Vot. IIT] ANDERSON—FURTHER STRATIGRAPHIC STUDY bu 
their strata are mutually conformable and no clear evidence 
can now be offered to the contrary, it is not impossible that 
such evidence may be found when the fresh-water series shall 
become better known. 
Deposits of Pleistocene age, in the form of alluvial gravels 
and other superficial and unstratified accumulations, rest un- 
conformably upon strata of all of the older series, including 
those of the Tulare, signifying that a long period of denuda- 
tion intervened between the latter and the late Pleistocene. 
CORRELATIONS 
The minor provinces or basins of the Pacific Coast Tertiary 
deposits have not yet been delimited, and the final correlation 
of strata studied in different parts of the coast region must 
await a fuller knowledge of geographical conditions. Even 
within the limits of California, provincial differences are ap- 
parent, and there is a liability to error unless a degree of 
caution is observed; still within limits some correlation is 
safe and desirable. 
In the Salinas valley, Tertiary strata are known which can 
be satisfactorily compared with those of the Mount Diablo 
range; but in the Coast ranges to the west of the Salinas, 
bordering on the open sea, it is quite likely that both sedimen- 
tation and biological conditions were different. 
Thus far the stratigraphy of the Eocene is only imperfectly 
known and has been less studied in the outer ranges than in 
the Mount Diablo range. Dr. Ralph Arnold’ has given a 
brief and comprehensive sketch of the Eocene occurrences of 
the Coast, in which he has endeavored to recognize in each 
the various subdivisions as thus far described. In its more 
characteristic and better known portion, namely the Tejon, 
such an attempt is certain to be more successful and satisfac- 
tory than in other portions. The Tejon beds occurring in 
the Mount Diablo range are correlated with similar occur- 
rences in all parts of the Coast, including Washington, Oregon, 
1U. S. Geol. Surv. Prof. paper, no. 47, pp. 10-17. 
