Vor. III] ANDERSON—NEOCENE DEPOSITS OF KERN RIVER 99 
It is the horizon chiefly represented in the list of species pub- 
lished by the writer in 1905, and is also the horizon from 
which Dr. Cooper believed he had obtained many living 
species. Probably none, or only a few, of the species are 
actually living, though it must be admitted that the resemblance 
of many of them to living forms is more than superficial. 
Probably many of them are the lineal antecedents of forms 
now living along the Pacific coast. Zone B has a stratigraphic 
thickness of less than 150 feet, and may be generally taken as 
100 feet, though some of the species are found a little lower. 
Zone C is that exposed near the top of Round Mountain, 
two miles north of Barker’s ranch, and also in the hills west 
of Round Mountain, locally known as the Shark-Tooth Hills. 
It is the horizon from which most of the sharks’ teeth have 
been obtained, including those to which reference is made by 
Dr. Jordan.* 
This horizon can be followed across the field for many 
miles, and can usually be identified by its characteristic white 
marl, by its abundant sharks’ teeth, and by the fact that it 
forms the uppermost fossil horizon, and is overlain by the 
greenish-gray sands of the Kern River group. 
On the following pages are given lists of the more common 
or characteristic species of the three principal horizons of the 
' Kern River Neocene series. The fossils of Zone A were 
collected by W. H. Ochsner, A. G. Carpenter, and the writer 
from the south side of Pyramid Hill in 1909, 
List oF SPECIES 
: 4 : Miocene Fossil Zones 
Species from the Kern River section: Fae Eel a= 
Tp MMR TO ARC SUS ALIVE Wat OO RON CO AP RAY BS as 
ALCOLMONTEKEVANGIOSMONTY. 22) 52/5 cette Sh able sels oles wade ls x x 
Cardium waqueroense ARNOLD. 0... ¢.060. 00825002050 ss x 
Cyrena (Corbicula) dumblei ANDERSON................ a x 
Cytherea (Callista) mathewsoni GABB...............-- >< x 
ONACOTAD. SDs SBS SEO TS So OES RI estes x 
DD OSIM COPIEGINGIABDY Sethe coe walgreens alae x x 
Dosimiawzehmneye Gappe. 22 ue Vee ees ay Oe Pe x pe Se 
DEO OVA) Dac. WS 0 Oth tO Re TT Ot Re SEN XK 4 
eda OreS ONAN SEUIMARD) 2. co los. . Sale Nb eta tela nated x 
Macii ae Gey in alata CONS) ee).cc esd cs  ioesk tee satel SK 
Mactra (Spisula) (rel. M. falcata Gup)............... x 
LACEN GINS PBS TEE ie cts soe Chevols tw aleeatana agen XK 
Monlusimothewmsonin Gaps ..e ose. ee ae. x 
1 Bull. Dept. Geol. Univ. Cal., v. 3, pp. 95-144. 
