40 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4TH Ser. 
south, while in the Salinas valley and elsewhere beds that have 
been generally called San Pablo and otherwise correlated with 
it, are undoubtedly more closely related to the Coalinga. This 
is true of the Santa Margarita beds described by Fairbanks,’ 
which also occur at La Panza Springs, Nacimiento river, and 
on the Estrella and San Lorenzo creeks. The type locality of 
Ostrea titan, Tamiosoma gregaria, Pecten estrellanus, P. 
crassicardo, and many other species described by Conrad, was 
the Estrella creek where Coalinga beds are abundantly fossil- 
iferous. It yet remains to be shown that these beds are prop- 
erly correlated with the San Pablo of the type localities, 
whereas the fauna of the Coalinga beds is unmistakable in 
them, as in the Santa Margarita beds. 
Above the Coalinga beds occurring on the San Juan creek 
west of the Carisa valley, there are 2000 feet or more of strata, 
among which the Etchegoin beds and likewise the San Pablo 
have their place. The equivalents of the Coalinga beds and 
of the Etchegoin, which doubtless occur in other parts of the 
Great valley, have not yet been clearly recognized. The classi- 
fication of the Tulare beds as late Pliocene and their relation 
to the Merced and Paso Robles formations have already been 
mentioned. The angle at which the Tulare beds stand in 
most of their outcrops is evidence of a post-Tulare uplift. It 
is not unlikely that, when all these formations are better 
known, it will be found that during the Tulare epoch the 
Kern-Tulare basin had a more direct relation to the Paso 
Robles and Merced deposits than that of synchronism. 
It would be interesting to trace here the long history of 
crustal movements as they are illustrated in the Mount Diablo 
range; but that topic, along with many other interesting 
features of structure that can not now be taken up, must be 
reserved for future consideration. 
21U. S. Geol. Surv. Pub. San Luis folio, no. 101, p. 5-6. 
CALIFORNIA ACADEMY OF SCIENCES, 
March 16, 1908. 
