376 The American Geologist. June, 1895 
from the Sierra Nevada was found by Dr. Lorenzo Yates on 
Dr}" creek, Stanislaus county, but in this case also the kind 
of material is not indicated, so that without fuller information 
these specimens are not of much value for determining the 
age of the Auriferous gravels. A locality that promises much 
was discovered by C. U. Voy* "on a nameless dry creek trib- 
utary to Bear creek, in Mercedf county, near the line of Mar- 
iposa, about six miles southwest of Indian Gulch. The rocks 
at this place consist of a coarse, friable, light colored volcanic 
ash, which envelopes a large quantity of bones, and also con- 
tains the remains of vegetation, and especially the casts of 
some small fruit or seed vessel, the relations of which have 
not been made out." 
In a paper on the geology of mount Diablo;]; the writer 
called attention to the Kirker pass fossil locality where there 
are leaf-beds with fossil wood, associated with beds containing 
marine shells which have been referred to the Pliocene. Ande- 
site-tuffs form part of the same series. A large collection 
should be made of all of these fossils, for here we have in the 
marine shells a check on the value of plant remains for the 
determination of the Tertiary deposits of California. 
It is suggested in the bulletin on mount Diablo that the 
beds at Corral Hollow are of the same age as those at Kirker 
pass, and inasmuch as the marine shells at the latter locality 
are pretty certainly Pliocene, it was believed that the Corral 
Hollow series must also be Pliocene. The correlation of the 
beds at the two localities was made on the basis of similar 
volcanic deposits (andesitic tuff and conglomerate) occurring 
at both places. On referring to his note-book the writer finds 
a section representing the Corral Hollow plant beds, which 
are composed of fine whitish material, resting on a series con- 
taining fossil oysters, and overlain with apparent conformity 
by the volcanic conglomerate beds. Another visit to the local- 
ity will therefore be necessary to determine whether or not 
the plant beds are older than the andesitic materials. 
The andesitic tuffs at Kirker pass, however, also overlie the 
*Aurifei'ous Gravels, Whitney, p. 247-248. 
fThis part of Merced county is now called Madera county. 
tBull. Geol. Soc. Am., vol. ii. pp. 396-397. 
