82 The American Geologist. February, i8y$ 
of disturbance are so closei}' connected with eacli otlier in direc- 
tion, and they have been so affected in this vicinity by the ex- 
istence of secondary ones, that the topography of the country 
does not reveal tlie geological facts, which not the less do really 
exist. 
•'Starting from a point a little to the east of the Canada de las 
Uvas, and drawing a line which shall leave on the west all the 
mountains elevated since the deposition of the Cretaceous, and 
on the east those which have not been disturbed since that epoch, 
we find that, according to our present state of knowledge, this 
line will pass to the east of the San Gabriel range, through the 
Tejon pass, to the east of the Temescal range and on the south 
of the Santa Ana, striking the ocean in the vicinity of San Luis 
Raj', which is the most southerly point to which the Coast range 
sj'stem has been traced. The masses of San Bernadino and San 
Jacinto are included in the Sierra Nevada, which runs south and 
occupies the peninsula of lower California, the Coast range s\'s- 
tem not having an existence in that region.'' * 
To Blake is due then the credit of having first announced the in- 
timate relation existing between the Coast system and the Sierras, 
but it is evident that he is wrong in the conclusion reached with 
reo-ard to the relative ages of the two. 
In discussing Prof. Whitney's statements I wish to show how 
artificial is his line separating the two systems of ranges. In the 
first place the change from undisturbed to steeply inclined Ter- 
tiary Vjeds near Fort Tejon, indicates simply the- point to which 
the effects of an important uplift of the Coast ranges in post 
Miocene times extended. This uplift was not felt to any extent 
in the Sierra Nevadas, and the fact remains as indisputalile that 
the granites and crystalline schists of the Sierras extend un- 
broken through the Tehachapai and San Emidio ranges. The 
granites and schists of the San Gabriel range also extend un- 
broken through the Cajon pass to the San Bernadino range, and 
this is separated from the San Jacinto by the San Gorgonio pass, 
which 1 believe represent no structural separation. The granites 
and metamorphic rocks of the Santa Ana mountains I have also 
demonstrated to be continuous with those of the Peninsula 
range. 
It seems to me that the geologists who have studied this sec- 
* Geology of Cal., Vol. i, page 167. 
