10 Facts About Mount Bachelor

Mount Bachelor, formerly named Bachelor Butte, is a dormant stratovolcano atop a shield volcano in the Cascade Volcanic Arc and the Cascade Range of central Oregon.

Mount Bachelor joins several other volcanoes in the eastern segment of the Cascade Range known as the High Cascades, which trends north–south.

Mount Bachelor is the youngest prominent volcano in the Three Sisters area of Oregon, a group of closely grouped volcanic peaks, in contrast to the typical 40-to-60-mile spacing between volcanoes elsewhere in the Cascades.

Mount Bachelor is composed of basalt and basaltic andesite, and though its upper volcanic cone formed after its base shield, the two edifices show similar eruptive composition.

Mount Bachelor is associated with a number of pyroclastic cones and shield volcanoes.

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Shield volcanoes within the vicinity of Bachelor include Sheridan Mountain, Lookout Mountain, and Kwohl Butte.

Mount Bachelor Chain has shown activity during the Pleistocene and the Holocene, mostly consisting of effusive eruptions with a small number of explosive eruptions yielding agglutinate spatter cones, volcanic bombs, and scoria.

Mount Bachelor is so called because it "stands apart" from the Three Sisters, a group of three volcanic mountains that are northwest of Mount Bachelor.

In early days Bachelor Butte was frequently called "Brother Jonathan", or "Mount Brother", but both eventually fell out of use.

Over time the popularity of the ski area led to the name Mount Bachelor coming into popular usage, and in a divided decision, the Oregon Geographic Names Board voted to change the name from Bachelor Butte to Mount Bachelor.