| This zoomed in view shows Mount Scott on the right. Sentinel
Rock is in the middle, and the massive cliff of Skull Rock is on the right.
Mount Mazama began to form about a million years ago. Theeastern half of Mount Mazama is built on older flows and domes that form 600,000 to 700,000 years ago (Bacon, 1990). The great volcano
was part of a complex volcanic area consisting of shields (volcanoes built
up of lava flows), cinder cones (volcanoes built up of ash and cinder),
and stratovolcanoes (the combination of intermittent layers of lava flows and
ash and cinder deposits). Lava and ash erupted from numberous vents at different
times, but the result was the buildup of a great mountainous volcano, similar
to other great volcanoes in the Cascade Range. |
