The Geology and Petrography of Crater Lake National Park, 1902
LIMITS OF THE CASCADE RANGE.
The western limit of the great volcanic field is likewise the western border of the Cascade Range, which is made up at least largely, if not wholly, of volcanic material erupted from a belt of vents extending from northern California to central Washington. Lassen Peak marks the southern end of the Cascade Range, and Mount Rainier is near the northern end. Beyond these peaks the older rocks rise from beneath the range and form prominent mountains, the range itself occupying a depression in these older terranes.
Fig. 1.—MAP SHOWING ROUTES TO CRATER LAKE.
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