Falls Trail Stop 18

Falls Trail Stop 18
The talus slope is formed primarily of debris from lava flows and maar deposits

NPS Photo by Stella Carroll

The talus slope to your right is formed primarily of debris from lava flows and maar deposits. As the basalt lava solidifies cooling cracks develop. These fractures are known as columnar joints. The cracks form block-sized hunks of basalt that eventually tumble downslope forming the talus. This particular rockfall, as documented by historic photographs, happened in 1942.

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Last updated: February 24, 2015

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