V. Geological and
Biological Information on Crater Lake Area
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E. Points of Geological Interest
in Crater Lake National Park
4. Hillman Peak
The highest point on the rim, at 8,156 feet
elevation, Hillman Peak was formed as a parasitic cone when a vent opened on the
side of Mount Mazama. The collapse of the parent peak cut Hillman in half,
exposing its inner structure. Its spires are ancient feeder tubes for the lava
that built the cone and were decomposed and tinted yellowish-orange by the gases
and other hot liquids that rose through them.
