THE TOPOGRAPHY OF CALIFORNIA 565 
called the Cascade and the Lava Sheet mountains. The moun- 
tains next in importance to the Sierra Nevada are the Coast 
Ranges, which have an average elevation of about 4000 feet, a 
RELIEF MAP 
CALIFORNIA 
ny 
GEOLOGICAL DEPARTMEN™ 
STANFORD UNIVERSITY, CALIFORNIA 
width of 50 to 100 miles, and with the exception of a break at 
San Francisco Bay, extend along the coast for the full length of 
the state. The Coast Ranges, however, are more or less broken 
at a number of places, thus giving rise to rather distinct groups 
of mountains which have received special names. The southern 
