THE MARINE TERTIARY OF THE WEST COAST 505 
near the town of Vader in southern Washington. This collection 
came from beds unconformable on the Tejon, and below strata 
containing a typical Molopophorus lincolnensis fauna. The fauna 
was aescribed by Dr. R. E. Dickerson and consisted of forty-eight 
species, of which thirty-six were considered new and thirteen were 
determined as common to the Molopophorus fauna.t The writer 
has had the opportunity of making larger collections from the 
Greise Ranch locality, and with Dr. G. D. Hanna, present curator 
of the department of paleontology of the California Academy of 
Sciences, has re-worked the fauna listed and described by Dr. 
Dickerson. ‘The results of this work show quite conclusively that 
there is very little, if anything, in common between this fauna 
and that of the Molopophorus lincolnensis zone. The fauna at the 
present time consists of about seventy-five species and is very 
distinct from any other known fauna on the Pacific Coast. None 
of these species have been definitely determined as common to 
either the Tejon or the Molopophorus lincolnensis zone, and the 
stratigraphic position of the horizon renders it possible that these 
beds are equivalent to the Jackson of the Gulf province. 
MIOCENE 
The marine Miocene of the West Coast is divisible, both on the 
basis of stratigraphy and fauna, into two major series each of 
which contains minor horizons. 
The portion of the geological section referable to the Monterey 
series (Lower-Middle Miocene) contains two fairly distinct faunas 
and two epochs of deposition, at least in certain areas of the state of 
California. The lower of these two divisions is the Vaqueros 
group, sometimes referred to as the “Turritella inezana”’ zone. 
The upper division of the Monterey series is herein referred to as 
the Temblor group and is represented by the fauna of the “Turri- 
tella ocoyana”’ zone. The deposits of the Vaqueros Sea covered a 
much more limited area than those of the Temblor, and have not 
been found in Oregon or Washington. 
tR. E. Dickerson, ‘‘Climate and Its Influence upon the Oligocene Faunas of the 
Pacific Coast with Descriptions of Some New Species from the Molopophorus Lin- 
colnensis Zone.” Proc. Cal. Acad. Sci., Fourth Series, Vol. VII (1917), No. 6, pp. 
157-92. 
