Mount Bailey, a volcano in Oregon’s southern Cascades across Diamond Lake from Mount Thielsen, is a relatively young tephra cone and shield volcano whose present form is thought to be no more than 100,000 years old. Built as a 2,000-foot main cone atop an older basaltic-andesite shield, it reflects a geologic shift from basaltic-andesite eruptions to andesite and is now inactive. The mountain also holds deep cultural importance in Klamath tradition as Youxlokes, or Medicine Mountain, a ceremonial summit reached by Native Americans for feasts and prayer vigils. Later renamed in 1992 for Vernon and Florence Bailey, it is also a well-known recreation destination for skiing and hiking.