352 Whitney’s Geology of California. 
sy 
seven of which states and territories lie entirely on the west of 
the Rocky Mountains; a chain about which so much has been 
written and yet so little accurately known previous to the pub- 
lication of this Report, we turn therefore with special pleasure to 
the facts here published. ae 
As stated respecting the chain, in the last number of this 
Journal, it has the direction N. 81° W., from Mt. San Jacinto to 
says, ‘‘we consider all those chains or ranges of , 
belong to,the Coast Ranges, which have been uplifted since et 
reckoned as belonging to the Sierra Nevada.” 
ing al 
around like a grand amphitheater, we pass suddenly from the 
undisturbed Tertiary to vodka of the fens age and waite highly 
so doing, we pass from the Sierra Nevada 
the Coast Ranges, although the chains form a perfect topograph- 
ical junction. And, again, at the northern end of the valley, in 
-somg county, . reba: “psp lying to the east of Sacra- 
mento river are horizonta i ; are 
hiwhly! disvarbed. » While on the western side they 
These horizontal strata may be traced at intervals for over 
400 miles, forming a narrow belt at the western base of the 
