ED CALIFORNIA ACADEMY OF SCIENCES [Proc. 47H Ser. 
hand to establish its position in the stratigraphic scale, but it 
is supposed to be the continuation of the Monterey shales oc- 
curring north of Temblor. In the range west of Midway and 
to the south of Sunset they have an aggregate thickness of 
nearly 5000 feet and contain the usual lithologic peculiarities 
of the Monterey. As the Temblor beds are known to occur 
at San Emidio, there is a presumption in favor of these shales 
being properly the Monterey. To the south of the Temblor 
valley the structure of the Miocene rocks is that of a high 
anticlinal fold along the axis of the range, with a steep dip 
toward the Carisa valley and, near Sunset, toward the south. 
This anticline disappears in the vicinity of the San Emidio 
canyon. 
The Coalinga Beds.—The uppermost member of the Mio- 
cene series is best characterized and most easily followed 
along the base of the hills north of Coalinga, but it attains its 
greatest stratigraphic development to the south and east of 
the Warthan creek. In the former paper, on account of its 
thickness and more varied fauna in the Warthan creek locali- 
ties, it was made to include more strata farther north than 
should have been included. It is now proposed to restrict the 
name Coalinga beds to the lower portion of a series that is 
unconformably related to the older members of the Miocene. 
In the vicinity of Coalinga there are two somewhat different 
types of this formation occurring in the localities mentioned. 
As here restricted, the Coalinga beds contain from 500 to 800 
feet of strata at the north—that is, between Coalinga and the 
Cantua creek, and from 1000 to 1500 feet in the field between 
the Warthan creek and Tulare lake. 
These differences are due primarily to the conditions of 
deposition during the latter part of the Miocene period. Along 
the hills north of Coalinga this series begins with a basal con- 
glomerate varying in thickness from 15 to 50 feet or more, 
and consisting of coarse pebbles and boulders often ranging 
in weight up to several hundred pounds. At Salt creek and 
northward to the Cantua, the weathering and faulting of this 
conglomerate has produced the effect of enormous thickness, 
which is deceptive. In many places, as north of the Cantua, 
