Mount Thielsen
Videos
Mount Thielsen, 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, c
Mount Thielsen's eroded edifice from the Pacific Crest Trail
Mount Thielsen seen from the south in the 1930s
The Juan de Fuca Plate is being subducted under the North American Plate, generating gradual, diverse volcanism.
Aerial view of Mount Thielsen
Mount Bailey (Oregon)
Videos
Mount Bailey is a relatively young tephra cone and shield volcano in the Cascade Range, located on the opposite side of Diamond Lake from Mount Thielsen in southern Oregon, United States. Bailey consi
Mount Thielsen
…Mount Thielsen (Klamath: hisc’akwaleeʔas), 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…
Mount Bailey from Diamond Lake