160 BRUCE CLARK 
not be sufficient as it is impossible to trace the beds by mapping 
from any one of these general localities to another. 
The stratigraphic evidence shows that in all the localities 
which have been examined, the Mount Diablo, Coalinga, and the 
Simi Hills regions, an unconformity exists between beds containing 
a typical Tejon fauna and others containing a fauna which is very 
different from that of the typical Upper Eocene, and also very 
different from that of the Martinez (Lower Eocene). As has 
been pointed out these general unconformities are not the result 
of local crustal movements, and surely cannot be classed as being 
“‘at most secondary order, i.e., such as might separate two forma- 
tions within a group.”* The beds below the upper unconformity 
are not Martinez in age, as shown by the fact that in the Mount 
Diablo region the Meganos beds rest unconformably on the Mar- 
tinez. It is not possible at this time to present all the faunal 
evidence for correlating the different sections of the Meganos of 
the Coast ranges, as a large percentage of the species from this 
horizon are new and have not been described. The following 
discussion is based on described species only. 
The best faunal evidence for correlating the Meganos of the 
Mount Diablo region with that of the Coalinga region is that 
presented by the corals. Three described species of corals are 
common to these two general sections; these are Turbinolia 
pusillantma Nomland, Turbinolia dickersont Nomland, and Tro- 
chocyathus imperialis Nomland2 It has already been pointed 
out that Dickerson correlated the beds in the Coalinga region, 
which are here referred to the Meganos epoch of deposition, with 
those of his Turbinolia zone as recognized in the Eocene section 
« R. E. Dickerson, “Stratigraphy and Fauna of the Tejon Eocene of California,”’ 
Univ. Cal. Pub. Bull. Dept. Geol., Vol. TX (1916), No. 17, p. 420. 
2 J. O. Nomland, ‘‘Corals from the Cretaceous and Tertiary of California and 
Oregon,” Univ. Cal. Pub. Bull. Dept. Geol., Vol. TX (1916), No. 5, pp. 59-76, Pls. 3-6. 
Dr. Nomland listed Turbinolia dickersoni as being present in the Tejon of the 
Coalinga region; the type, however, came from the Meganos of this same section. 
Later examinations by Nomland of the specimens from the Tejon of this region, 
determined by him as T. dickersoni, show that this determination was a wrong one 
and that the form from this horizon is apparently a new species.—R. E. Dickerson, 
Univ. Cal. Pub. Bull. Dept. Geol., Vol. TX (1916), No. 17, pp. 427-28. 
