ROCKS OF THE COAST RANGES OF CALIFORNIA 493 
of Mt. Diablo, in a ravine above the house of young Ben Dixen, 
fossils were found by Mr. F. M. Anderson, a student at the Uni- 
versity of California, to whom I am indebted for the informa- 
tion. In company with Dr. Merriam, I visited this locality in 
1897. We found more fossils there in thin, shaly layers in the 
hardened sandstone of the Golden Gate formation in a ravine 
above the house. This ravine heads just northeast of the north 
peak, and has a northeasterly course to about the fossil locality, 
where it turns sharply to the east. We collected some lamel- 
libranchs here, which were not, however, specifically *determina- 
ble. The sandstone is much intersected with fractures and can 
be readily broken out. This locality will probably afford more 
material, if carefully worked. Dr. T. W. Stanton, who saw Mr. 
Anderson’s fossils, thought that the forms belonged to the 
Cyprinide or Veneride, but was unable to express a positive 
opinion concerning them. 
The San Pablo formation. — At Kirker Pass,’ north of the Mt. 
Diablo, south of the mountain at the Railroad Ranch reservoir, 
and at Corral Hollow, there are beds containing large amounts 
of volcanic detritus, as well as fossil shells and plant remains. 
The beds at Kirker Pass and Corral Hollow were first made 
known through the investigations of the State Geological Sur- 
vey, under Professor Whitney. At a later date I visited the 
three localities above named and collected fossil plant remains 
at all of them, and fossil shells at two of them. The plant 
remains were studied chiefly by Professor Lesquereux, who 
assigned some of them to the Pliocene and others to the Mio- 
cene. The fossil shells were examined by Dr. Dall, who con- 
sidered them to indicate a Pliocene age. Dr. Gabb had 
previously collected quite a series of fossil shells at Kirker Pass, 
and on that basis called the beds Pliocene. 
In October 1897, in company with Dr. J. C. Merriam, I again 
visited Kirker Pass, and we collected there fossil shells and 
«This pass is named after a Mr. Kirkwood, but the name Kirker having been 
used in geological literature for a long period, it is perhaps inadvisable to change the 
name to Kirkwood Pass. 
