Eocene of Eastern Oregon listed m 

 the description of Turritella merriami, n.sp. (p. 287), is compared 

 with that of the typical Tejon the difference is seen to be very 

 slight. But few new species are found there, although the 

 locality is several hundred miles distant. A Tejon fauna from 

 San Diego collected by Mr. Wm. Kew does not show a great 

 number of species different from those of Mt. Diablo region. 

 Several species which were first known only from San Diego 

 have since been recognized in the Tejon of the Mt. Diablo region. 

 Geographic separation is thus seen to be insufficient to account 

 for the great difference between the Tejon of Fort Tejon and the 

 Marysville Buttes Eocene. 



Geography of the Tejon Sea 



Extensive Eocene deposits occur along the coast of Oregon 

 and Washington as well as a considerable distance inland. Eocene 

 deposits are found in Southern Oregon but no Eocene has been 

 reported from the Klamath Mountains. That most of the Eocene 

 of Oregon and Washington is Tejon can not be questioned if a 

 careful study of the fauna is made. Form after form is seen 

 to be identical beyond a doubt with those of the Tejon, although, 

 as one might expect, there are many species which are new. Com- 



