238 
The American Geologist. 
April. 1894 
( )\ therea longa (< !abb). 
Tellina ashburneri < rABB. 
Tellina ooides < !abb. 
Tellina n. sp. 
[Ail raria i runcata < Iabb. 
Mactra (Cymbophora) ashburneri 
Gabb. 
Mad ra n. sp. 
Pholadomya breweri < rABB. 
Martesia clausa ( cabb. 
Dentalium cooperi ( rABB. 
Dentalium straminenm Gabb. 
( ryrodes expansa < Iabb. 
Anchura falciformis ( rABB. 
Turritella veatchi ( {abb. 
Mesalia obsuta White. 
Potamides tenuis • rABB. 
( Vratia nexilia White. 
Faunus marcidulus White. Type 
of species. 
Rostellites gabbi (White). Fig- 
ured specimen, 
Eripachya ponderosa Gabb. 
Perissolax brevirostris Gabb. 
Fusus averilli ( rABB. 
Actsjon sp. undet. 
Cylichna costata Gabb? 
Baculites chicoensis Tkask. 
Ammonites chicoensis Trask. 
Ammonites n. sp. 
"The fossils from these localities, like those from all the other 
( Iretaceous localities on the east side of the Sacramento valley, 
belong to the typical Chico fauna. The strata from which 
they came are probably not the oldest Chico beds, though sev- 
eral of the most prominent species range down to the base of 
the Chico and into the Horsetown beds in the thick sections 
on the west side of the Sacramento valley. On the other hand. 
these typical Chico strata from which the formation was first 
named seem not to represent the latest Cretaceous time: for 
their fossils do not show any intimate relationship with the 
fauna of the Tcjon (Eocene), which has been supposed to 
follow the Chico without interruption. This view is strength- 
ened by the fact that the fossils, especially the Ammonites, 
from the base of the Chico where it blends with the Horse- 
town indicate an age not later than the < Vnomanian for that 
portion of the formation." 
Tk.ion Formation (Eocene). 
So far as known, strata containing shells of the Tejon for- 
mation have been found in the Gold Belt region only at the 
Marysville buttes, where they were collected by Mr. Lindgren. 
Tejon fossils have not been reported from the foothills of the 
Sierra Nevada between the Marysville buttes and the original 
locality in the Tehachapi range, the Tejon ranch. 
At the west base of the north end of Oroville table mountain 
about one mile south of Pentz P. ().. the writer collected casts 
of ii strongly concentrically ribbed shell, associated with stems 
