MT. SHASTA
Mt. Shasta is a stratovolcano (composite volcano) of
the Cascade Range, located in northern California, USA. The Cascade Range
volcanoes stretch from northern California, through Oregon & Washington
State, to southwestern British Columbia.
Mt. Shasta has a distinctive double-hump to its
profile. The smaller cone on the left side of Mt. Shasta is called
Shastina. The Shasta-Shastina volcano is composed principally of
andesites and dacites, typical for subduction zone stratovolcanoes. The Shastina
cone is reported to be near-earliest Holocene in age (~9.4-9.7 ky).
A little west of Mt. Shasta is a large, slightly
reddish-colored, steep-sided cone called (oddly) Black Butte. Its lavas
are composed of dacites. This volcano's first eruptions were in the
near-earliest Holocene (~9.5 ky).
Above & below: satellite photo provided by Europa Technologies & Google Earth.
