252 T. W. STANTON — SHASTA AND CHICO FAUNAS. 



Localities at Gas Point post office and on Roaring river, not far dis- 

 tant, yielded the following: 



Ammonites chicoensis, Trask. 



Turriteila seriaMm-granulata, Gabb, not Koemer. 



Nucula truncata, Gabb. 



On the Cold fork of Cottonwood creek the following collection was 

 obtained : 



Bacidites chicoensis, Trask. Cucullsea truncata, Gabb. 



Belemnites impressus, Gabb. Pecten traskii, " (?) 



Neptunea hoffmanni, " Ostrea. 



Nucula truncata, " Terebratetta obesd, " 



Two of these species are common to Horsetown and Texas springs. 



Going a few miles farther southward, the first important localities are 

 on Elder creek, on the line of one of Mr Diller's measured sections. Near 

 Lowry's and at other places farther westward specimens of Aucella piochii, 

 Cod))), were obtained, while a higher horizon about two miles east of 

 Lowry's yielded the following species : 



Gyrodes excavata (Mi chelin), Whit- Venus lenticularis, Gabb. 



eaves. Tellina parilis, " 



Lunatia. Tellina ashburneri, '' 



Anchura californica, Gabb. Cucullcea truncata, " 



Dentalium stramintum, " Astarte conradiana, " (?) 



Thetis annulata, ■ " Pecten operculiformis, " 



Chione various, " Avicula. 



This lot shows a greater difference than any of the others, although it 

 contains at least four species enumerated from other localities above 

 given. 



Sufficient evidence has therefore been presented to show that all the 

 species from the several localities mentioned very probably belong to 

 one fauna. 



Near Redding, on Sacramento river, a large number of species were 

 collected, many of which were not obtained at any of the above localities, 

 but the presence there of such forms as Cucullsea truncata, Trigonia evan- 

 sana, Pecten operculiformis, Corbula traskii, etc, make it probable that the 

 beds belong to the same continuous series, though they may represent a 

 somewhat higher horizon. 



Collections from several localities in Oregon that have always been 

 referred to the Chico formation, such as Crooked river. Siskiyou moun- 



