| Mount Thielsen | |
|---|---|
 Mount Thielsen's eroded edifice from the Pacific Crest Trail | |
| Highest point | |
| Elevation | 9,184 ft (2,799 m) NAVD 88[1] |
| Prominence | 3,342 ft (1,019 m)[2] |
| Listing | Oregon county high points |
| Coordinates | 43°09′10″N 122°03′59″W / 43.152837292°N 122.066514283°W[1] |
| Geography | |
  Mount Thielsen Location in Oregon | |
| Location |
|
| Parent range | Cascades |
| Topo map | USGS Mount Thielsen |
| Geology | |
| Age of rock | About 290,000 years |
| Mountain type | Shield volcano |
| Volcanic arc | Cascade Volcanic Arc |
| Climbing | |
| First ascent | 1883 by E.E. Hayden[3] |
| Easiest route | Scramble |
Mount Thielsen (Klamath: hisc’akwaleeʔas),[4] is an extinct shield volcano in the Oregon High Cascades, near Mount Bailey. Because eruptive activity ceased 250,000 years ago, glaciers have heavily eroded the volcano's structure, creating precipitous slopes and a horn-like peak. The spire-like shape of Thielsen attracts lightning strikes and creates fulgurite, an unusual mineral. The prominent horn forms a centerpiece for the Mount Thielsen Wilderness, a reserve for recreational activities such as skiing and hiking. Thielsen is one of Oregon's Matterhorns.
Thielsen was produced by subduction of the Juan de Fuca Plate under the North American Plate.[5] Volcanism near the Cascades dates back to 55 million years ago (mya), and extends from British Columbia to California. Thielsen is part of the High Cascades, a branch of the main Cascades range that includes several Oregon volcanoes less than 3.5 million years old; it is also a member of a group of extinct volcanoes distinguished by their sharp peaks.
The area surrounding the volcano was originally inhabited by Klamath Native Americans, and was later encountered by settlers. One of the visitors was Jon Hurlburt, an early explorer of the area who named the volcano after the engineer Hans Thielsen. Later explorers discovered nearby Crater Lake. The volcano was not analyzed until 1884, when a team from the United States Geological Survey sampled its fulgurite deposits.
- ^ a b "Mt Thielsen". NGS Data Sheet. National Geodetic Survey, National Oceanic and Atmospheric Administration, United States Department of Commerce. Retrieved November 17, 2008.
- ^ a b "Mount Thielsen, Oregon". Peakbagger.com. Retrieved April 2, 2008.
- ^ Andalkar, Amar (January 15, 2003). "Mount Thielsen". SkiMountaineer.com. Archived from the original on March 16, 2009. Retrieved March 29, 2009.
- ^ "Klamath Tribes Language Project". The Klamath Tribes. 2012. Archived from the original on August 20, 2013. Retrieved March 21, 2016.
- ^ Topinka, Lyn (December 15, 2004). "Cascade Range Volcanoes and Volcanics". Description. United States Geological Survey. Archived from the original on September 3, 2013.