Vor. III] ANDERSON—FURTHER STRATIGRAPHIC STUDY 39 
the basal member of the Neocene, he does not define its place. 
In his attempt to describe the fauna of the “Vaquero Sand- 
stone’ his materials were taken from a series of sandstones 
overlying the Stone canyon coal vein on the west slope of the 
Mount Diablo range. Stratigraphically and faunally it agrees 
with the Temblor beds, as was determined by the writer before 
Mr. Hamlin’s description appeared.* 
Most of the strata that have been described under the name 
“Vaquero Sandstone”, as far as known, represent a well char- 
acterized horizon of the Lower Miocene, and as such are 
without doubt to be correlated with the Temblor beds of the 
Mount Diablo range. 
The Monterey shales occurring in the Middle Miocene of 
California have generally been called by that name; hence 
little is to be said regarding their correlation with the same 
in the Mount Diablo range. In general, however, there is a 
tendency to trust too far to lithological characters in their 
identification, and it is not unlikely that error has thus origin- 
ated more than once in the application of this name. 
The San Pablo beds described by Dr. J. C. Merriam as oc- 
curring on San Pablo bay, have not yet been sufficiently well 
exploited to enable a close comparison to be made. The fos- 
sils contained in the published lists of the San Pablo bay and 
Kirker’s Pass localities are almost entirely those of the 
Etchegoin, rather than of the Coalinga. The species which 
chiefly characterize the lower series do not appear in the San 
Pablo as at present known, though it is quite possible that a 
greater resemblance will be found when both become better 
known. In the San Pablo at its type localities no mention is 
made of the abundant occurrence of Pecten, Ostrea, Tam- 
iosoma, Chione, Agasoma, V olutilithes, Chorus, Cancellaria, 
Turritella, etc. 
In the former paper the San Pablo, as known from its type 
localities, was correlated with the Etchegoin; and this seems 
to be its closest ally among the stratigraphic series farther 
* As for the name “Vaquero” and its application to any strata outside of the type 
locality, it has no logical standing, and its claim upon accepted usage rests only upon 
assumption. 
