Mt. Thielsen is another one of the Cascade peaks that has been inactive for a long time- in this case, about a quarter million years- and has been heavily incised by glacial erosion, leaving little more than a horn. For some reason that's not clear, the peak attracts lightning strikes more than similar peaks, and its summit is supposedly entirely polished to glass. Lightning-created glass is also known as fulgarite. As a result, Thielsen is known as the "lightning rod of the Cascades." Another bit of trivia: this is the southern-most Cascade peak I've been able to spot from Marys Peak. That was just one time, in the early-mid 1980's, when I got up there during a winter inversion. Inversions keep most of the human pollution down on the valley floor, but higher elevation air is crystal clear.
Photo unmodified. August 18, 2011. FlashEarth location.
Is This Your Hat?
10 years ago
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