Coast Ranges of California. — Turner and Stanton. 93 
in Tertiary deposits," in which he showed that there is con- 
siderable doubt as to some species given in Gabb's list being 
found in both the Chico and the Tejon formations. Mr. G. 
F. Becker* confirmed the work of Whitney and Gabb, as did 
also later Dr. C A. White. However, neither Mr. Becker's 
party nor Dr. White found any fossils common to the two 
formations. Lately Mr. .1. S. Diller and Mr. Stanton have 
found evidence of the unconformity of the Tejon on the Chico 
in Oregon and northern California. A doubt therefore arises 
as to whether the conformity of the Chico and the Tejon in 
central California is real or only apparent. 
The most important paper supporting the position of Dr. 
Gabb is that by Dr. C. A. White. \ The locality visited by 
Dr. White, where the conformity seems best shown is New 
Idria, in Fresno county, concerning which he writes as follows ; 
Although this New Idria series is understood to be practically an un- 
broken Din', there is near its middle a recognizable change in the aspect 
of the strata, so that * * * * the upper half differs from the lower 
half, [t is upon this indistinctly definable horizon that Dr. Becker di- 
vided the series into t wo groups, for i lie purpose of arranging the results 
of his studies id' them. So far as can he determined, this indistinct line 
accords with the necessarily artificial division that has been made of 
the series into the Chico and the Tejon groups, since this series is rec- 
ognized as containing only these two groups, and the line of demarca- 
tion between them, as before shown, cannot be expected to he distinct. 
Fossils were collected by Dr. Keeker's parts- from various horizons in 
the series, hut in a large portion of it none were found, and those from 
the lower or Chico portion are very few. These latter, however, are of 
characteristic types, being species of Ammonites, Baeulites, Trigonia, 
Tnoceram'us, and Limn. It is proper to mention thai in this New Idria 
series of st rata no commingling of t he < Iretaceous species above referred 
to with Tertiary tj'pes of fossils was actuallj observed; but verj Few 
fossils of any kind were obtained al I his locality, especially in the lower 
portion of the series. Still the intimate relation of the Chico and T6- 
jon groups for this particular locality is well shown by the unbroken 
character of the series of -t rata which here constitutes both groups. 
The Chico strata at New Idria. as measured on the ridge 
west of San Carlos creek, have an average dip J of aboul 15°- 
*Bull. V . s. Geol. Survey, No. 19. 
Il'.ull. V . s. Ceoi. Survey, No. 15. 
I'l'he Chico beds in this section near the contact with the metamor- 
phic rocks to the south dip at high angles varj ing from GO -90 . and i he 
dip gradually becomes less going north, awa^ from the metamorphic 
area and upward in the geological horizon. Near the contacl with the 
Tejon sandstones t he dip is 30 
